Originally Posted by btrukr

Your gonna buy some pinions. You need to start were the car has some speed and make 2-3 minutes test runs. Start with the 21, and you can go up 2 teeth at a time till it makes heat in the motor. You'll need to get about 130F-140F or you'll be way hot coming off the track after a 5or6 min heat and main race. You burnt the other esc up by using the NIMH batteries and trying to gear like you can with lipo's. The NIMH don't have the amps to keep the esc cool when dealing with the load of tall gearing.