I should add that I assumed you would be satisfied with very slow acceleration. If not, you will require a larger motor with more torque. To give you a an idea of what is required...my car has about 1200 ft-lb torque at the wheels in first gear (about 90 ft-lb motor torque) and accelerates at 6 mph/sec in that gear. This would give a 0 to 60 mph time of 10 seconds, but of course the car won't go nearly that fast in first gear, speed is around 35 mph with the motor at 7500 rpm. I don't drive at that speed in first gear because it is hard on the transmission, and also note that max rpm for a 8 or 9" series DC motor is about 5500 rpm (mine is AC). In addition to a larger motor for direct drive, you would have to put a lot of current through it to get more torque, so would require something like a Zilla motor controller which gives 1000A. Even then a 9" motor with Zilla will give around 240 ft-lb motor torque I think, which would give about a fifth the wheel torque my car has in first gear, so if used in a vehicle the weight of my car would give about a fifth the acceleration rate. You would do much better acceleration-wise if you could add a fixed ratio gear box, or a manual transmission from another vehicle.
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