I pulled my plugs out the other day and changed them just to be safe. Here are some pictures of one of them. I would say this was the worst in the group. What do you guys think?
The old plugs were gapped around .040 and I gapped the new plugs between .032 and .035. Is that a safe amount of gapping for 6.5 lbs of boost? I plan on going to around 8 lbs of boost and calling it good.
Last edited by 99LS1SS; 05-24-2010 at 10:20 AM. Reason: typo on plug gap
2016 GMC Sierra 1500 6.2L
I think your hands need moisturizer.
Run your gap around 0.035" and see what happens. It probably isn't a bad idea to gap them down a bit, though. I run 0.035" on my LS7, but it's NA with a huge cam. Your plug doesn't look that bad. It's normal for the strap to be white-ish and the rest to be black.
NGK has a decent guide to reading plugs:
http://www.ngksparkplugs.com/tech_su...qs/faqread.asp
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The coloring is not the only thing you need to look at. You need to put it under a scope of some kind to get a good 20x magnification. You can actually see microscopic balls of molten aluminum from the pistons exploding under the pressures of detonation. It amazes me that everyone just reads the color on them and does not magnify them when tuning.
That black color does indicate rich conditions under a throttle transition or medium load condition and these areas should be looked at. The porcelin being clean means that it is running pretty clean at cruise and idle (no throttle transition). I run boosted cars at about a 11.2AFR and never end up with that black ring, but I spend hours on the transitions and medium load areas. The gap at .035 is just fine. I can't see the strap well enough to tell how much timing you are running at wot and cruise though.
I am running MAF only right now but I'm seriously considering tuning the VE to help the transition.
2016 GMC Sierra 1500 6.2L
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