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Old 03-04-2012, 07:21 PM
MCSL MCSL is offline
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Location: Nor Cal
Join Date: Jan 2005
Posts: 2,598
Mein Auto: 330i
The R18 e-tron becomes a four-wheel-drive car within certain limits laid down in the Le Mans rulebook. The regulations allow 500kJ (approximately 70bhp) of stored energy to be transfered to the wheels between two braking 'events' at speeds above 120km/h (75mph).

The rules allow energy retrieval on only one axle. The advantages of choosing the front wheels include improved traction and greater efficiency during the recovery process.

Audi has chosen to use a flywheel or accumulator for energy storage rather than batteries or the super-capacitors favored by rival Toyota.

Christopher Reinke, Audi Sport's technical project leader LMP, said: "A high power density is crucial during energy recuperation. The accumulator must be capable of absorbing a lot of energy within a few seconds during the braking stage."

The flywheel has been developed by Williams Hybrid Power, which also produced the unit for Porsche's 911 GT3-R Hybrid.

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