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Old 01-29-2007, 11:26 PM   #1
Digitalfiend
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Member#: 54823
Join Date: Feb 2004
Chapter/Region: E. Canada
Location: Whitby, Ontario
Vehicle:
2008 STI
DGM

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; 01-29-2007 at 11:34 PM.
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Old 01-30-2007, 03:58 AM   #2
Engmus
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I've been running the Denso Iridium one step colders for forever now. No problems, no CELs, no Misfires. Just a steady, clean idle. check the gap and you will be fine.
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Old 01-30-2007, 02:08 PM   #3
Digitalfiend
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Default

Quote:
Originally Posted by Engmus View Post
I've been running the Denso Iridium one step colders for forever now. No problems, no CELs, no Misfires. Just a steady, clean idle. check the gap and you will be fine.
Thank you for the reply.
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Old 01-30-2007, 07:26 PM   #4
Rexwagon03
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Default

Yep same here. denso iridium one step colder. i have a stage 4 wrx. i have had no problems.
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Old 01-31-2007, 11:59 AM   #5
Snitt
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I have run NGK platinum one step colder plugs for about 30K miles now with no issues. They have survived the cold Ohio winter and hot Ohio summer.
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