Help with plugs on E85?

[stealthy1ss]

Lately my car has been breaking up under half or more throttle. The first place that I am addressing are the plugs. Currently I am running a one step colder ngk plug gapped at .33. My question is would the fact that the plug is one step colder becausing this with E85? I have regapped the plugs twice now and it still breaks up every now and then. The first time that this happened was when I was on the dyno about a month ago. The motor is fine, did a compression test and it was 210 across the board.

[CobaltSSTuner]

thats a little wierd, have you tried running normal plugs with the e85?

[WhatsADSM]

You ever try tightening up the gap at all (maybe in the .25-.28 range)? E85 is a more difficult mixture to blow through.

[stealthy1ss]

You ever try tightening up the gap at all (maybe in the .25-.28 range)? E85 is a more difficult mixture to blow through.

Yes I have. I have gone from .35 to .33.

[CobaltSSTuner]

I thought that e85 burns slower than normal fuel, which means that you need a normal or hotter plug? could be wrong though

[SSLEVO]

What kind of boost are you running? That gap seems to be far too large, you may be blowing the spark out. On my evo i was running .026" at stockish boost (19-22psi) and .022" on E85 @ 30psi.

[lilws6]

fix it and get it to gld on friday lol or just go play cod with me tonight and blow some steam off

[stealthy1ss]

I am running around 17lbs of boost. With the pulley I am running they recommend .35 with the LSJ.

[lilws6]

i say put some stock plugs in it and see if its better the 85 is a slower burnin fuel i wouldn't doubt its not hot enough

[Reverend Cooper]

i dont really think from what ive talked with Jim that that car needs a cooler plug,the higher octane so to speak would not need a colder plug for detonation purposes

[CobaltSSTuner]

I still say try putting stock plugs in and gap the plugs at .35

[SSLEVO]

That just seems like an awfully large gap. While 17psi isn't huge, it's still substantial. I would try something closer to .030

[twicks69]

Stock temp plugs, gap them between 0.028 and 0.030" if you have a good ignition system.

Check your grounds also and make sure that your ignition and alternator are working properly and not getting voltage drop under load.