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Duncan, do you have a transmission in the car? If so, are you using all the gears? I stopped using 1st gear because there's enough torque to start in 2nd or even 3rd. If that's the case, you could re-gear the final drive (differential) so that you have the same torque in 1st as you currently do in 2nd, which would give you an extra gear to use at the high speeds. If you just have a single speed (no transmission), you could still just re-gear it and trade some low speed acceleration for top speed. Of course, that low speed torque can be made back with higher motor current!
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