hi mate depends on boost ur running i am only running 7 psi at WOT my afr is about 11.2 at the min


i would say 9 is far too rich and chance suffering the performance as you are putting in far to much air for the amount of air

i would put it bk to about 11.+ even cars with big nos kits only run 10.5.1afr so 9 is basicly killing your power but giving you more protectin against knock/det as you are slowing down the burn so the fuel cools the cylinder

start at 10 and lean of as much as you can the retard the timing if you can by about 3-4 degrees

hope this helps
tommy