well a 7700kv is only supposed to take a 2 cell

the fastest motor is the 5700 kv, because of torque, and with tore and high cell count u can gear it crazy.... i sujest the 5700, or the 4600 kv if ur going to race u want it to be tame so u can stay on the track

and nicad, u from one18th? sounds familliar