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Message: <blockquote data-quote="shiroitenshi" data-source="post: 1840407" data-attributes="member: 27518">Usually 7.. even the most powderful (ROFL!) engine here goes 8 at most.turbos are another matter.. there's one here using 10.. (O_o)Checked a couple of sites... the heat range is related to the combustion temp increase (due to compression ratio and turbocharging) higher compression ratios usually require better fuel (I think you know that already) and colder plugs.Seems to be true, as the car running 12.5 compression ratio (est, never calculated properly, since the piston says 12.5, so assuming other parameters are correct, yes it has 12.5 CR.That one is using no. 8 plugs..Other than that.. everyone else uses 7... except for that crazy turbo evo with no. 10 plugs. I think you guys know that car when it was in Links, when it was tuned by a Japanese fella along with some Skyline and others. And if you do, you'd probably know how much whp it makes. Monster!If you're thinking why not run no. 8 straightaway, it's because at colder temps, the spark is so poor, you'd foul the plug.. A colder plug resists the buildup of heat at the tip, to prevent pre-ignition.So.. what kind of compression ratio you're getting? I still think 7 is the usual setup, unless you've milled the head for compression, and it's in the high 12 CR range.</blockquote>

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