According to Paolo Catone the 908 HDI-FAP didn't have something special on their suspension compared to Audi, but they did a lot of development there.
The main secret was a J-damper and a pretty soft rate for spring/dampers which was the reason the car was better running over the curbs like the Audi.
For this you have to design a car which is not pitch sensitive and you need a aero which is stable even if the car changes it ride heights.
A soft/spring damper ajustment was also the main secret of the 905 Group C as the rear diffusor was designed to stall at a certain point reducing downforce and drad on the straights and running also better over curbs than the pretty stiff rivals.
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