As I speculated back in October 2010 when I wrote about the porsche 911 gt3 hybrid their corporate cousins at audi are adopting the flywheel hybrid system for the r18. In fact when I asked Dr Wolfgang Ulrich about it the team had already been working on the car for more than 9 months.
Today audi confirmed that two flywheel hybrid r18 e-trons would run at le mans alongside 2 conventional diesel r18 tdis
http://www.popularmechanics.com/cars/alternative-fuel/hybrids/porsche-911-gt3r-hybrid-flywheel
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