What is the maximum spark plug gap I can get away with running 20psi overboost and holding around 16ish? I have almost 275bhp and 300lb.ft torque.
I had closed them to 0.6 a while back as I had a problem and wanted to eliminate a misfire. I just changed it to an optimistic 0.9mm and I;m getting a very slight misfire at full boost. Spanner light came on for a bit - I assume this was emmisions based. It went out a few miles later.
I'm assuming 0.8mm would be fine, but wondering what everying else runs.
Spark plugs are NRK Iridium BKR6EIX.