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Old 05-22-16, 04:16 PM   #1
AdrianSTi28
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Cool Sparkplugs

Car: 2011 Sti
Miles: 34800
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Hi i wanted to ask if i should install NGK one step colder sparkplugs. I am currently on stock plugs. Also do NGK plugs come pregapped? Any input would be great.
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Old 05-22-16, 05:51 PM   #2
UrdnotWrexSTi
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Default Re: Sparkplugs

I think the basic rule for colder plugs is 1 step colder for every 100whp over stock power. I'm currently running 1 step colder and pushing 450whp right now and everything went fine with my tune.
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Old 05-22-16, 06:39 PM   #3
mheyman
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Default Re: Sparkplugs

Pretty sure it's 1 step per 75/hp over stock (not whp)- for track (high rpm use). Then for DD more conservative. I'm close to two steps, but run only one - similar to UrdnotWrexSTi.
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