My son and I have been working on an electric racing kart for a high school competition.
We got it going the other day for the first time and hit 34 mph on our 35 mph gearing. For the competition it will be geared closer to 45 mph.
It uses a Mars ME0909 motor, Alltrax SPM 48400 controller and 3) 12V batteries in series for 36V. 75# of batteries and 25' of cable.
Still need to finish a roll cage for it.
Jay