E85 More Horsepower? etc.

[AFSP1211]

Almost pointless without an e85 specific tune. Higher knock rating equals more timing equals more hp, so e85 by its self does not increase hp. However, in certain applications it allows more hp to be gained.

[PurpleMinivan]

Well felllas i was just curious about this stuff and if anyone has tried it. I had seen a guy on PT that ran e85 in his truck and it was a second faster than the other full bolt on 6.2s if I am not mistaken. I have a few questions.

1. How much HP would e85 give on a 6.2 and are there any other advantages? 1600-1800hp how much would you like to make?
2. I know did decreases mileage. How much really? I wanna say it is 50 cents cheaper than reg gas here but i dont care. i would just run it when i felt like going fast
3. Will it adjust with a Nelson Tune like it does from 87-93? or do i need to buy hp tuners?You would need 2 tunes so either a spare pcm with an e85 tune or hptuners and "write entire" when downloading tunes for the fuel you're using at the time
4. is e85 safe for nitrous, turbos, or superchargers?<-- This is the only time I would use it... Just not needed for N/A, see below

i dont wanna come off as an idiot. i just have not read much about this as i dont see that many people use it.

Thanks fellas!

Don't read into this too negative but dropping a second in the quarter mile isn't going to happen by just adding 10* of timing on a bolt on truck. Not all the truth is being told...

I guess I'm confused on E85. I thought it was 85 octane and that is why it takes more to get a good burn. If it was 110 octane wouldn't it burn better? My truck is SD tuned and runs like crap on e85. Which would make sense if it takes more fuel and your mpg go down. I obviously know nothing about this so someone school us.

e85 is comparable to 114-115 octane because of it's make up and how it burns and how much is used. Octane has nothing to do with why certain fuels need more or less fuel... it's the stoich of the fuel among other things like if it's oxygenated and so on. regular gas has a stoich of say 14.7... what you get at the pump now-a-days has ethanol in it, up to 10%... The new stoich of pump gas is around 14.2 depending on the seasonal blend you get. C16 has a stoich of around 15.0, depending on the brand. E85 has a stoich of 9.8 ish... To simplify, the lower the stoich the more fuel/volume you need. Say your setup is happy with 12.5 AFR WOT,verified by checking the plugs on "the new" pump gas (stoich of 14.2)... If you change to e85 (stoich of 9.8) you might be looking for 7.8-8.0 AFR WOT on the same setup, again verified by reading the plugs. Every setup is different, so don't take the numbers I threw out as fact...

[pl4yboy]

The truck is a CCSB 2wd with 3.73s and bolt ons from what I've seen. The truck lives on e85... he never fills it with gas. IDK what else he's doing to get that 12.7, but I've yet to see anything come that close to him.

[DBRODS]

I love E85 especially when I pull up to the pump and its $2.62 a gallon...

[pl4yboy]

I love E85 especially when I pull up to the pump and its $2.62 a gallon...

Yeah, but then you have to pull up to it again 100 miles down the road.

[DBRODS]

Yeah, but then you have to pull up to it again 100 miles down the road.

usually around 150miles. Before I switched I was getting 12-13mpg on 93 and couldn't run much timing due to higher compression. Mpg has only dropped a little, I average about 10-11 now on fill ups with E85, so no big deal. The price per mile with 93/E85 isn't much difference and actually the E85 is a little cheaper to use. So its a win/win for me. Plus I keep drums of it at the shop so its always available..

[NoTaTurBo]

Don't read into this too negative but dropping a second in the quarter mile isn't going to happen by just adding 10* of timing on a bolt on truck. Not all the truth is being told...



e85 is comparable to 114-115 octane because of it's make up and how it burns and how much is used. Octane has nothing to do with why certain fuels need more or less fuel... it's the stoich of the fuel among other things like if it's oxygenated and so on. regular gas has a stoich of say 14.7... what you get at the pump now-a-days has ethanol in it, up to 10%... The new stoich of pump gas is around 14.2 depending on the seasonal blend you get. C16 has a stoich of around 15.0, depending on the brand. E85 has a stoich of 9.8 ish... To simplify, the lower the stoich the more fuel/volume you need. Say your setup is happy with 12.5 AFR WOT,verified by checking the plugs on "the new" pump gas (stoich of 14.2)... If you change to e85 (stoich of 9.8) you might be looking for 7.8-8.0 AFR WOT on the same setup, again verified by reading the plugs. Every setup is different, so don't take the numbers I threw out as fact...

thank you sir!

[NoTaTurBo]

e85 burns cleaner right? therefore better for your motor right?

[NoTaTurBo]

Yeah, but then you have to pull up to it again 100 miles down the road.

u should run an e85 tune at SAR and see what your beast runs.

[Frenchy]

It does burn a LOT cleaner. You also get a much cooler Air/fuel charge into the cylinder. (Just another point I didn't see mentioned)