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The Audi R18 is a Le Mans Prototype (LMP) racing car constructed by the German car manufacturer Audi AG. It is the successor to the Audi R15 TDI. Like its predecessor, the R18 uses a TDI turbocharged diesel engine but with a reduced capacity of 3.7 litres and in a V6 configuration. For the first time since the 1999 R8C, Audi's Le Mans prototype uses a closed cockpit design. The R18 is also the first racing car from Audi to feature hybrid power.
The R18 e-Tron Quattro is a hybrid version of the R18 ultra, with a 500 kJ flywheel accumulator system designed by Williams Hybrid Power, two 101 PS (74 kW; 100 hp) Bosch Motor Generator Units driving the front wheels with water-cooled integrated power electronics, providing the car with four (quattro) wheel drive, and a smaller 58-litre fuel tank. The quattro system, as per the regulations, is available only at speeds above 120 km/h (75 mph).
The E-Tron has six automatic modes that are driver selectable on the steering wheel. The modes manage engine mapping, short bursts accelerating from corners, quattro four wheel drive, wet weather, etc. Allan McNish said "I don't have to press a button ... It does it automatically ... It is like traction control."
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