I run TR7 iridiums @ .040 gap. I would NOT use a stock heat range plug and gap in this application.
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My plugs looked great when I pulled them out after 250 miles. You could probably get away with a TR6 but I doubt you'd notice much change between a 6 or a 7. Probably gap them .035-.040. I had mine at .035 in those first 250 miles.2015 Silverado
Originally posted by JoeliusZ28If you need 6 and half grand to break your tires loose you shouldnt be attempting a holeshot.
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Why two steps colder? Rule of thumb is a step per ever 100hp over stock I doubt he would need a 6.Doing less with more
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I use TR6s in my car - i had better luck with them than TR55s-Joel
1995 Z28 M6 - AI226/234 - autocross ricer
1984 Scottsdale K10 - 305/4bbl/4spd
WTB List:Midwest Chasis DS Loop
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Im easily 100 over stock, sounds like john will have a similar setup. Remember LT1s pickup like 400 horsepower from just headers-Joel
1995 Z28 M6 - AI226/234 - autocross ricer
1984 Scottsdale K10 - 305/4bbl/4spd
WTB List:Midwest Chasis DS Loop
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Originally posted by DETROITMUSCLE View PostI'm still waiting to hear Ricky's logic. I personally run a TR55 and my car makes 180hp more than when it was stock. I would feel fine going to a 6 range plug I just haven't yet.2015 Silverado
Originally posted by JoeliusZ28If you need 6 and half grand to break your tires loose you shouldnt be attempting a holeshot.
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Originally posted by Boost Addict View PostTheres no real logic behind it. My car had TR6s when it was a bolt on car and ran just fine and the plugs looked good. And as I stated when I pulled the current plugs they looked great, so I will continue using this heat range. I don't go by rule of thumbs, I go by what works for me.Doing less with more
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Originally posted by DETROITMUSCLE View PostI don't disagree with you running that plug I just don't see a tr55 being harmful in his application. I would like to have seen your plug when you pulled it, was it shut down right after a WOT pass? how many miles were on them? I'd be willing to bet you looked at the plug and could not really see much of anything about them aside from whether the ground strap was still exsistant and if they had oil on them. You can't conclude anything from a plug that has seen excessive idle time. Mike is right as long as they aren't fouling they probably aren't hurting having a colder plug but it also doesn't necessarily make them ideal for the application either.2015 Silverado
Originally posted by JoeliusZ28If you need 6 and half grand to break your tires loose you shouldnt be attempting a holeshot.
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