RE: Fastest brushed motor down to 10 turn
Going fast is real easy. Just buy a fast motor.
But don't expect it to be fast for very long.
There is a universal Axiom in electric RC: Speed costs.
While a 10 turn motor will indeed be VERY fast, you are going to dramatically cut the overall runtime of the truck due to the increased current draw of the faster motor. Lower turn motors also require more maintenance, more often to keep them in top operating condition.
That maintenance included periodic commutator resurfacing, brush replacement and bearing replacements. This can get very expensive, very quickly. Most hobby stores will charge $15-$30.00 for a rebuild. How of often you have to rebuild the motor depends on how often you run it.
A hot motor, such as a 10 turn is not intended as a basher motor. it is intended for racing applications, where you expect to do the maintenance.