i tried an 35/48 850kv outrunner with the shaft trued down to 3,2mm to fit stock 48p piniongears.
and i got 1,5min runtime Before the top two gears in the center gearbox was destroye :) this motor's got some serius torque

i changed back to stock motor and put it in a spare gearbox that i had.
so i have to use this motor in a nother rc-car lol.