are you telling this guy right? I always thought it was the voltage that altered the speed/power. stepping up from 7.2v packs to the 7.4v lipos will make a difference. The capacity will not affect the performance, only the run time, 25c, 30c etc. is the discharge rate, this will depend on the motor wind, the lower the wind the more current it will draw, if you are running a 6.5 or 7.5 in a 2wd, 30c will be plenty, go higher for 4wd. Ultimately your motor will define the speed not the lipo pack, decide the car and motor, then choose the lipo to suit.
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