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Audi’s 544 hp V10 diesel quattro concept averages 30 mpg; integral steering

Audi unveiled the V10 TDI diesel nanuk quattro concept show car prior to the the IAA in Frankfurt. The 5.0-liter diesel engine produces more than 400 kW (544 hp) and delivers 1,000 N·m (738 lb-ft) of torque from 1,500 rpm. With acceleration from 0 to 100 km/h (62 mph) in 3.8 seconds, and top speed of 305 km/h (190 mph), the nanuk quattro averages fuel consumption of 7.8 liters per 100 kilometers (30 mpgUS).

The newly developed V10 TDI is installed longitudinally in front of the rear axle—and can be seen through the large rear window. The engine’s twin-turbo register charging unit is controlled via the Audi valvelift system (AVS). The common rail system operates at an injection pressure of 2,500 bar. A beefed-up seven-speed S tronic located behind the engine transfers the torque to a specially designed quattro drivetrain.

Audi nanuk quattro show car. Click to enlarge.   The TDI engine can be seen through the rear window. Click to enlarge.

Thermal management with separate cooling loops and the steplessly regulated oil pump contribute to the relatively low fuel consumption.

The Audi nanuk quattro concept has a curb weight of around 1,900 kilograms (4,189 lb).

Double wishbones guide the show car's 22-inch wheels, which are shod with 235/50-series tires up front and 295/45 at the rear. The carbon fiber-ceramic brake discs can withstand high temperatures and are extremely abrasion-resistant.

The adaptive air suspension with electronically controlled dampers features the next generation of technology from Audi. The driver can manually adjust the ground clearance of the Audi nanuk quattro concept in three stages: normal; 30 millimeters (1.18 in) lower; or 40 millimeters (1.57 in) higher. The system also controls the level of the body itself based on driving speed and the predictive route data supplied by the navigation system. On the highway, for example, the body remains lowered even when the Audi nanuk quattro concept is moving slowly. It is automatically raised when turning onto a gravel road.

Another technology highlight of the show car is the integral steering, which resolves the classic conflict between dynamic handling and stability. The system combines the proven Audi dynamic steering at the front axle, which among other things can intervene at the cornering limit for enhanced stability, with supplemental steering for the rear wheels. Separate actuators activate the two active track rods.

When the driver steers at low to moderate speeds, the rear wheels turn up to nine degrees in the opposite direction of the front wheels. This shortens the wheelbase virtually by around 100 centimeters (39.37 in), reducing the turning circle to roughly 10 meters (32.81 ft). Handling also becomes more agile. The Audi nanuk quattro concept turns in even more eagerly and is essentially neutral in corners.

At higher speeds the system turns the rear wheels by as much as 2.5 degrees in the same direction as the front wheels. This extends the wheelbase virtually by around 140 centimeters (55.12 in) for better stability.


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