E85 tuning questions

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Apr 6, 2012 | 12:22 PM

Taubr Unit

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E85 tuning questions

Im having my truck tuned next weekend and wondering what other tweaks I can/should do before hand. I'm gonna have it tuned on e85 so I'm wondering if a better plug runs better with e85 or not. Everyone with ls1's use ngk tr-55's but does e85 like a hotter or colder plug or doesn't matter? My truck is a 2011 silvo with a 5.3 with CAI, modded air box and catback with a xr-1 muffler.

Apr 6, 2012 | 04:21 PM

RAACCR

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NGK 3177 BR6EF Non-Projected Tip

Gap it so the ground strap is square with the electrode.
(Might be a little tighter than you're used to, but the plugs work best when the gap is square.)

Apr 6, 2012 | 04:38 PM

Taubr Unit

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Now how will that plug work if and when I need to switch back to 87 oct gas once in a blue moon?

Apr 6, 2012 | 06:50 PM

BuffJoeyD

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Be interested in how well the stock fuel pump holds up to long term E85- Is your truck a flex-fueler already?. People go ahead and give me crap, Run Champion copper plugs gap at .45+ Hope your tuner is good.

Apr 6, 2012 | 07:08 PM

Taubr Unit

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Ya it's a 2011 flex fuel, has 36 lb injectors from factory to work with it. I may just stick with the stock plugs though if there's no hard evidence for the extra work

Apr 7, 2012 | 08:47 AM

Lonnies Performance

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The type of plug is less important than the proper heat range.

Even though alcohol burns cooler, leading one to believe it needs a hotter plug, it burns cleaner, leading to less fouling/carbon buildup problems.

Since you are normally aspirated, your current plug will likely be OK.

Apr 7, 2012 | 09:11 AM

Taubr Unit

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Thanks Lonnie, pretty much what I was thinking. Not gonna spend the time or money on a different plug. I would assume gm put a plug in anyways to work with both gas and e85..... I hope at least, lol