i did send an email and change my spurgear to 66t
i will try 15/66
15/66=4.4

i need my car to get quick not high topp speed!!!

Gear DOWN for faster acceleration - gear UP for faster top speed...

when you said more speed I took as top end vs acceleration... 12/66 should still be ok...

okey but if i just need acceleration?
12/66 gets the best acceleration and gets okey topp speed?
i like when the car makes wheelis..

Try the 12/66 or buy a mmm and do backflips...

This is a Mamba Max on 4s with a 9XL

http://s168.photobucket.com/albums/u...urrent=018.flv

http://s168.photobucket.com/albums/u...urrent=017.flv

i will not buy a new motor yet.
it was not possible to change my order so i will try 12/72 or 12/70. wich gearing give me the best acceleration?

you told me "Gear DOWN for faster acceleration - gear UP for faster top speed..."
it that the spur och pinion?
will a smaller pinion help me get better acceleration?

Gear down means smaller pinion or bigger spur

Gear up mean bigger pinion or smaller spur