You seem to be geared okay. With the CO27 I'd start in the 6.90 range. I'd probably would start with a 93 spur and 29 or 30 pinion.
If you need to stick with the 83 spur then 26 pinion. This of course depends on the size of your track. On a large track I might try 6.0~6.5. Check to make sure your gear mesh is okay... If it's too tight then that might be your problem. Also check the rest of your car for any binding.
Last edited by minicooper; 07-17-2006 at 12:00 AM.