Taubr Unit

iTrader: (32)

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.

RAACCR

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.)

Taubr Unit

iTrader: (32)

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

BuffJoeyD

iTrader: (2)

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.

Taubr Unit

iTrader: (32)

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

Lonnies Performance

iTrader: (16)

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.

Taubr Unit

iTrader: (32)

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

Taubr Unit

iTrader: (32)

some food for thought...

Gregory

iTrader: (4)

The below picture of my LS2-402 TR55 plugs on E85 after 3,000+ street miles. Just an accurate tune.