GP82 Posted March 1, 2015 Share Posted March 1, 2015 My motor is currently running 20.5 psi boost pressure with NGK iridium grade 7 plugs. I am soon going to tune for 22 - 25 psi. Is it a good idea to go to grade 8!? (colder plug) Quote Link to post Share on other sites
DevonGT Posted March 1, 2015 Share Posted March 1, 2015 Grade 7 should be good enough. Quote Link to post Share on other sites
mikey4410 Posted March 1, 2015 Share Posted March 1, 2015 best speaking to the "big boys " on these high power turbo setups. I have heard once or twice its a good idea in your situation. :-D Quote Link to post Share on other sites
DevonGT Posted March 1, 2015 Share Posted March 1, 2015 I'm running 23 psi on copper plugs and never had a problem Quote Link to post Share on other sites
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