poss gearing advise plz

[zoaman]

i am running the tm4 with centre gear.im using a 80t spur x 8.5t motor 120a speedo all turned down for indoors mostly carpet but some slippy.i tried using a 25t pinion but the motor was getting on the hot side.
motor seems 55.(i know thats not hot but,shell n chassis was all hot)
or is it a air flow prob???
esc 35
i am using 30k oil in the centre too so is that too light and causing spin up?
i have another car setup
9.5t x80t 26 pinion with 50k centre and this runs nice temps

[Pitman Ed]

It's not easy without knowing the track. but I'd probably run 300 oil in the centre diff, and a 23 pinnion. Motor will get hot indoors on carpet, and more aiflow can only help.