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Old 01-02-2005, 02:52 PM   #1
Brahmzy
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Default Which spark plug for these engines?

Hi guys,

I have read the FAQ on plugs and still can't get a solid answer. I have a question for 2 cars.

My wife has a STAGE 2 2005 Legacy GT. Would a colder plug be a good idea? If so which one? Part #s? Iridium? And what do I need to gap it too?

I have a STAGE 2 2005 STi. Would a colder plug be a good idea? If so which one? Part #s? Iridium? And what do I need to gap it too?

Like I said I've searched and could not get a solid answer especially on colder vs. stock.

Thank you!
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Old 01-02-2005, 06:10 PM   #2
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Stock temp for both. Stock gap for both. Plat for long change intervals, copper for shorter change intervals, just say no to iridium.
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Old 01-02-2005, 09:38 PM   #3
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Ron....the stock plugs for the EJ257/EJ255 are iridium and iridium is a MUCH better conductor than platnium.

I have had IK-22's in my car for a LONG time without any issue.
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Old 01-02-2005, 09:40 PM   #4
Brahmzy
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I thought also that if you had Stage 2 or more that you wanted a colder plug. Is this true?
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Old 01-02-2005, 09:41 PM   #5
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....only if you are using a good bit more boost.

I run up to 22psi or so...
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Old 01-02-2005, 11:05 PM   #6
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My favorite Uncle....while you are technically correct, I must disagree.

Iridium plugs are more expensive and add zero HP.
Platinum plugs are cheaper and add zero HP.

To each his own, but I'm from the Team Food Stamps Racing crew.
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Old 01-02-2005, 11:11 PM   #7
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...actually....an iridium plug, that is electrically a better conductor, will yeild a better spark...and iridium is harder and has a higher melting point than platnium and therefore should last longer......soooooo....60k mile plugs or 90k mile plugs....you pick
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Old 01-02-2005, 11:14 PM   #8
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Quote:
Originally Posted by Uncle Scotty
......soooooo....60k mile plugs or 90k mile plugs....you pick
Don't forget that plugs like to become one with the head if you leave them in too long.
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Old 01-02-2005, 11:29 PM   #9
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Quote:
Originally Posted by OneOBS
Don't forget that plugs like to become one with the head if you leave them in too long.

...nothing a bab of the correct anti-seize won't make that issue an issue....
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