I didn't do too much testing this past weekend. I kept the 6.5 gearing. But I changed my profile from 0/10/12/4 to 0/10/10/1. The air temp was high 80s to low 90s F. Track temp was around 120~130° F. My TP 17.5 with Green rotor had a temp of 160~170° F after a 6 minute qualifier on a 15~16 second lap technical parking lot track. For the main I went with 0/10/12/1 with same gearing and ended up with temps of 170~180° F. Motor timing stayed at 15°. When doing this setup, always practice and check temps at the 2 and 4 minute marks so that you don't fry anything. Oh, I wasn't running a heat sink or motor fan either.