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Old 04-26-2013, 10:16 PM   #7 (permalink)
Master EcoModder
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Join Date: May 2008
Location: Maynard, MA Eaarth
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Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

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Wheels only spin up to about 900RPM - so why would they need gearing? They have tons of torque already. The SIM-Drive hub motors are very efficient. Direct drive motors (with drive shafts straight to the wheels) have nearly the same efficiency, but can have *less* unsprung weight than typical, if you put the brakes inboard. The FVT eVaro did this.
Sincerely, Neil
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