I was trying to remember the stages of Vego 600 modification that Fetcher posted a couple years ago but don't remember the details.
I have a vego 600 which I've been fiddling with for a couple years. It came to me as a bare frame around the time the Vego corporation died. No controller, no body panels, but it did have the stock wheels and motor. I finally have it set up so it's usable for my commute. The controller is a 4QD Uni-8 running at 36 volts. Essentially I'm running with the 36 volt modification Fetcher described long ago ... the stock motor, running at 36 volts, and the controller in question is rated for a max 80 amps.
Note: the stock motor is rated for 24 volts 500 watts. Clearly with this setup it's being overdriven by a bit.
It takes off pretty good but it's not a scortcher. So the speed demons here might not be happy with it, but I'm satisfied.
The concern... I had intended to check the motor temperature after my run this morning but forgot until about 10 minutes after stopping. At 10 minutes post-ride the motor was still rather warm, indicating it's getting very warm during the ride. The ambient temperature is around 45-50 degrees F.
What I don't remember is whether Fetcher recommended adding a cooling fan for the 36 volt modification or for the 48 volt modification. I know his Vego 600 is running at 48 volts and has a cooling fan.