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What plugs ,what gap ,what boost ??any problems

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Old Jul 14, 2009 | 02:29 PM
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Default What plugs ,what gap ,what boost ??any problems

I am running ngk tr6ix but likely going to tr8ix shortly. I seem to have a wot issue. My plugs are pretty new but did have some rich problems so maybe they are fouled up. I gapped them prettys sure at .028 or .030. Don't think its park blowout but when I go wot the car machine guns when the boost starts coming up.


Don't want to get into the copper versus iridium debate have been using iridiums no problem for years in my dsm cars.

So would like to know what plugs your run and what boost and what gap for comparison reasons.
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Old Jul 14, 2009 | 02:34 PM
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I run ngk tr6's at .025 I was having some trouble with the engine cutting out but I have since did the .025 gap & increased my dwell time some. It appears that it has cleared up.
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Old Jul 14, 2009 | 03:27 PM
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NGK R5724-9 Stock # 7891 Gapped at .030

15 psi boost + 50 shot of nitrous

1 set of plugs last all summer long
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Old Jul 14, 2009 | 03:28 PM
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Originally Posted by code4
I run ngk tr6's at .025 I was having some trouble with the engine cutting out but I have since did the .025 gap & increased my dwell time some. It appears that it has cleared up.
2nd that, dwell time, although for most a last resort could be the problem.
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Old Jul 14, 2009 | 03:30 PM
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I run the NGK 7317's (#8). When I first put the car together I gapped them at .035. I was blowing out the spark by 5500 RPM. I pulled them out, regapped them to .027 and haven't had an issue since. On my previous nitrous setup, I ran the same plugs and was running 10.2x in the 1/4 on motor with them. I put #6's once just to see and they made no difference.
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