Audi e-tron Concept, 2008

The Audi e-tron Concept, a high-performance sports car with a purely electric drive system. Four motors - two each at the front and rear axles - drive the wheels, making the concept car a true quattro. Producing 230 kW (313 hp) and 4,500 Nm (3,319.03 lb-ft) of torque, the two-seater accelerates from 0 to 100 km/h (0 - 62.14 mph) in 4.8 seconds, and from 60 to 120 km/h (37.28 - 74.56 mph) in 4.1 seconds. The lithium-ion battery provides a truly useable energy content of 42.4 kilowatt hours to enable a range of approximately 248 kilometers.

The performance figures are by no means the only evidence of the consistent and holistic strategy. The design makes it clear that the Audi e-tron Concept belongs in the major leagues of sports cars, and the package takes into account the specific realities of an electric vehicle. The battery is directly behind the passenger cabin for an optimal center of gravity and axle load distribution.

The Audi e-tron Concept is able to freely distribute the powerful torque of its four electric motors to the wheels as required. This so-called torque vectoring allows for dazzling dynamics and an undreamed-of level of agility and precision when cornering.

A heat pump is used to efficiently warm up and heat the interior. The drive system, the power electronics and the battery are controlled by an innovative thermal management system that is a crucial component for achieving the car's range without compromising its high level of interior comfort. Networking the vehicle electronics with the surroundings, which is referred to as car-to-x communication, opens new dimensions for the optimization of efficiency, safety and convenience.
Audi e-tron Concept

The Concept

Electric drive systems are still very much outsiders. The first vehicles of this type took to the roads around 1900, yet in 2009 no volume car manufacturer has a car powered exclusively by batteries in its lineup. Fewer than 1,500 electric vehicles are currently registered in Germany, corresponding to only 0.035 percent of all registered vehicles.

Electric driving potentially offers numerous advantages. Electric cars reduce the dependence of transportation and the economy on the raw material petroleum. They produce no direct exhaust emissions and thus ease the local burden on the environment. Electric drive systems are also significantly more efficient than combustion engines, consequently making them easier on the customers' wallets. Other strengths include sportiness and the fun they bring to driving. All of the torque is essentially available the moment the driver steps on the accelerator, allowing for breathtaking acceleration.

There is still a lot of work to do before electric cars are ready for volume production, however. The greatest challenge is the integration of the energy storage system. Acceptable range and performance requires a traction battery that is heavy and takes up a lot of space. Audi is taking a new approach to offset these disadvantages - a holistic approach with a specific vehicle package, a systematic lightweight construction concept and an optimal configuration of all components for the electric drive.

Audi e-tron Concept - The Holistic Approach

The most important development related to batteries for electric drives are lithium-ion cells. Numerous experts throughout the world are working on their further development for use in cars, with the primary objectives being to reduce weight and increase capacity and performance. Audi has also opted for this technology, both for use in a hybrid production vehicle, such as the upcoming Q5 hybrid, and in the e-tron test platform.

The requirement specification for the concept vehicle goes far beyond battery technology and the replacement of the combustion engine with an electric drive system, however. The Audi development engineers decided back in the concept phase to design practically every component and technology based on the new requirements of electric mobility. The interaction of all elements has a decisive influence on the factors efficiency, range and practicality.

The Audi team therefore focused its attention on the total vehicle, which is reflected in the comprehensive requirement specification.

* The reduction of road resistances and the resulting increase in range plays a major role with electric vehicles. Lightweight construction was therefore a top priority for the Audi e-tron Concept car. The body, in particular, combines low weight with supreme strength and rigidity. An intelligent aerodynamics concept with active elements helps to reduce consumption.
* The package ensures the safe integration of the electric drive system and the battery. Placing the battery in front of the rear axle ensures an optimal axle load distribution without compromising the compact overall design and the generous amount of interior space.
* Advanced battery technology enables a practical range. The battery system is water-cooled for optimal performance and service life.
* A needs-based energy management system controls all functions for the chassis, convenience equipment and other auxiliary consumers.
* The innovative thermal management system with optimally matched cooling and heating components considers the cooling requirements of the battery and the drive system in addition to the interior temperature.
* Driving dynamics and road comfort are what Audi customers have come to expect in the sports car segment.
* Vehicle safety is on par with the best of today's production vehicles.
* The driver is provided with clear and comprehensive information.
* The Audi e-tron Concept car uses car-to-x communication technology developed by Audi to improve the efficiency of conventionally powered vehicles. For example, information about traffic light cycle times and the flow of traffic - provided by the infrastructure and other vehicles - is used to compute an optimal driving strategy. Audi has already modeled such a solution in Ingolstadt as part of its "travolution" project.

Design and Package

The caliber of the car is apparent to the observer at first glance. The Audi e-tron Concept has a wide, powerful stance on the road. The car body seems almost monolithic; the closed rear end appears powerful and muscular. The trapeze of the single-frame grille dominates the front end and is flanked by two large air intakes. The top of the grille merges into the flat strips of the adaptive matrix beam headlamp modules with their clear glass covers. High-efficiency LED technology is used for all lighting units - a matter of honor for Audi as the worldwide pioneer in this field.

The headlamps are the core of a fully automatic light assistance system that reacts flexibly to any situation. The new technology recognizes weather conditions and adapts the illumination to rain or fog. The technology at the heart of the light assistance system is a camera that works together with a fast computer to detect oncoming traffic, recognize lanes and measure visibilities, such as in the event of fog.

If there is oncoming traffic, for example, the high beams are turned off in the corresponding section of the illumination field. The cornering light system analyzes data from the navigation system and illuminates corners before the driver steers into them. The Audi e-tron Concept does not have conventional fog lamps that consume additional power. It instead intelligently varies the low beams to widen the illumination field, thus significantly reducing the glare from the car's own lights.

The variability of the headlamps is also reflected in their design. The LED elements change appearance and thus the character of the front end of the vehicle depending on the speed driven and the ambient conditions. The innovative lighting technology offers the Audi designers almost as much design freedom as the shape of the body does.

A new design element unique to the Audi e-tron Concept are the air intakes in the single-frame grille and in front of the rear wheel wells. They are closed flush under normal circumstances and opened by means of flaps when additional cooling air is required. Maximum efficiency is also the reason behind this measure. The concept car has a remarkably low drag coefficient, which gets even better when the flaps are closed.

The vehicle body is compact. The sweeping line of the front end and the flat curved roof immediately identify the two-seater as an Audi. The contours of the flanks are familiar. The tapering of the dynamic line above the sill and the shoulder line tie together the front end, the side and the rear, lend a plastic quality to the doors and the transition to the side air intake and sharply emphasize the Audi-typical round wheel wells with the large, 19-inch tires.

1.90 meters (74.80 in) wide, just 4.26 meters (167.72 in) long and 1.23 meters (48.43 in) tall - those are the proportions of a supercar. The wheelbase of 2.60 meters (102.36 in) leaves plenty of room between the axles for people and technology. Like with a mid-engined sports car, the cabin of the Audi e-tron Concept is shifted far forward toward the front axle, leaving room in front of the rear axle for the roughly 470 kilogram (1036.17 lb) battery unit, the inverter and the power electronics.

The two electric motors, which have their own cooling system, are mounted behind the rear axle. The front electric motors are mounted on the front axle, with their cooling system arranged in front of them. This special package, which features a 42:58 weight distribution, ensures perfect balance, which contributes to the driving dynamics of the Audi e-tron Concept.

Systematic lightweight construction is an even more important prerequisite for efficiency and range with electric vehicles than for conventionally powered automobiles. The Audi development engineers drew on the core competence of the company for the Audi e-tron Concept. The body structure is based on Audi Space Frame (ASF) technology and was realized as a hybrid construction. All add-on parts - doors, covers, sidewalls and roof - are made of a fiber-reinforced plastic.

The combination of aluminum and carbon fiber-reinforced composite material guarantees supreme rigidity coupled with low weight. Audi will soon use this technology in a similar form for production vehicles. Despite the complex drive system layout with four electric motors and a high-capacity battery system, the total weight of the Audi e-tron Concept is only around 1,600 kilograms (3527.40 lb).

Th Interior and The Control Concept

Optical and functional references to the new drive concept characterize the interior design. They establish an advanced connection between proven Audi genes and new formal hallmarks. Typical for the Audi design language is the reduction of the architecture, controls and flow of information to the essential in favor of visible lightweight construction and a tidy overall impression.

The dash appears to float and has a curve that extends laterally into the door panels. With no need to allow for a transmission, shifter and cardan tunnel, the designers took advantage of the opportunity to create a particularly slim and lightweight center tunnel and center console. The flush gear selector, with which the driver chooses between the modes forward, reverse and neutral, emerges from the tunnel when the vehicle is started.

The cockpit of the Audi e-tron Concept is also oriented toward the driver - a further characteristic Audi trait. Instead of the classic instrument cluster, the concept car is the first Audi to be equipped with a large, fold-out central display with integrated MMI functions. It is flanked by two round dials.

While an analog speedometer on the right provides speed information, the instrument on the left tells the driver how much power is being drawn. The central display shows the range in the status bar and presents all key information from the infotainment and navigation systems. It also provides the driver with relevant data from the vehicle's communication with its surroundings. The instruments combine the analog and the digital worlds into a single unit.

The Characteristic for the concept of the Audi e-tron Concept is the near total elimination of switches and small components such as the ignition. The climate control unit is located to the right above the steering wheel. The display provides temperature and ventilation information. Again drawing inspiration from a smartphone, the system is controlled by means of a touch-sensitive sliding control.

The racing-inspired lightweight bucket seats combine excellent lateral support with comfort. To contrasting colors - snow white and cognac - delineate the various zones of the interior. The colors and the high-quality materials combine elegance and sportiness.

Drive System and Energy Supply
Four asynchronous motors with a total output of 230 kilowatts (313 hp) give the Audi e-tron Concept the performance of a high-output sports car. The concept car can accelerate from 0 to 100 km/h (0 - 62.14 mph) in 4.8 seconds if necessary, and goes from 60 to 120 km/h (37.28 - 74.56 mph) in 4.1 seconds. The torque flows selectively to the wheels based on the driving situation and the condition of the road surface, resulting in outstanding traction and handling.

The top speed is limited to 200 km/h (124.27 mph), as the amount of energy required by the electric motors increases disproportionately to speed. The range in the NECD combined cycle is approximately 248 kilometers (154 miles). This good value is made possible by the integrated concept: technology specially configured for the electric drive system combined with state-of-the-art battery technology. The battery block has a total energy content of roughly 53 kilowatt hours, with the usable portion thereof restricted to 42.4 kWh in the interest of service life. Audi uses liquid cooling for the batteries.

The energy storage unit is charged with household current (230 volts, 16 amperes) via a cable and a plug. The socket is behind a cover at the back of the car. With the battery fully discharged, the charging time is between 6 and 8 hours. A high voltage (400 volts, 63 amperes) reduces this to just around 2.5 hours. The Audi engineers are working on a wireless solution to make charging more convenient. The inductive charging station, which can be placed in the garage at home or also in special parking garages, is activated automatically when the vehicle is docked. Such technology is already used today in a similar form to charge electric toothbrushes.

The battery is charged not only when the car is stationary, but also when it is in motion. The keyword here is recuperation. This form of energy recovery and return to the battery is already available today in a number of Audi production models. During braking, the alternator converts the kinetic energy into electrical energy, which it then feeds into the onboard electrical system.

The Audi e-tron Concept, which is slowed by four lightweight ceramic brake discs, takes the next large step into the future. An electronic brake system makes it possible to tap into the recuperation potential of the electric motors. A hydraulic fixed-caliper brake is mounted on the front axle, with two novel electrically-actuated floating-caliper brakes mounted on the rear axle. These floating calipers are actuated not by any mechanical or hydraulic transfer elements, but rather by wire ("brake by wire"). In addition, this eliminates frictional losses due to residual slip when the brakes are not being applied.

This decoupling of the brake pedal enables the Audi e-tron Concept's electric motors to convert all of the braking energy into electricity and recover it. The electromechanical brake system is only activated if greater deceleration is required. These control actions are unnoticeable to the driver, who feels only a predictable and constant pedal feel as with a hydraulic brake system.

Making its Automotive Debut: The Heat Pump
The heat pump - used here for the first time ever in an automobile - also serves to increase efficiency and range. Unlike a combustion engine, the electric drive system may not produce enough waste heat under all operating conditions to effectively heat the interior. Other electric vehicles are equipped with electric supplemental heaters, which consume a relatively large amount of energy. The heat pump used by Audi - and commonly used in buildings - is a highly efficient machine that uses mechanical work to provide heat with a minimum input of energy.

A high-efficiency climate control system is used to cool the interior. It works together with the thermal management system to also control the temperature of the high-voltage battery. The battery, the power electronics and the electric motors must be kept at their respective ideal operating temperatures to achieve optimal performance and range.

As soon as the vehicle is connected to a charging station the vehicle is preconditioned as appropriate by the thermal management and other associated systems.

The drive system is heated if temperatures are cool, and cooled if hot. This preconditioning can also be extended to the interior, if necessary, so that the passengers can step into a cabin that has been heated or cooled as appropriate for their comfort.

Driving Dynamics
The normal distribution of the tractive power is clearly biased toward the rear axle in accordance with the weight distribution of the Audi e-tron Concept. Similarly to a mid-engined sports car, roughly 70 percent of the power goes the rear and 30 percent to the front. If an axle slips, this balance can be varied by means of the four centrally controlled electric motors. The electric vehicle from Audi thus enjoys all of the advantages of quattro technology.

The four individual motors, which in the interest of greater traction are installed behind the wheels as wheel drives, also enable the Audi e-tron Concept's lateral dynamics to be intelligently controlled. Similar to what the sport differential does in conventional quattro vehicles, torque vectoring - the targeted acceleration of individual wheels - makes the Audi e-tron Concept even more dynamic while simultaneously enhancing driving safety. Understeer and oversteer can be corrected by not only targeted activation of the brakes, but also by precise increases in power lasting just a few milliseconds. The concept car remains extremely neutral even under great lateral acceleration and hustles through corners as if on the proverbial rails.

The chassis has triangular double wishbones at the front axle and trapezoidal wishbones made of forged aluminum components at the rear axle - a geometry that has proven in motorsports to be the optimal prerequisite for high agility, uncompromising precision and precisely defined self-steering behavior. A taut setup was chosen for the springs and shock absorbers, but it is still very comfortable.

The direct rack-and-pinion steering gives finely differentiated feedback. Its electromechanical steering boost varies with speed, so that the Audi e-tron Concept only has to provide energy while steering, and not while driving straight ahead.

As befitting its status, the Audi concept car rolls on 19-inch tires with a new blade design. 235/35 tires up front and 295/30 tires in the rear provide the necessary grip.

Car-to-x Communication

The electronics development engineers at Audi not only aimed to make the Audi e-tron Concept as efficient and fun to drive as possible, they were also very concerned with safety and traffic management. The technical concept car includes a prototype of an information processing system. Future generations of these systems will usher in a new era in the networking of road traffic, particularly in regions and countries with a high volume of traffic. This progress is made possible by the rapid advancements in computing power, software and communication technology.

The buzzword "car-to-x communication" refers to the direct exchange of information in flowing traffic and to the traffic environment. The letter "x" is a free variable that can refer just as easily to other vehicles as to fixed infrastructure such as traffic lights. In contrast to today's telematic systems, car-to-x communication no longer requires a central service provider to quickly and effectively pool and process information. The participants themselves perform these tasks by spontaneously networking with one another.

The future car-to-x network still needs some time before it becomes reality on the roads. This obstacle is one that can be overcome, however, as nearly every carmaker in Europe, the U.S.A. and Japan has decided to develop a common standard for hardware and software. Once all new cars are equipped with this technology, a functional network of automotive transmitters will soon be available, at least in large population centers.

BMW Efficient Dynamics Concept, 2009

The BMW Vision concept car clearly demonstrates that the EfficientDynamics objectives are fully compatible when applied to a sports car. Conceived as a 2+2-seater with plug-in full-hybrid technology, the unique car combines the performance of a BMW M vehicle with a standard of fuel efficiency and emission management that exceeds even the current levels achieved by the latest small cars. The outstanding result is made possible by the combination of BMW ActiveHybrid components with an extremely economical combustion engine, and outstanding aerodynamic qualities.

The BMW EfficientDynamics Concept is the result of a "clean-sheet" development process to ensure that the correct achievements were made in the areas of efficiency, driving pleasure, technology, and emotional design. BMW EfficientDynamics Concept is the most comprehensive implementation of the EfficientDynamics philosophy seen so far. The powertrain provides a top speed limited electronically to 155 mph, with acceleration to 100 km/h in 4.8 seconds. Average fuel consumption in the EU test cycle is 3.76 liters/100 kilometers, equal to 62.6 mpg, and the CO2 emission rating is 99 grams per kilometer. CO2 emission management is even more outstanding when driving in the all-electric mode after charging the battery from a plug-in source: Taking all emissions in the generation of electricity into account, as prescribed by the EU formula, the car's emission rating is just 50 grams per kilometer.


The power and performance are made possible by combining a fuel-efficient 3-cylinder turbodiesel with one electric motor on each axle. The intelligent combination of these units, together with precisely controlled energy management, simultaneously enhances the dynamic performance and the efficiency of the car. Overall system output is 356 horsepower, and peak torque is 590 lb-ft. The special arrangement of the two motors and diesel engine allows all-wheel drive when driving in all-electric mode. The result is minimum power loss and a harmonious transmission of the power available under all conditions.

BMW EfficientDynamics Concept for the first time conveys the dynamic look of a BMW sports car to a hybrid vehicle. Developed with decades of experience in Motorsport, the body of this unique sports car is a result of intelligent lightweight technology and aerodynamic efficiency. In the design of the interior, the focus was likewise on both the fascinating driving experience and, in particular, on transparent, hands-on technology and maximum reduction of weight.

Turbodiesel engine with unprecedented specific output.
The combustion engine is a cutting-edge turbodiesel featured for the first time in the BMW EfficientDynamics Concept car. Displacing 1.5 liters on three cylinders, the engine consistently follows the downsizing principle of using a relatively small engine combined with a turbocharger to reduce fuel consumption.

Through its compact dimensions, the 3-cylinder fits conveniently in front of the rear axle like in an agile mid-engine sports car, despite the two seats at the rear. Fuel is injected by the latest generation of High Precision Direct Injection, and the turbocharger features variable intake geometry for maximum efficiency. Engine output is 163 hp with peak torque of 214 lb-ft.

The specific output of 109 hp per liter sets a new benchmark in diesel technology. The power delivered by the turbodiesel is conveyed to the rear axle by means of a double-clutch transmission (DCT). This advanced transmission technology, which already offers a particularly dynamic driving experience in BMW's M3 and Z4 Roadster, allows the driver to shift gears without the slightest interruption of power. BMW EfficientDynamics Concept features a newly-developed version of BMW's DCT with six speeds for maximum efficiency and flexibility.

Two electric motors for full-hybrid drive.
The combustion engine is supplemented by two electric motors. Consistently applying the BMW ActiveHybrid philosophy, development engineers followed the principle of "Best of Hybrid," choosing the optimum combination of a hybrid synchronous motor on the front axle and a full-hybrid system at the rear.

The driver benefits from the efficiency of the electric motors over a far wider speed range than with a conventional hybrid car. The rear axle comes with a second-generation full-hybrid system corresponding to the technology in the BMW ActiveHybrid 7 production model. The compact electric motor positioned between the diesel engine and the DCT outputs a consistent 33 horsepower and is able to reach a peak of up to 51 hp. Maximum torque for the rear electric motor is 214 lb-ft, the power, either supporting the diesel engine or in all-electric motoring.

The engine, a hybrid synchronous motor, offers continuous output of 80 horsepower and peak torque of 162 lb-ft. Extra power of 112 horsepower is available for a period of up to 30 seconds, and, for a 10-second "burst," the electric motor is able to develop 139 horsepower. The power is transmitted through a 2-stage, single-speed reduction gearbox.

BMW EfficientDynamics Concept is able to run completely under electric power, with the power of the turbodiesel engine alone, or through an infinite combination of the three power sources. Depending on driving conditions, the two electric motors may be used both for accelerating and for regenerating energy when applying the brakes and while coasting. This principle ensures efficient energy management, with the charge status of the lithium-polymer battery constantly remaining within the optimum range. When accelerating, the electric motors help to boost the car for even greater performance, ensuring immediate response and a significant reduction in fuel consumption. For a short time, such as in passing maneuvers, the cumulative maximum output of all three engines increases to 356 hp, with maximum torque generated by the three engines reaching 590 lb-ft.

The lithium-polymer battery for electrical energy.
The energy cells featured in BMW EfficientDynamics Concept are housed in a chassis element running from front to rear through the middle of the car. The front unit is the lithium-polymer complex, an ongoing development of the lithium-ion battery. Overall, BMW EfficientDynamics Concept comes with a total of 98 lithium-polymer cells, each offering a capacity of 30 amp/hours and developing continuous output of 600 Amps at a voltage of 3.7 V. For a period of 30 seconds, each cell is even able to develop maximum output of 1,200 Amps.

The serial arrangement of the lithium-polymer cells serves to generate nominal voltage of 364 volts, the gross storage capacity of the battery is 10.8 kW/h. With an unusually high discharge capacity of 80 percent, the battery delivers 8.6 kW/h for driving the car. This superior performance comes on overall weight of the entire energy storage system of just 187 lb. A further advantage is that through their optimum dimensions tailored to the specific qualities and features of the car, the lithium-polymer cells, together with the operating strategy chosen with a concept of "forward looking" energy management, reduces the thermal load acting on the battery to such an extent that there is no need for active cooling.

The Plug-in solution: convenient charging of the electric power system from a conventional power socket.

The Brake Energy Regeneration captures electric power generated while driving without additional fuel consumption, which is subsequently used to supply power to the electric motors and on-board network. A further option is to connect the lithium-polymer cells to a conventional power socket for a simple and efficient charge process, using a plug-in connector in the front-right wing of the car. Connected to a standard EU power outlet (220 V, 16 Amps), the system requires a maximum of 2 ½ hours to fully charge the lithium-polymer cells. And wherever a power source with higher voltage and amperage (380 V, 32 Amps) is available, the charge time is an even shorter 44 minutes.

The Fuel efficiency and emission management opening new dimensions in hybrid technology.
The power delivered by the two electric motors and single diesel 3-cylinder engine gives the BMW EfficientDynamics Concept a level of performance superior to anything provided so far by a hybrid vehicle. Acceleration from a standstill to 100 km/h, for example, comes in just 4.8 seconds and the car could exceed its electronically-limited 155 mph top speed.

The fuel efficiency and emission management now reach a standard only achieved, if at all, by far less powerful small cars conceived for city traffic and short distances. Applying the criteria of the EU test cycle, BMW EfficientDynamics Concept offers average fuel consumption equal to 62.6 mpg. CO2 emissions, in turn, are 99 grams per kilometer. These consumption and emission figures are measured on a consistent internal power balance, meaning that the batteries and storage media for electrical energy maintain the same charge level throughout the entire test cycle (with the same level at the beginning and end) and are charged while driving only by the car's on-board systems.

As a plug-in hybrid, BMW EfficientDynamics Concept is able to cover the entire drive cycle for measuring fuel consumption also with its combustion engine completely switched off. Then, to subsequently charge the lithium-polymer cells to the same status as when setting off, all the driver has to do is connect the car to an external power grid. To determine the consumption of electric power, the only requirement is to compare the charge level of the battery before and after the test cycle. Applying this measurement process, the BMW EfficientDynamics Concept car consumes 17.5 kW/h per 100 kilometers, equal to a CO2 emission rating of just 50 grams per kilometer in the EU test cycle.

To determine the total volume of CO2 emissions when driving in the all-electric mode, new legal standards for measuring the level of fuel consumption are currently being prepared for hybrid and electric cars with a plug-in power supply. Applying this calculation method, the CO2 emission ratings generated by BMW EfficientDynamics Concept are reduced further to just one-third of the original figure of 99 grams per kilometer. Clearly, this significant reduction of emissions opens up a new dimension in BMW's EfficientDynamics development strategy in this unique concept car.

The Aerodynamic qualities reflecting BMW's Motorsport experience.
BMW EfficientDynamics Concept also takes a new approach in its design and streamlining, the body and the interior clearly expressing the unique combination of supreme efficiency and the sporting performance of the brand. Following BMW's design language, this concept car visualizes both highly efficient aerodynamics and intelligent lightweight construction.

BMW EfficientDynamics Concept differs from the usual low-emission car concepts. The principle of "form follows function" is not just for the overall look of the car, but embraces each and every detail. Measuring 48.8" in height and boasting a sweeping, arch-like roofline, BMW EfficientDynamics Concept offers the slender silhouette of a classic Gran Turismo. With the combustion engine fitted in front of the rear axle, the designers have succeeded in giving the car a very low front end, with the flow of air being further smoothened by active louvers in front of the radiator, which close completely when the need for cooling air is low. This efficient function follows in the footsteps of the active air flap control already used as a feature of BMW EfficientDynamics in some of BMW's current production models. As a further highlight, BMW EfficientDynamics Concept guides air smoothly and exactly as required into the car through an active air intake at the front.

The design of the body are based on the know-how BMW has gained in Motorsport, a number of body elements serving as air deflectors and guide vanes. Designed as ducts, for example, the A-pillars serve to channel the flow of air in the same way as the rear lights with their wing profile. The floor of the car is fully covered from front to rear and from one side to the other, thus maintaining a smooth surface to avoid any air swirl liable to increase fuel consumption. Slender openings around the front air dam guide the air flowing specifically into two closed ducts leading inside the front air dam to the wheel arches where the air comes out again through a very slim aperture at high speed, flowing just next to the outer wheel flanks. This air jet rests on the front wheels like a curtain and is therefore referred to most appropriately as the "air curtain." It provides a highly stabilizing effect.

Overall vehicle concept for a drag coefficient of just 0.22.
To further optimize the aerodynamic qualities of the entire vehicle and keep rolling resistance to a minimum, BMW EfficientDynamics Concept comes with tires and wheels of quite unusual size on a sports car. The tires measure 195/55, while large 21-inch wheels provide a contact surface on the road otherwise offered only by a much wider tire. In combination with the sophisticated axle geometry, this ensures agile driving behavior.

The extra-large wheel covers extending over part of the tire flanks add to the unique, very different look of BMW EfficientDynamics Concept from the side. The blade profile integrated in the wheels serves furthermore to reduce the negative effect of the turning wheels on the overall aerodynamics of the car. In all, these features optimizing the aerodynamic qualities of the car give the BMW EfficientDynamics Concept car a very low drag factor (CX) of just 0.22.

Technological look as a strong impression of intelligent lightweight construction.

In both exterior and interior design, BMW EfficientDynamics Concept stands out clearly as a strong spearhead in technology. Many components of the vehicle are presented in full view expressing the "transparent" character of the car as a powerful visual feature of lightweight technology. The chassis and suspension of BMW EfficientDynamics Concept are made completely of aluminum; the roof and the outer skin on the doors are made almost completely of a special polycarbonate glass automatically darkening as a function of the light shining on the car.

Emotional design through sculptural shapes and layering technology.
Reflecting the innovative drive concept of this unique car, the design of BMW EfficientDynamics Concept likewise takes a new approach in combining functional progress with a most powerful emotional impact.

This has been achieved through the close cooperation of BMW's Design and Technical Development Divisions starting at an early point and continuing consistently throughout the entire development process. The result is a brand-new vehicle architecture with the drive components as well as the body and interior elements perfectly coordinated and matched to one another with maximum flexibility and individual style.

A fully integrated design philosophy also provided new options in using harmonized design principles connecting the exterior and the interior and providing an interacting effect between the two areas.

Sculptural design language giving BMW EfficientDynamics Concept a fully harmonized, complete look ensures the proportions typical of a BMW sports car. The front, side, rear and roof areas, for example, flow smoothly into one another. Dynamically contoured surfaces and shapes, in turn, create highly attractive light and shade effects accentuating the light and sporting character of the car in an emotional manner.

Layering technology developed by the BMW Group Design Division acts as the fundamental guideline in designing the exterior and interior. Applied for the first time in exterior design, this technology layers one surface on top of the other, creating very smooth seams and joints to reduce the number of components and, accordingly, the weight of the car. As a result, BMW EfficientDynamics Concept meets the most demanding aerodynamic requirements without using any additional body elements, simply through the structure of the surfaces optimized for a smooth flow of air.

Interior: innovative lightweight construction and unprecedented orientation to the driver.

Innovative layering technology provides an unprecedented symbiosis of function and stylish shapes intentionally reduced to a minimum, consistently implementing and visualizing the lightweight principle also inside the car.

Specific components such as the central air vent not only serving to enhance motoring comfort but also acting as part of the cockpit, perform several functions in one. This multi-functionality is then presented visibly within the car, the use of particularly sophisticated materials providing a highly attractive combination of innovation in technology and quality clear to the eye and the touch of the surface.

This interaction of lightweight construction and individual well-being also comes out clearly in the design of the controls and switches, with a leather band, for example, running round the aluminum gear selector lever on the center console. Materials combining lightweight technology and all the qualities required are also to be admired all round the cockpit of BMW EfficientDynamics Concept, giving the car an unusually generous feeling of space for a 2+2-seater. The body-contoured seats, for example, are made up of a kevlar shell, a backbone structure, and seat padding with personalized fillings. Clearly, this combination alone ensures comfort at a minimum weight. The driver's and front passenger's seats are connected firmly to the center console to form a joint interior "landscape", while the rear seats anchored on the floor would appear to be hovering in space. Natural materials and light colors on the seat upholstery and all interior linings underline the light, sophisticated and sustainability-oriented atmosphere within the passenger compartment.

The instrument panel is deliberately padded only where technical components have to be appropriately covered, thus making an important contribution to passenger safety in the event of a collision. The instrument cluster played a fundamental role right from the start in the design process, serving as the starting point for all surfaces within the interior and thus creating a particularly powerful rendition of that driver orientation typical of BMW.

Innovative light technology: providing clear signals to the outside and offering soothing ambient illumination inside in a unique symbiosis.

LED lights at both the front and rear end of BMW EfficientDynamics Concept provide an innovative combination of the symbols typical of the brand and clear design language oriented towards trendsetting technology. The distinctive look of the dual round headlights characteristic of a BMW is emphasized in particular by the use of LED technology. The rear lights are integrated also in their function into the design of the entire rear section, forming part of the rear air deflector and thus merging completely into the rear contour.

Extremely flat and compact, the rear lights are made up of innovative LED units forming a smooth and consistent red surface when not in use. Only when used do the respective light chambers take on the appropriate color such as yellow on the direction indicators. This innovative light technology also provides an intense symbiosis of the exterior and interior, again promoting and further refining the driving experience.

This is also why the ambient illumination of the interior comes with new features and qualities, the light sources within the passenger compartment being fed from the positioning lights at the side, the rear lights and the brake lights, thus changing the atmosphere created by the lights within the car as a function of driving conditions.

The optical impression conveyed by BMW EfficientDynamics Concept also results in other areas from the symbiosis of the exterior and interior, eliminating the conventional barriers between the two. The lines within the interior, for example, continue on to the innovative design of the engine compartment lid, while in its shape the third brake light positioned higher up on the car follows the structure of the glass roof and tapers to the outside where the roofline moves down gently to the rear.

Overhead doors for convenient access to all seats.

The doors on BMW EfficientDynamics Concept open up like bird's wings, turning on pivots in the front roof column at the level of the side direction indicators. Since the car has no B-pillars, the large door cutouts ensure convenient entry also to the rear seats. The pivots on the doors also provide the base for the exterior mirrors, thus forming an ideal combination of function and aesthetic design. The structure of the doors is also characterized by several layers of materials on top of one another and the optical and functional symbiosis of the interior and exterior this technology is able to offer.

The large glass surfaces extending far down on the body also provide a strong optical impression of the low seating position close to the road. And at the same time a stable sidebar ensures the body stiffness and crash safety naturally required on every vehicle. Flowing to the inside at its central point, this safety element also serves as an armrest. This interplay of the three layers also helping to minimize the weight of the car continues on the trim bar running along the door and extending out of the armrest, finally flowing into the outer door opener on its path from inside to outside.

Citroen REVOLTe Concept, 2009

A vibrant and sophisticated re-chargeable hybrid, Citroën REVOLTe Concept represents a bold vision of the luxury, compact city car of tomorrow, combining confident styling with environmentally responsible technology to create a unique concept for the future of urban transportation.

The Citroën REVOLTe Concept reflects the changing role of small cars with style and elegance becoming as important as economy and practicality. True to Citroën's credentials as a bold and forward-thinking brand, Citroën REVOLTe Concept snubs the traditions of the conventional small urban vehicle, bringing a highly contemporary approach to the segment.

Inspired by the Citroën 2CV, REVOLTe takes the key attributes of Citroën's timeless and iconic classic and turns them on their head - a clear example of Citroën looking to the future by taking inspiration from its cool past. Where the 2CV was plain and neutral, REVOLTe is luxurious and colourful; where the 2CV was basic and simple, Citroën REVOLTe Concept is intelligent and technologically advanced and where the 2CV was slow and bouncy, REVOLTe is lively and spirited.

With a visually-stunning low stance, Citroën REVOLTe Concept measures just 3.68m long, 1.73m wide and 1.35m tall. The well defined wheel arches, curving bonnet, forceful lines and sculpted sides that match the roof line, all combine to present a sleek and elegant profile.

Rear-hinged doors provide easy access to the multi-coloured cabin, with woven black leather, thick crimson velvet and gleaming aluminium. REVOLTe's bright colours and luxury styling reflects Citroën's bold creativity and the desire to modernise notions of conventional car design. Thanks to iridescent, glossy colours, silky smooth textiles and sophisticated materials, Citroën REVOLTe Concept has a vibrant, dare-to-be-different interior that throws tradition aside. The result is a small urban vehicle much more like a fashionable, glamorous and clearly feminine accessory to the driver's modern lifestyle.
Citroen REVOLTe Concept

The original and distinctive three-seater layout - driver's seat to one side with two passenger seats behind it - is designed to resemble a lounge, with the rear seats taking the form of a contemporary sofa. The passenger on the opposite side to the driver can stretch out their legs fully into the space where the front passenger seat would have traditionally been. Alternatively, Citroën have made it possible to fit a rear-facing child-seat in the space available. Notably, the rear seats also serve to conceal the concept's battery pack, maximising useable cabin and luggage space.

The Citroën REVOLTe Concept also introduces luxury from the application of technology. The touch-sensitive screen that projects forward from the dashboard is encased in a deep-red beam of crystals - that also recycles the air on-board like a respiratory system. On the outside, REVOLTe's folding roof is covered with solar cells, which feed power to systems controlling on-board comfort - and reducing the load on the batteries. At the very front of Citroën REVOLTe Concept, a backlit glass element is incorporated into the grille - this original feature highlights the chevrons above, subtly asserting the concept's identity as true Citroën.

With a design philosophy of sophistication and the use of environmentally responsible technology, Citroën REVOLTe Concept's re-chargeable hybrid power-train features a small-capacity conventional combustion engine combined with an electric motor and a battery re-charging function. Agile and responsive, REVOLTe's advanced drive-train delivers lively performance suited to the urban environment. Citroën REVOLTe Concept also provides the option of CO2-free driving with the ability to run in all-electric ZEV (Zero Emission Vehicle) mode.

Ford Grand C-MAX, 2011

The all-new Ford C-MAX range introduces a number of advanced new technologies to the compact MAV class focused on enhanced comfort, safety and sustainability, including the availability of new and powerful yet highly fuel-efficient low-CO2 Ford EcoBoost petrol engines.

The new Ford C-MAX models are also the first products to be launched from Ford's new, global C-segment vehicle platform, and are previewed at Frankfurt in pre-production form prior to their European sales launch in late 2010.

Expressive, Dynamic Design
The new Ford C-MAX range demonstrates that compact MAVs can be stylish and desirable while still delivering outstanding space and functionality.

Bold exterior and interior designs have been created using the latest evolution of Ford's 'kinetic design' form language, building on the themes established in recent product introductions like the hugely successful Fiesta, Kuga and Mondeo ranges.

Striking 'kinetic design' elements applied to the new models include the dynamic rising belt-line, full sculptured surfaces, bold wheel lips, strong athletic shoulders supported by a prominent undercut line, and the distinctive kick-up of the window graphic at the C-pillar.

The front end design features Ford's signature trapezoidal lower grille - with a special 'piano black' finish on the Frankfurt Show vehicles - together with the eye-catching new headlamp treatment previewed by the iosis MAX concept.

Two Distinct Characters
The Ford C-MAX and Ford Grand C-MAX have been deliberately designed with two distinct characters, reflecting the differing priorities of the typical customers for each model.

The 5-seat Ford C-MAX departs from usual MAV thinking by adopting a sportier feel with a stylish passenger-car look. It features a coupé-like, sweeping roofline which falls off to the rear, yet still retains the traditional Ford C-MAX virtues of roominess and practicality.

The window graphic follows the bold form of the Fiesta and Kuga, with a strong kick-up after the C-pillar. At the rear, the tailgate design has echoes of the larger S-MAX, with its sportier treatment of the rear window.

Equally dynamic in character, the 7-seat Ford Grand C-MAX presents a more functional appearance which highlights the extra space and versatility provided by the car. With a longer wheelbase, the 7-seat model features a higher roofline and thinner pillars which emphasise the generous room and visibility on offer within the cabin.

The twin sliding doors are neatly integrated, with the rail cleverly concealed by the undercut line on the shoulder of the vehicle. The large tailgate design ensures a low loading height, while the stylish intersection between the tail lamps and rear glass gives a family resemblance to the Galaxy, Ford's largest people mover.

Stylish and Modern Interior
The new Ford C-MAX interior applies the same 'kinetic design' philosophy used to shape the body, ensuring that the dynamic and modern character of the exterior is reflected in the style of the cabin.

The main design themes are an evolution of those developed for the latest Fiesta, with muscular, expressive shapes and very bold graphics which are inspired by the stunning forms seen on the iosis MAX concept car.

Key design features include the taut, wing-like section of the upper instrument panel (IP), which reaches out to the sides of the interior. A dramatic 'bull horn' shape sweeps down from the lower IP, emphasising the smooth flow from the IP into the centre console.

The cockpit - which is common to both Ford C-MAX models - provides a commanding, raised driving position with high mounted gearshift and centre console.

The central control area builds on the much acclaimed layout in the new Fiesta, with lower series models using the same ergonomic control design, while high series vehicles use next generation Sony head units with a gloss black finish.

Carefully designed storage areas are located throughout the cabin, including generous door pockets, a large glove box, and additional compartments and cupholders in the centre console.

Ingenious 7-seat Layout

The new 7-seat Ford Grand C-MAX provides spacious accommodation for up to seven passengers within compact exterior dimensions, with the extra convenience offered by sliding rear doors on both sides of the car - ideal for parents helping young children in child seats, or for easy access in narrow parking bays.
The Ford engineers have developed an ingenious new seat folding mechanism for the three second-row seats. This mechanism allows the centre seat to fold quickly and easily under one of the two outboard seats, creating a handy walk-through space between them.

This allows passengers to access the third row without having to disturb the two outer seats, which is particularly helpful when those positions are occupied by child seats or booster cushions. Owners thus have the option of using the convenient 2+2+2 seating layout, or switching to a full seven-seater when required.

The second- and third-row seats have been cleverly engineered so that they can be folded to create a flat load floor, irrespective of how many seats remain in use. All of the folding mechanisms are designed so that they require just one hand to operate.

The 5-seat Ford C-MAX retains the popular seating arrangement from the current model with three individual 40/20/40 folding seats, and the option of the Comfort system which allows the outer seats to slide diagonally backwards and inwards to create a luxurious 2+2 layout.

Sustainable Performance
The Ford C-MAX range introduces a number of advanced new vehicle and powertrain technologies to the compact MAV class to enhance comfort, safety and sustainability.

In addition to upgraded versions of Ford's highly acclaimed TDCi diesel engines, the new Ford C-MAX line-up will also feature a choice of petrol engines, including the first application of Ford's all-new 1.6-litre 4-cylinder Ford EcoBoost engine, to be built at the company's Bridgend plant in Wales.

Ford's new global family of EcoBoost 4-cylinder engines have been developed by Ford powertrain engineers based in Europe and are being progressively introduced to the European product range starting in 2010. EcoBoost combines turbocharging and direct injection technology to deliver fuel consumption and CO2 emissions reduced by up to 20 per cent compared to conventional larger displacement petrol engines with a similar power output.

Ford EcoBoost technology will be more affordable than equivalent hybrid or diesel engine designs, and builds on existing petrol engine knowledge to provide customers with a way to improve fuel economy and emissions significantly without compromising driving performance.

The combination of direct fuel injection, advanced turbocharging, and variable valve timing creates a much more efficient combustion process. This enables Ford EcoBoost technology to deliver the strong low-end torque and responsive performance of a large capacity engine, but with the size, weight and fuel economy of a much smaller unit.

The new Ford C-MAX will also feature the option of Ford's latest high efficiency PowerShift six-speed dual-clutch automatic transmission, which is proving an increasingly popular choice on the current model.

C-MAX Technologies
Among the new technologies being introduced to Ford of Europe in the Ford C-MAX range are a host of features which will improve practicality and safety for family users. These innovations include semi-automatic parallel parking, blind spot detection, seat belt warning lights for rear seat passengers, power activated child locks and power operation for the rear tailgate.

New Generation of Global Ford C Cars
The Ford C-MAX is the first of a new generation of global C cars scheduled for introduction by Ford over the next several years. This series of exciting new models will include the launch globally of the all-new, next generation model of the best-selling Ford Focus from the end of 2010.

The new C car family is the result of an unprecedented global development programme, and is loaded with an impressive array of advanced vehicle technologies which will enhance safety, convenience, comfort, and driver satisfaction.

Acura RL, 2009

The Acura RL

The Body and Chassis
To further enhance handling and ride comfort, the new Acura RL retains a fully independent suspension system with front double-wishbone and rear multi-link architecture. For 2009 the Acura RL features higher rate coil springs, larger diameter stabilizer bars, stiffer subframe mount bushings and improved design steering rack components. To further improve handling and looks, new 18-inch diameter 7-spoke aluminum wheels are matched with more aggressive tires.

Exterior and Interior
The Acura RL's new exterior styling is not only more aggressive, but delivers excellent aerodynamics and reduced rear lift at higher speeds. The Acura RL's more athletic style foreshadows the power concealed by the new power plenum front grille and blow-formed aluminum hood. The RL's shape is taut and athletic, and its acceleration and cornering performance allow it to challenge the most capable German and Japanese sports sedans. Comfort, quietness and ride quality are also on a par with performance sedan competitors.

Inside, the Acura RL features a more elegantly styled interior that includes more room for rear seat passengers, easier-to-use front seat belts, door-mounted pull pockets, softer arm rests, redesigned vents, larger/clearer lettering for HVAC controls, and easier actuation of climate control functions. A revised steering wheel with available genuine wood trim (included with the CMBS package) and metal-look accents is now fitted to the Acura RL along with a matching wood-trimmed transmission shift knob. Complementing the steering wheel are upgraded gauges that incorporate brushed metal accents for enhanced appearance. For 2009, additional insulation, a more high-tech design of Acura's acoustic glass windshield, and a new Active Sound Control (ASC) noise abatement system team to further reduce the Acura RL's already quiet cabin.

The Safety
The Acura RL retains Acura's extremely rigid Advanced Compatibility Engineering body structure that features extensive use of high-tensile steel and lightweight aluminum components to take vehicle construction beyond conventional safety protocols while keeping overall vehicle weight in check. The ACE structure's front-mounted polygonal main frame is designed to help prevent cabin deformation by distributing frontal impact forces through multiple load bearing pathways--and away from the passenger compartment. For 2009, to enhance safety a new Active Head Restraint System is built into the front seats to help improve neck and head protection in the event in a rear impact collision. To further aid in safety, the Acura RL includes as standard a passenger seatbelt reminder, Tire Pressure Monitoring System (TPMS) and six airbags.

Audi S5 Cabriolet, 2010

Audi S5 Cabriolet

The engine in the Audi S5 Cabriolet is a newly developed, supercharged, three-liter V6. The pressure in the 3.0 TFSI is generated by a mechanical supercharger - with impressive results: The power output tops out at 245 kW (333 hp), the torque between 2,900 and 5,300 rpm remains constant at a generous 440 Nm (324.53 lb-ft). The powerful thrust and the spontaneous, aggressive response make for a fascinating driving experience. The Audi S5 Cabriolet is catapulted in 5.6 seconds from zero to 100 km/h (62.14 mph) and accelerates up to a preset top speed of 250 km/h (155.34 mph). Yet at 9.6 liters per 100 km (24.5 US mpg), its fuel efficiency is highly impressive (preliminary values).
Standard equipment of the Audi S5 Cabriolet includes the servotronic, the seven-speed S tronic and the quattro drive system package. A sport suspension keeps the body close to the road. The 18-inch cast aluminum wheels are equipped with 245/40 tires. The black brake calipers are emblazoned with S5 emblems. The acoustic top, xenon plus headlights, electrically adjustable sport seats with Alcantara leather upholstery, and a multifunction sport steering wheel are also standard equipment.

Audi drive select is only available in combination with one or more of three additional technologies - the sport differential, the adaptive control for the shock absorbers, and dynamic steering. This is an additional high-tech solution: Its superposition gear varies the gear ratio as a function of the driving speed by up to 100 percent.
The new Audi A5 Cabriolet features a rich array of equipment, including 17-inch alloy wheels, automatic air conditioning, and an audio system with a CD player. One of the highlights among the optional equipment is the third-generation MMI operating system, which provides many attractive navigation and entertainment functions.
As the dynamic top-of-the-line model of the new production series, the Audi S5 Cabriolet occupies a very special position. Its three-liter TFSI - a V6 with turbocharger - unfolds its 245 kW (333 hp) and 440 Nm (324.53 lb-ft) of torque impressively: It responds tenaciously to the throttle and delivers excellent driving performance. The quattro drive, a sport suspension with 18-inch wheels and a number of special equipment details underscore the athletic power of the Audi S5 Cabriolet.

The convertible top
The fabric top with the large glass rear window fits smoothly into the design profile. This is one of several reasons why Audi preferred it to a folding steel roof. What's more, its construction is much lighter in weight, which reduces the overall weight of the Cabriolet and lowers its center of gravity. The outer skin of the top is available in a choice of four colors, the inside in three.
The softtop consists of three layers. The intermediate layer is a cushioning pad. In the optional acoustic top, which reduces wind noise almost to hardtop level, this is replaced by a foam layer up to 15 millimeters (0.59 in) in thickness. The acoustic top comes with a ceiling light for the rear seat - a solution usually only found in the topmost convertible luxury segment.

Lexus IS Convertible, 2008

Convertible Aerodynamics, 2008

The Lexus IS convertible has a best-in-class 0.29 drag coefficient (Cd). This is accomplished with the help of underbody covers below the engine (with aerodynamic steps), the full floor, and fuel-tank covers, as well as s rear-floor diffuser with vertical fin and airfoil. Other areas that contribute to the low Cd include the design shape of the outer mirrors, high-mount stop lamps, and the rear tailamps. Fender fairings before the front and rear tires reduce airflow into the wheel house, improving aero characteristics and reducing air turbulence.

The Lexus IS convertible's air conditioning system automatically adjusts for the outside temperature when the top is lowered, improving interior temperature consistency and comfort. The system adjusts the air outlets, temperature and air flow exiting the outlets. The airflow volume adjusts to outside temperature and vehicle speed, while the temperature control adjusts to outside temperature, amount of sunlight and vehicle speed. The system also includes a pollen filter and variable-control compressor.

Convertible Body Rigidity
The Lexus IS convertible's body structure has excellent rigidity and strength, achieved by effective structural changes and additions to the existing IS sedan platform.
The transformation to a convertible also required reevaluation of noise, vibration and harshness (NVH) characteristics in order to meet Lexus standards. All body and chassis revisions have gone through extensive testing to ensure that the IS250C and IS350C have nearly identical NVH characteristics as the IS sedans. High-rigidity damping materials and asphalt sheets have been added to minimize vibration effects. Redesigned rear-suspension-mount bushings help reduce noise and vibration associated with the changes in body characteristics from a sedan to a convertible.

Easy Access Utility & Comfort
The new Lexus IS convertible emphasizes easy access and rear-seat comfort. In addition to front doors that are 11.8 inches longer than the IS sedans, two convenient fold-forward lock-release levers are standard on both sides of the front passenger seats, making it easier to operate from any location inside the vehicle. The passenger seat features a power slide button on the top of the seatback to ease rear seat ingress/egress. An available new automatic one-touch, easy-entry power-seat mechanism provides even easier egress and ingress through quick-acting, front-seat fold-and-slide activation. The two passenger doors also have three open-stopping positions (rather than the normal two) to add convenience in various parking situations with different spacing between vehicles. The IS C also is equipped with a standard power tilt and telescoping steering column to help the driver quickly get into a comfortable position.

The optional Intuitive Park Assist (IPA) system uses ultrasonic sensors to detect objects close to the car's front and rear bumpers, alerting the driver and showing distance to objects in the multi-information display within the speedometer. When any IS model is also equipped with the optional navigation system, information on objects detected in the rear are shown in greater detail on that system's seven-inch display via the backup camera.

Lexus Safety & Security
Standard Vehicle Dynamics Integrated Management System (VDIM) governs all of the vehicle's dynamic handling systems - the Anti-lock Braking System (ABS), Brake Assist, Vehicle Stability Control (VSC) and Traction Control (TRAC) - employing them collectively and seamlessly to make corrections while helping provide higher dynamic capability. VDIM also interfaces with the electronic throttle control system.

Nissan 370Z, 2009

Nissan 370Z

The new Nissan 370Z sports a shorter wheelbase, greater use of lightweight body materials, new engine with more horsepower and a new 7-speed automatic transmission with paddle shifters, as well as the world's first synchronized down/up shift rev control system for the manual transmission.
Designated the Nissan 370Z, one need look no farther than the subtle upswept line of the new rear quarter window. Quintessentially Z, the window is reminiscent of the original 1970 Nissan 240Z - a car that revolutionised the sports car world with its unique combination of performance, style and, especially, value. The new Nissan 370Z continues this philosophy, offering accessible performance, true sportscar handling and athletic, agile design.

The New Exterior:
More athletic, more muscular.
The 2009 370Z's dynamic new styling offers dual benefits - a more aggressive appearance and a lighter, tighter structure for enhanced performance. The new Z's wheelbase is nearly 100mm shorter than the previous generation Nissan 350Z (2550mm versus 2650mm), accomplished by moving the rear wheels forward in the 2nd generation FM platform, while overall length is reduced by 70mm (4250mm versus 4320mm). At the same time, the overall width been increased by 33mm and the rear track by 55mm.

The more compact exterior dimensions and expanded use of lightweight materials help reduce weight, while at the same time the body structure has been extensively reinforced, improving rigidity.
Along with its new structure and stance, the Nissan 370Z has a taut new skin - one that looks completely new, yet completely Z. The exterior design incorporates intentional 240Z styling cues, a sleek aerodynamic shape, a "dynamic motion" feel with a dramatic cantilevered roof (with Nissan GT-R styling cues) and a "low visual gravity."

The 370Z's sleek silhouette is defined by its upswept quarter window design that is echoed by the dynamic upward curvature in the lower rocker panel and the sense of the taut sheet metal molding itself around the wheels and frame. Attention to detail and functionality is evident throughout the exterior design, including the addition of a turn indicator integrated into the Z logo mounted between the front wheel and door.

The Interior: putting the driver at the heart of the action
The interior design of the new Nissan 370Z continues the Z tradition of enhancing driving pleasure, no matter what the road or traffic conditions offer. Additionally, particular attention has been paid to the quality of the material, as well as the fit and finish.
The traditional 2-seat layout is built around a deeply scooped instrument panel with a full-length centre console separating the driver and passenger's seat. In the rear is an open luggage area with enhanced storage and accessibility.
The information layer provides enhanced visibility with easy access to all key data. The gauges are once again attached to the steering column, so the driver doesn't have to choose between the perfect steering wheel position and visibility of the gauges.

The Interior packaging is also enhanced from the previous generation, including the removal of the rear strut brace (replaced with less intrusive structural reinforcements) and by adding a new "shelf" area behind the seats, creating an ideal area for storing briefcases. A retractable cover is standard on the 370Z and locking glove compartment has been added.
Life on board has been improved thanks to the addition of an engine start and stop button, larger diameter dials and thanks to the use of premium-feel material on seats, armrest and door trims (depending on grade).

3.7-litre engine: the Z's heart and soul
The new Nissan 370Z is now powered by a 3.7-litre VQ37VHR engine with VVEL (Variable Valve Event and Lift). Along with its larger displacement, the new engine gives better power delivery all the way to the 7,000 rpm redline, improved low-end power and more high-end torque, creating an entirely new driving experience. Approximately 35 percent of the engine's parts are new, versus the previous design. Power is rated at 331PS, while torque is 366Nm. Engine output, figures for Europe are subject to homologation.
The new engine is backed by a choice of two new advanced transmissions, both designed to improve driver performance. The newly improved close-ratio 6-speed manual gearbox includes the world's first synchronized down/ up shift rev control system, which allows drivers of any skill level to experience perfectly smooth gear shifts every time. The "SynchroRev Control" function automatically adjusts engine speed when changing gear to the exact speed of the next gear position, essentially "blipping" the throttle to smooth out any down/up shifts.

Pontiac Solstice Coupe, 2009

Pontiac Solstice Coupe

The making of a coupe
It is a modern sports car with classic lines. The roofline has a "fastback" shape with stylized "rails" that run from the front of the roof to the rear, culminating in a stylish and functional ducktail-style rear spoiler.
The coupe's roof is fixed aft of the B-pillars, with side windows and a rear liftglass for access to the cargo area. The roof panel is easily removed from the passenger compartment, and an optional soft roof cover stores in the cargo area.

The Engineering the design
Despite its dramatic new look, engineers made only minor structural changes to create the Pontiac Solstice coupe. The rear fenders and rear fascia are the same as those on the convertible. New taillight assemblies flow more smoothly into the tapered roofline.
The sleek lines of the new roof give the car a fresh appearance, only minimal changes were made to the body structure - it's a great example of building on an already solid foundation.

The Lightweight structure
The roof's structure was strengthened with additional support elements, including an aluminum roof bow attached with aluminum brackets. The bow and brackets are stiff, low in mass, a design feature that pervades the coupe's overall construction. The roof includes a lightweight sheet molding compound cover affixed to a rigid aluminum frame for additional lightweight support. A lightweight magnesium roof panel frame weighs just 31 pounds (14.2 kg) and can be removed by one person. The cover is also made of sheet molding compound.

The Interior
Much of the coupe's interior remains the same as that of the convertible. However, the area behind the seats was redesigned for easy access to the cargo area, and a storage tray was mounted directly behind the headrests.