cheXmiXB

i have a greddy supercharger and im goin to replace my spark plug soon and im going to use ngk iridium 1 step colder. BKR6EIX. i used it before and i think i gapped to .034. i did that gap because i found couple post on using it... but on the manual it suppose to be .031 but since im FI, im not sure what gap i should do...what do you people recommended, i took out the spark plug to check the gap now, 1st is .035, 2nd is .034, 3rd is 0.35, 4th is .035. lmk thanks

SRTSVT

.35 sounds pretty good. Going down to 30 seems pretty low, I dont know if you can monitor knock but if you can I would try to keep as large of a gap as possible without detonation.

lazermike

Rule of thumb where spark plugs and higher than normal cylinder pressure is concerned. Gap them tighter. I would go for mid 20's, they are going to burn bigger anyways. It makes it much easier for the plug to do its job when the gap is smaller. If someone tells you otheriwse, run away.