Realistically, you haven't given enough information and your question is too vague for anyone to be of much help.
And there is no pat answer, or magic dust to sprinkle on your car, to increasing traction.
But the obvious starting point is to ask the fast guys at the track you're running at, for advice, as their's is going to be more relevant than anything anyone here can offer.
Otherwise, my advice would be to go to the set-up threads listed above ^,
http://www.oople.com/forums/showthread.php?t=1493
http://www.oople.com/forums/showthread.php?t=18719
or this database >
http://www.petitrc.com/setup/losi/Se...TwentyTwo.html
> find someone's that races on a similar surface to what you're racing on, and then use it as a baseline and adjust from there to meet your own personal preferences.