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Old 04-16-2012, 02:14 PM   #1
04wrxwagon805
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Member#: 279601
Join Date: Apr 2011
Location: Santa Barbara
Vehicle:
2004 Wrx
Silver

Default Please help Colder step spark plug or stock heat range plugs??

I was going to order one step colder spark plugs today through rallysportdirect and the sales agent told me to stick with my stock heat range ngk plugs bc one step colder is as he put it

Tanner S.: Generally one step colder is only recommended by NGK when you are making 100+HP over stock, if you use a colder plug and aren't making enough power over stock then you won't get full combustion and it could make the vehicle produce less power


I have headers uppipe downpipe and tuned with a cobb AP
My question to the forum is should i remain on stock spark plugs or should i go one step colder? thank you in advance
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Last edited by 04wrxwagon805; 04-16-2012 at 02:52 PM.
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Old 04-16-2012, 03:06 PM   #2
04wrxwagon805
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anyone? would like to order my sparkplugs today just want to make sure im getting the correct parts for my car
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Old 04-16-2012, 03:39 PM   #3
atomicfire
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2005 STi
OBP

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I'm stage 2 protuned and I have one step colder plugs. Hasn't hurt anything, car runs same as normal. Heat range for a plug determines how much heat it conducts to the cylinder head, not how hot the spark is. Colder plugs conduct more heat to the cylinder head.
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Old 04-16-2012, 03:39 PM   #4
atomicfire
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2005 STi
OBP

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I'm stage 2 protuned and I have one step colder plugs. Hasn't hurt anything, car runs same as normal. Heat range for a plug determines how much heat it conducts to the cylinder head, not how hot the spark is. Colder plugs conduct more heat to the cylinder head.
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Old 04-16-2012, 04:06 PM   #5
fastnoypi
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use the same range plugs you are tuned for
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