[nitrostarter]

Your problem is definitely in the gearing of the motor on 5s. You're looking at 53-55mph on that setup. Not too extreme but it will heat the motor up faster and shorter runtimes should be used.

With that said, Neu has stated that their motor run most efficiently from 25-35k rpm's. 2200kv on 4s puts out 32,560 unloaded rpms. Thats why they suggested it for a 4s motor.

I've run my 8T with the 2200 combo geared 15/47, unless I miscounted the spur...lol, and she runs long and strong on the track and around the house with great temps. after a 14 minute run, my motor temps out around 155-160 everytime.

One thing you need to look at also, is on 5s, I'm pretty sure there was a lot of unloading of the wheels. When the wheels spin too easy that makes the motor spin more freely and less loaded. Unloaded motor run inefficient and create heat. Might be another reason for your motor heating up.