Thanks a lot for all that good info backfire!!
Man I knew something had to be wrong on my speed calculations, couldn't be good on the first try heh
Good to know I have some options to manage to fit a slipperential with a bigger spur. I think I might order one of those sooner than I think, they look soooo *butter*
And now thanks to the both of you I am sure on where I have to place my ESC :) I'll start looking around for a small cf servo/gyro plate and some small posts. What holes did you use for your posts? The engine holes and/or the ones for the receiver box?
EDIT: With the right gearing now I get 35k RPM on a 1900kv motor on 5S and a 36.5mph top speed with a 14T pinion. Sounds good :)