Audi R18

As Audi shows off the new R18 e-tron Quattro, it's proving that history can be fun. In a new video, the automaker traces the origins of its 2012 Le Mans entrant back to the original Quattro that abused the space-time continuum in Group B rallying.

This isn't exactly the true return of Quattro, however, since four-wheel drive isn't allowed in LMP1. However, according to Le Mans rules you can have "500kJ (approximately 70bhp) of stored energy to be transferred to the wheels between two braking 'events at speeds above 120km/h (75mph)."

That's where the R18 e-tron's regenerative braking steps up, its flywheel unleashing stored energy at the front axle. Check it out in the video after the jump.