I have a 15t on it know . what would you recomend ?. I got beat by a stinkin 9L last weekend . We used GPS i topped out at 31.7 while skellyo's mbx5 & 9L went 41.3 .
No, no, no...it was 43.4mph
Although, I do believe the MBX5 is going to be torn down here shortly and donate its MM ESC to the CRT.
I would say that the motor should make plenty of torque, just gear it up until something gets too hot! Keep an eye on the temps and you should be ok. I see no reason why 18/36 will give you any issues. You just have to make up for the lower motor speed with higher gearing. Not the best way, but most certainly cheaper than a new esc and batteries. Now if you were trying to get 50mph out of that setup you may have issues, but 40mph sounds realistic and definately do-able.