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I remember seeing some sort of experimental differential for sale a few months back. Maybe that would provide the ratio you're looking for. A lower ratio would make the car faster, but not as quick. Is that the goal?
I think that there were some cars that used the same Borg Warner gearbox as the Roadster but with a lower gear ratio. So, it might be possible to buy a different set of gears. Maybe EvWest would know about this?
Any update on this? I'm designing an add hybrid system to go over 180mph, but don't want to damage the electric motors by running them at a higher rpm than they can handle. Tia