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Old 01-30-2007, 12:26 AM   #1
Scooby Specialist
Member#: 54823
Join Date: Feb 2004
Chapter/Region: E. Canada
Location: Whitby, Ontario
2008 STI

Default One-step colder plugs

I'm thinking about replacing my spark plugs before my HPDE/lapping season begins in May and, now that I've gone AP stage 1, I was wondering if I should consider the NGK one-step colder plugs.

Here is my problem though: I've read so many differing views on whether one-step colder plugs are worth it or even make an appreciable difference on a near stock car. From what I've read with one-step colder plugs, they can help with detonation when running the car at higher stress levels (like road racing.)

Most people I've talked to say that the NGK one-step colder plugs would be OK and somewhat beneficial for a stage 1/2 car. Unfortunately, to confuse matters for me, a tuner commented that he has had nothing but problems with iridium plugs on modified cars; specifically poor running, misfires, etc. Firstly, I find this a bit strange, since the STi comes with iridium plugs. Secondly, he mentioned that he's personally seen copper plugs produce more power.

The one clear point he did make (and I somewhat understood) is that the NGK plugs are gapped to .030, while the stock plugs are gapped to .028 (or .026.) Will this be something that I need to be concerned about? Can anyone help clear things up for me?

Thank you in advance.

Edit: I'm in the process of reading through the FAQ and links to STi related info.
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Last edited by Digitalfiend; 01-30-2007 at 12:34 AM.
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