Thanks all for Your replies,
but I am still in the shade,[8D],there are lot's of information out there, but maybe someone has more, complete, information?
Like:
the motor (xxx) with pinion (xxx) and bearings (xxx) makes the cars going 35 km/h.
Something like this, so I can start with something, and then try on my own to find pieces to perform even better?
Or has anybody made tests with different motors etc, and produced some kind of a graph, I just can't find anything of the kind on the net.
Thanks for now, all the best,
jakob