it depends on a lot of factors.

head shims, nitro content , altitude etc. are you using the suggested os tuned pipe?

at sea level we actually lengthed the pipe by about 20-40 mm with an apc 17-12 and ran 20%nitro fuel with a straight 20% cool power oil mix. i think from memory we also ran one extra thin head shim as well.

it really is sometimes quite frustrating []experience to set one of these up properly but in the end if it works, the results are definately worth it.


aerowiz