Quote:
Originally Posted by fliprayzin240sx
A good rule of thumb...for every 100hp you make over stock, you go up one heat range (colder plugs). So the question is, what turbo are you running? For the most part, most folk upping the boost on stock turbo or even upgrading to GT2871Rs, usually run 7s gapped down to .028.
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This!
That boost vs. heat range table sounds like a load of shit....you don't NEED heat range 9 plugs for 20 psi.............I use 7s and every time I pull them out, the band on the strap is perfect.
No need for iridiums, literally a complete waste.
Many of us with SRs in the 400hp range with 2871Rs and 20ish psi of boost are running:
NGK BK7RE or BP7RES (or something close to that.....)............basically they are copper plugs that cost about 2-3 bucks apiece, gapped down to 0.028-0.032, depending on how good your ignition system is.....
They are cheap enough to just replace every oil change.