[RC-Monster Mike]

The UBEC is a "nice to have" more than a "need to have" on 12 cells. The real problem is that the motor is too hot for the application/gearing, as mentioned before. In order for the car to get to the speed it is geared for, it draws LOTS of amps! This heats things up a lot and will significantly reduce the amount of cycles you get on your batteries. If you want your car to go 60 mph, use more cells and a slower motor and you won't have nearly the trouble you are having now. You will also get a better runtime. You could even use smaller gp2200 cells (18 of these would only be a little heavier than 12 of the larger cells) and you would get cooler running, a longer runtime and more power(with a slower motor of course). Adding fans to your current setup is kind of a band aid. It will work, and may even prevent the thermalling, but it only covers the true problem (too hot of a motor/too tall gearing).