what are the best spark plugs for FI

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Dec 19, 2005 | 11:02 AM

#21

Zivman

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From: MPLS/ST.Paul MN

Quote:

Originally Posted by MIAPLAYA

Well stock gap is .044 but all the Iridiums I got were gapped to .039. I did gap them down to .035 for a while to see if it changed anything...it didn't. I would run copper if the plugs weren't such a b!tch to get to. I had to replace the copper plugs on my last car too often so I'm running Iridiums on this one.

I had a set of iridiums from a local Z owner and found they were gapped to about .045 out of box. Trouble is, you really can't regap without potentially damaging the diode.

I know a friend of mine ran iridums on his MSP (mazdaspeed protege)- basically a turbo'd protege. For a while a lot of people recommended the iridiums, thats why he ran them. Since, the MSP crowd is switching back to copper, and he has also since. I know a 2.0 I4 is much easier to swap plugs on than our cars are, and that makes the iridiums more attractive for us.

Dec 19, 2005 | 11:21 AM

#22

MIAPLAYA

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From: Escondido

Quote:

Originally Posted by Zivman

Hmm...wonder where he got them from. I think they are sent pre-gapped to .044 but the ones I got from Sharif were gapped to .039 when I got them. It is a little tougher to gap them due to the electrode being more brittle but I was able to gap them fine on my car and also on my last car (Spec V).

Dec 19, 2005 | 11:33 AM

#23

Sharif@Forged

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From: Marietta, GA

I run them out of the box. They are usually gapped around .040-.042 and that works well. With Nissan's coil over plug direct ignition system, smaller gaps arent needed for FI, which is contrary to the usual school of thought.