Flywheel system details:
Porsche 911 GT3 R Hybrid - Flywheel Formula
Quote:
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The rotor inside the KERS module is capable of rotating up to 40,000rpms, storing the kinetic energy of braking. The energy is stored for 6-8 seconds, during which time the driver can access it to gain an extra power from the 120kW of motor boosting the engine's push to accelerate the car. This results in both faster pickup speed and fuel savings, both very important to GT racing.
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The article that info came from makes (I believe) a basic mistake in describing regen though. They say that the axle motors "rotate backwards to become generators" under braking.
Um, nope! Motor and generator functions happen in the same direction of rotation.