[D CHOI]

I've been using 3 gallons of 100 octane with rest 91 on a full 13.7 gallon to achieve 93 octane.

I was wondering if I use E85 instead mixing x gallons to achieve 93 octane, would there be long term negative effects on stock parts? I know for 100 octane is decreases the spark plugs life sooner.

[Anthony1s]

Originally Posted by D CHOI

I've been using 3 gallons of 100 octane with rest 91 on a full 13.7 gallon to achieve 93 octane.

I was wondering if I use E85 instead mixing x gallons to achieve 93 octane, would there be long term negative effects on stock parts? I know for 100 octane is decreases the spark plugs life sooner.

Interesting question I've been thinking about all morning.

I don't think you'd be adding near enough ethanol for degradation to be a concern. What would the mix be, like 1 gallon e85 to a tank of 91?

I was thinking about having to re-tune for the higher ethanol content, but then realize it would only be a gallon or so you're adding, so you'd probably be fine. Though not sure how a tune would handle that (if you're tuned) if it'd need more injector or decrease power by not having enough fuel, or if it's not enough to matter.

Another part I've been thinking about... if you have access to e85, why not run the full e85 and the bm3 e30 tune? I'd save you the hassle of mixing. But you seemed to have answered that already, you're concerned with e85 deteriorating parts of your car.

[D CHOI]

Right it would just be 1 gallon but I dont know what overall octane that will average it to. as for the bm3 e30 tune I think u can only fill a certain amount. For a full E85 tune it would be additional cost from bm3.

But u are probably right about not enough ehtonal content to degrade stock parts.

[D CHOI]

Tried 1 gallon of E85 with the terrible vegas gas for full tank and car pulls

[Anthony1s]

Originally Posted by D CHOI

Tried 1 gallon of E85 with the terrible vegas gas for full tank and car pulls

What tune and mods?

[D CHOI]

Originally Posted by Anthony1s

What tune and mods?

bm3 stage 2

fabspeed 200 cell DP
vrsf intercooler + chargepipe
ngk colder plugs
fi catback exhaust