spark plug gap

[Phoneguy]

I'm using Denso "iridium" plugs that are factory gapped at .040 and I am using at the factory setting. According to Denso the iridiums take approx. half the voltage to fire as standard plugs and withstands heat well.

I am running 12/14 psi of boost thou with pump gas and the car has run 10.80's with the working air off. So it's making some power and the car has not missed yet with that wide of a gap. If I were to push the boost up to the low 20's I would close the gap to .035/.032 to start off with to be safe. Car runs clean on the street with the TT street chip.

At that low of boost I doubt you will see an issue with an .040 gap but I would not push it.

 

[Phoneguy]

wow, .025

i would open them up to .028 and see if it starts to have issues. .25 might be hiding/masking a ign problem

Why open them up when it is already running great.

 

[wbrophy]

Why open them up when it is already running great.

Because it "may" run even better!! i.e. a more complete combustion which would create more "POWER" and a cleaner burning engine.

 

[gnpoweredrail]

I might play around with it but my down pipe is only a foot and a half long so I can see just by looking at the pipe how clean its running.