I was wondering if you've tried that 3.8 motor in a Z-car? I bought the highest end motor for the Z-car that Atomic Toys makes and my friend just a bought a clone that has a faster motor!
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Black Z-Car
3.0 Motor
6:1 Gearing
0-10' in 3.2 sec.
My friend runs the 3.8 peopel are selling on ebay in his z-car no problem! Fast like heck but cornering on track is definatly hectic to say the least :P