MUST HAVE FOR BOOST - DENSO IK22 Spark plugs

Interesting. I've been running the NGK BKR9EIX's for a couple years & never gapped them. I assumed that for boost levels between 12-15 psi, the factory gap was good. Should I regap my next set of plugs?

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Originally Posted by 1JZ_Type-S

Interesting. I've been running the NGK BKR9EIX's for a couple years & never gapped them. I assumed that for boost levels between 12-15 psi, the factory gap was good. Should I regap my next set of plugs?

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I read somewhere either on here or k20a. They say .028-.030 low boost settings and .022-.025 high boost. I running it at .025 at like 14psi right now and its fine.

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Originally Posted by BuBBaSBuBBLE

I read somewhere either on here or k20a. They say .028-.030 low boost settings and .022-.025 high boost. I running it at .025 at like 14psi right now and its fine.

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Hmm....Thats the thing though. I'm not sure where I fall @13psi. For stock internals, I know its on the high side but ignoring that fact, 13psi isn't really much. I guess I'll just gap my next set to .025 like you & see what happens

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Originally Posted by 1JZ_Type-S

Hmm....Thats the thing though. I'm not sure where I fall @13psi. For stock internals, I know its on the high side but ignoring that fact, 13psi isn't really much. I guess I'll just gap my next set to .025 like you & see what happens

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With higher boost the spark gets blown out hence the reason for the tighter gap .I run mine at .022

Quote:

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Originally Posted by 1JZ_Type-S

Interesting. I've been running the NGK BKR9EIX's for a couple years & never gapped them. I assumed that for boost levels between 12-15 psi, the factory gap was good. Should I regap my next set of plugs?

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I would suggest gapping them down a bit. It will help prevent it from breaking up at high rpm.