e-85 plug question

[Gravy]

For those of you that have run e-85 for some time, have you had to change the gap from when you were running gas or go a heat range warmer or colder? I've tried it out twice on low boost settings and it missfires like crazy. Not getting any counts of knock, but it doesn't seem to want to run right unless it's almost no gas, or WOT. It sputters and backfires like crazy and i'm not sure if it's due to wrong heat range, gap, or if i'm just getting spark plug blow out.

[b00stcreep21]

Obvious question.... Did you TUNE the car for e-85? I honestly don't think an afc on a stealth is going to be sufficient enough for a good e-85 tune

[Shane@DBPerformance]

Did you goto bigger injectors and fuel pump? If not, you are probably extremely lean or if you are trying to add fuel using the SAFC, then you might be hitting fuel cut.

I run a tighter gap on most E85 cars, but most E85 cars are also at high boost.

[turbotalon1g]

I switched to BPR8ES from 7s, but that tune was on the E70 junk.

[merkzu]

I switched to IKH24, 8 heat range iridiums. I was hoping to get a little more headroom from knock but I dont think it helped much if any. The stock 7 plugs worked fine


also I never regapped my plugs for e85, they are iridiums tho not sure if that makes a difference

[JET]

I was still on BPR6's at .026" gap, in my car and haven't had any issues.

[niterydr]

Unless you have larger injectors you are DANGEROUSLY lean.

You shouldn't need colder plugs or a different gap on E-85 on stock turbo's, now you SHOULD have some sort of ignition timing control.

[Gravy]

I'll try and make a potentially long post short, but the car on gas with the 550cc injectors runs great, but on e-85 with adjusted fuel to try and figure out the best feel for this first tank on the way home. I put some in by accident a while back and just dumped more fuel in the system, running the SAFC at 0% accross the board from a normal -30%. Wideband will be going in before i run the car on e-85 on the streets, but put a little in just so i had enough to drive around in, but enough that it woulnd't make dropping the tank difficult.

It gave me problems the first time i put some in on accident, but didn't disable the car. On normal pump gas at 0% settings on the safc it runs fine, but i just get black soot and tons of water out of the exhaust. Just wondering if it was a plug problem, but it only acts up under 10% throttle and at or around 0psi only. WOT i show no knock and it pulls just fine.

[JET]

You might be rich, try leaning it out a bit.

[Gravy]

Tried that, tried going from -5% from stock(on regular gas, all the way to -30% from stock, and +30 from stock, all the same. Don't even have to leave first gear to see if the problem is fixed, so that was nice. Going to try putting the gap down on the plugs when i switch out the turbo's and replace them. Will probably be a bit fouled by now with all that toying i've done with it.