Hi I am currently running 4s with the motor I just ran it again this afternoon. Loads of torque really smooth. I have geared up again 1 tooth to 14 / 44 and I think it may even go to 15. The motor is so cool nothing like the standard motor for temps. I have been a bit of a Giunea pig for my friends who are all now going the same way.
New project home made chassis to get the weight down further keep in touch.
NC