Paris Show: Audi e-tron Spyder Concept puts Porsche’s Boxster on Notice
Thursday, September 30th, 2010
One of the real live wires at the 2010 Paris Motor Show will undoubtedly be the Audi e-tron Spyder, a two-seat open sports car study with plug-in hybrid drive capable of delivering 128mpg economy and 59g/km emissions from its 300PS twin-turbo V6 TDI engine and twin electric motors.
The Audi e-tron Spyder’s low total weight of only around 1,450 kilograms, combined with the high-torque TDI and the two electric motors results in impressive performance. The car accelerates to 62mph in just 4.4 seconds, and top speed is electronically governed at 155mph.
The e-tron Spyder can combine the powerful 650Nm torque output of its TDI engine with the 352 Nm developed by its two electric motors during acceleration in a process known as “boosting.”
The intelligent distribution of power allows for optimal dynamics in every situation. The targeted application of power to the front wheels improves longitudinal dynamics while also improving lateral dynamics when cornering. This is because torque vectoring – the ‘on demand’ distribution of torque between the left and right wheels of the two axles – enables an exhilarating degree of driving precision and excellent agility.
Thanks also to its low weight, short wheelbase and perfect 50:50 weight distribution for dynamic handling, the Audi e-tron Spyder has all the drivability of a go-kart – good on bends and neutral right up to the very high handling limit.
The combination of a highly efficient TDI and electric drive also provides for excellent fuel economy and amazingly low emissions. The Audi e-tron Spyder can cover up to 128.4mpg, corresponding to CO2 emissions of 59 g/km. A range of more than 621 miles is possible with the 50-litre tank.
The open sports car can also drive strictly on electric power and thus with zero emissions over distances of up to 31.07 miles and at speeds of up to 37.28mph – an obvious benefit in urban areas.
The Audi e-tron Spyder features what is without a doubt the most advanced and simultaneously the most consistent evolution of the current Audi design language, while also providing initial hints at the design language of future Audi sports cars. It reinterprets the most important design elements that already characterized the previous e-tron concept vehicles. This also ensures the necessary formal differentiation to the purely electric-powered Audi e-tron shown at the 2010 Detroit Motor Show.
1.81 meters wide, just 4.06 meters long and only 1.11 meters in height: these are the classic proportions of an open, high-performance sports car. Compared to the coupé concept car in Detroit, the length and width have increased by 13 cm and 3 cm, respectively, to underscore the sporty aspiration of the design. This further enhanced the powerful and compact overall appearance that characterizes both vehicles and links them to the sportiest production Audi, the R8.
Due in no small part to the short wheelbase of only 2.43 meters – 22 cm shorter than that of the R8 – the body of the e-tron Spyder has a suitably stocky, purposeful stance.
In an apparent homage to motor sports, the frameless side glass surfaces taper downward toward the rear. They form a unit with the windshield, which is strongly bowed and inclined like the visor of a helmet.
Another element borrowed from race cars characterizes the bonnet: the wide central air inlet, whose curve further accentuates the dynamics of the car’s front end and provides a visual and functional link to the Audi R8 LMS customer race car. The carbon application that is mounted flush in the front and side windows and wraps completely around the glass testifies to the design and manufacturing expertise that went into the car.
The silhouette of the e-tron Spyder is characterized by a sharp, sweeping line that immediately identifies the two-seater as an Audi. The sharply tapered front end lends the Audi e-tron Spyder show car a distinctly wedge-like basic shape. The trapeze of the single-frame grille dominates the distinctly wedge-shaped front end and is flanked by two large air intakes. They serve as cooling intakes for the electric drive system and also for the TDI engine at the rear of the vehicle.
Above, the grille merges into the flat strips of the adaptive matrix beam headlight modules with their three-dimensional clear glass covers that follow the contour of the functional elements.
All light units use ultra-efficient LED technology. As with the R8 and the e-tron sports car concept cars, the trademark four rings are located above the single-frame. Beneath the trademark is the charging station for the batteries. The rings disappear beneath the front hatch, exposing not just the charging plug but also a display showing the charge state and a map graphic indicating the current electric range.
Another distinctive feature of this show car are the 20-inch wheels, that take the blade design of the first e-tron show car and refine it into a three-dimensional turbine design. The wheels combine the lightweight materials aluminum and carbon into a design that is both visually pleasing and very effective aerodynamically. The 66 individual components comprising each individual wheel of the e-tron Spyder are indicative of just how complex they are.
The flanks sport familiar contours in a new form. Unusually sharply defined edges frame the smooth side surfaces while simultaneously separating horizontal from vertical areas.
The shoulder line frames the lines of the strongly contoured wheel wells even more distinctly than in the Audi R8 and combines them with the upper edge of the vehicle body. Particularly when viewed from the back, the e-tron Spyder appears even more strongly oriented toward the road.
This impression is also reinforced by the characteristic sills with a new cut and is picked up by the spoiler and diffuser at the front and rear of the car. Carbon elements borrow from motor sports to set special accents here as well. Carbon is also used on the engine cover in the rear and in license plate and lighting frame, which also includes the air outlets below the lateral light units.
The contrast of materials is reminiscent of a race car. The essential functional elements of the chassis and the vehicle body are done in carbon, while the body as a cover sports a classic paint finish. This illustrates the formal “shell-and-core” principle that defines the e-tron Spyder particularly clearly.
Thanks to an opening in the hood, even the longitudinal TDI mid-engine is a visible technological element surrounded by matt and glossy carbon surfaces, aluminium and leather. This combination of materials links the exterior with the interior of the vehicle.
Behind the seats are two cowls that gradually taper toward the rear and also flank the opening for the TDI engine and the implied cooling fins of the engine cover. They also contain the normally hidden rollover bars, which like in the production R8 Spyder shoot up within milliseconds and lock into place in the event of an emergency.
Visual and functional references to the fundamental concept of lightweight construction characterize the purist interior design. They establish a connection between proven Audi genes and new formal hallmarks. Typical for the Audi design idiom is the reduction of the architecture, controls and information output to the essentials in favour of a tidy overall impression.
The slim dash has a curve that extends laterally into the door panels. With no need to allow for a transmission, shifter and cardan tunnel, the designers again took advantage of the opportunity to create a particularly slim and lightweight centre tunnel and convex, arching center console for the e-tron Spyder with hybrid drive. The only control element other than that of the MMI is the flush-mounted selector lever for the automatic transmission, which extends upward from the tunnel when the vehicle is started.
The cockpit of the Audi e-tron Spyder is also oriented toward the driver – a further characteristic Audi trait. Instead of the classic instrument cluster, the concept car is equipped with a large display with integrated MMI functions and flanked by two round dials. The MMI can be controlled via a touch-sensitive control panel on the steering wheel – an element inspired by modern smartphones. It can also be controlled via the MMI control unit (MMI touch) on the centre console. The steering wheel itself is clearly flattened off at both the top and bottom, in a clear reference to motor sport. Speed is displayed in digital form only. The dial instrument with information about the drive system can be chosen via the menu item “Drive.”
Besides information about the speed, the revs of the combustion engine and the electric drive, the central display also provides all of the key information from the infotainment and navigation systems.
Characteristic for the concept of the Audi e-tron Spyder is the near total elimination of switches and 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 operated by means of a touch-sensitive control panel.
The equally racing-inspired lightweight bucket seats combine excellent lateral support with comfort. Contrasting colours and stitching delineate the various zones of the interior. The colours and the high-quality materials combine elegance and sportiness.
Systematic lightweight construction is a crucial prerequisite for efficiency and range, while also being the primary foundation for exhilarating driving dynamics. The Audi development engineers drew on the core competence of the company for the Audi e-tron Spyder. The body structure is based on Audi Space Frame (ASF) technology and was realized as a hybrid construction, with the hood and numerous aerodynamic components made of carbon.
In ASF technology, the body’s supporting structure is made of extruded aluminium sections and die-castings. Aluminium panels are incorporated into this skeleton to form a positive connection and perform a load-bearing role. Each individual component of the ASF space frame is optimized for its specific task by the use of widely differing shapes and cross-sections, combining maximum stability with minimal weight. Despite the complex drive system layout with two electric motors and their respective drive systems plus the TDI engine, the Audi e-tron Spyder show car only weighs around 1,450 kilograms (3,196.70 lb).
Engine and transmission
The Audi e-tron Spyder marks the first use of a new generation of the six-cylinder, 3.0 TDI that breathes through two turbochargers and produces 300PS, a 50PS increase on the previous stage, which debuted a few months ago in the new Audi A8.
Peak torque of 650 Newton metres is unusually high, even in the sports car segment. The mid-mounted, longitudinal 3.0 TDI engine drives the rear wheels via a seven-speed dual-clutch transmission.
Another innovation is the coupling of the TDI with the electric drive of the front axle. Two asynchronous electric motors with a total output of 64 kilowatts (88 hp) and peak torque of 352 Newton meters combine with the 3.0 TDI to give the Audi e-tron Spyder the performance of a high-performance sports car. It accelerates from 0 to 62mph in 4.4 seconds. Top speed is electronically governed at 155 mph.
The drive’s characteristic is even more exciting than the abstract numbers. Thanks in no small part to the fact that the peak torque of the electric motors is available immediately, the e-tron Spyder accelerates with catapult-like thrust.
The noise level of the low-revving TDI is typically low. The six-cylinder unit behind the occupants issues a sonorously sporty growl under load, but never becomes loud – a surprising effect also present in the Le Mans-winning Audi R10 and R15 race cars, which are also powered by TDI engines.
The benefits of this special form of hybrid drive – the coupling of a high-torque, high-efficiency TDI engine with the electric motors – are by no means limited to the dynamic potential of the Audi e-tron Spyder, however. The open two-seater also sets new standards in its class for fuel consumption and environmental characteristics. The 300PS TDI enables the e-tron Spyder to cover 128.4mpg, which corresponds to CO2 emissions of only 59 g/km.
The full-hybrid Audi e-tron Spyder has also mastered the discipline of zero-emission driving. In residential and other urban areas, the driver can activate the electric drive by itself. The 9.1-kwH battery at the front of the car has enough power for up to 50 31.07 miles. And with a top speed of up to 37.28 miles, the e-tron Spyder is also able to move along smartly in city traffic.
The normal distribution of the tractive power is clearly biased toward the rear axle in accordance with the weight distribution of the e-tron Spyder and the dynamic shift in axle load during acceleration. Similar to with a pure mid-engine sports car, roughly 75 percent of the torque goes to the rear and 25 percent to the front. If an axle slips, this balance can be varied thanks to the central control of the entire drive system in combination with the ESP. The hybrid vehicle from Audi thus enjoys all of the advantages of quattro technology.
The combination of the mid-mounted TDI engine and the two electric motors at the front axle also make it possible to intelligently control the lateral dynamics of the e-tron.
Similar to what the sport differential does in conventional quattro vehicles, torque vectoring – the targeted acceleration of individual wheels – makes the e-tron Spyder 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.
The chassis has triangular double wishbones at the front axle and a trapezoidal-link rear suspension made of forged aluminium components – a geometry that has proven in motorsports to be the optimal prerequisite for high agility and uncompromising precision. 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 e-tron Spyder only has to provide energy while steering, and not while driving straight ahead.
As befitting its status, the Audi concept car rolls on 20-inch wheels with a new blade design. 245/30 tyres up front and 265/30 tyres in the rear provide the necessary grip.