RE: Volcano EPX motor and set up question
sounds about right.
You will certainly need to gear down with the higher RPM motor.
It will spin faster, but not have the same torque as the stock motor. Thus, gearing down allows the motor to get the truck moving and still attain a higher top speed.
And in many models, going 2 teeth below the Turn # of the motor works well.
But dont take anyone's word for it. Get a temp gun. If the motor gets above 160 then I would gear down.
If you are going to stick with brushed and try for more speed, then a heat sink and fan are good ideas.
It would cost about $80-$90 to go brushless. This would add power/speed without the need of messing with gearing.