Interesting. I'd like to do something like this, but instead I want a motor mounted to each tire via a reduction gear with a beefy generator supplementing power from the batteries. Ultimate rock crawler, no diffs to catch, no axles to rub. Never have figured out why HMMVs are one of the few that use gearing at the wheel to gain clearance. Cheap no, but extremely effective.
KERS would be pretty awesome, but when I need 4x4, I tend to need it, so using it for short stints like a race car wouldn't work.
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