Interesting!......heres another feature on ther Williams Hybrid Power website:
http://www.williamshybridpower.com/n...-by-audi-sport
they state the flywheel will now spin to a maximum of 45,000rpm for Audi.......which is more than what they used to run the porsche system at (36,000rpm max).......so it would appear to be operating harder than before......when rated at 36,000rpm it could store up to 680KJ (0.68MJ) to be re-applied in a single event.......so the capacity of this thing is not massive, pro-rata that works out at 850KJ (0.85MJ) maximum storage capacity @ 45,000rpm