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I am trying to decide what voltage I want my battery pack for a diy ev mini Cooper to be. I heard that the Voltage is directed related to the top speed of the car. If I use a warp 9 motor, how to calculate what voltage is going to give me what top speed?
 

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The people selling you the motor should provide data sheets and advice on that.

Don't forget the controller is a key piece in between there, not to mention any gearing, when the question of car speed changes to motor rpm.
 
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