its all in the tires.... they pick up speed becuase of the tires they use more so then the motors.... if ur using PVC dont expect alot of speed.... if u can find ABS pipe its softer and still drifts and u can pick up some speed.... the simple trick is painters tape... or masking tape... put a good 8-10 layers on each tire... good as gold till it wears off lol.... try it out it does work