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Old 09-06-2012, 06:26 PM   #1
sc00ter
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Default Adding 1-2 gallons of e85 when filling up on 91oct tune. Downsides?

I apologize if this is in the wrong section. I was planning on putting it in the engine management/tuning section but it didn't really fit there.

......

I am dyno tuned for 19psi on 91 octane, which is the highest octane rating I have readily available near me (aside from e85).

I have been juggling around the idea of occasionally throwing in 1-2 gallons of e85 when filling up with 91 for a little extra punch. I am planning on doing this when going on mountain cruises once every month or two. However, I'm curious as to what the downsides would be. I know in the long run e85 causes corrosion but would this cause issues with my drive ability since I'm not tuned for it?

I've sent an email to my tuner regarding this but haven't heard back in a few days so I figured I'd ask here as well since the cruise I'm planning on doing this for is in 2 days.

Thanks for any feedback.
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Old 09-06-2012, 07:34 PM   #2
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This will do bad things. It will not be a performance gain due to the fact you are tuned for 91. Also considering E85 uses on average 30% more fuel to run it would lean out your AFR if I'm not mistaken. In short, don't do it unless you want a reason to build a new block.
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Old 09-06-2012, 07:38 PM   #3
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You'd be MUCH better off (safer) to find a station that has race gas then doing E85.
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Old 09-06-2012, 08:11 PM   #4
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Regardless of what he does he isn't tuned for it. You will see very MINIMAL gains if any.
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Old 09-07-2012, 12:14 AM   #5
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You'll run lean basically. That's all, no benefits.
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Old 09-07-2012, 12:41 AM   #6
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Just go get tuned for E85 and be done lol!
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Old 09-07-2012, 12:56 AM   #7
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Quote:
Originally Posted by 07wrx84 View Post
Just go get tuned for E85 and be done lol!
^ This! You might not even want to go back to gas once your on E85! I wish there were more stations around though seriously.
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Old 09-07-2012, 01:34 AM   #8
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E-85 has less energy than normal fuel, which is why on an E-85 tune you have to run huge injectors and tons of fuel, but it does have an extremely high resistance to detonation/knock so you can run more boost, more timing as long as you dump in enough fuel. Running E-85 with normal fuel would actually be a downgrade, yes your "octane" would go up, but you are getting less energy out of the mix. It would be more ideal to run a water/meth kit, that way you are adding more chemicals in addition to your normal fuel. But in short, don't add E-85 to your fuel

Thanks,
Rick
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Old 09-07-2012, 01:51 AM   #9
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Quote:
Originally Posted by Strider327

^ This! You might not even want to go back to gas once your on E85! I wish there were more stations around though seriously.
I'll never go back to pump unless I have to!
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Old 09-07-2012, 12:44 PM   #10
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The more E85, the less energy per c.c. - you are dangerously lean right now, and you got away with it.

Don't push your luck further.....
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Old 09-07-2012, 01:16 PM   #11
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The fuel we get here in the south is already "10 % max ethanol"....or thats what all the pumps are marked with anyways. If thats right then that would mean 1 whole gallon of ethanol per 10 gallons purchased ? Thats seems like alot but must be safe to some sort of a degree or it would screw up whatever you put it in...right? Hell i dont know, i wouldnt add 2 or 3 gallons per fill up tho thats for sure. Like they all said above, its take so damn much of it in comp to gasoline. It would be ridiculous to use 100% eth unless you got access to a sheetload of it. I couldnt tell you where to get some around here, never seem a station that offered it.
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Old 09-07-2012, 03:43 PM   #12
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Thanks for all the feedback guys. I'm definitely going to avoid it. My tuner responded back saying essentially the same thing you guys did. Not at all worth the risks.

Quote:
Originally Posted by 07wrx84 View Post
Just go get tuned for E85 and be done lol!
I considered this when getting tuned after the turbo upgrade but the general consensus was that e85 isn't that readily available around me and it doesn't run well in the winter here where it can get to 20 degrees or lower consistently.

Quote:
Originally Posted by StealthTL View Post
The more E85, the less energy per c.c. - you are dangerously lean right now, and you got away with it.

Don't push your luck further.....
What are you talking about? I haven't done it yet.


Anyway, thanks for the replies everyone.
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Old 09-07-2012, 05:59 PM   #13
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my buddy though it was a good idea to try some e85 in his yamaha yz 426 dirt bike. it didnt go well. it wouldnt run and he had to drain out the tank and lines. if it were available more i maybe would run it in my car. there is only one station that sells it in the whole county.
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Old 09-07-2012, 10:33 PM   #14
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Quote:
Originally Posted by 424wrx
my buddy though it was a good idea to try some e85 in his yamaha yz 426 dirt bike. it didnt go well. it wouldnt run and he had to drain out the tank and lines. if it were available more i maybe would run it in my car. there is only one station that sells it in the whole county.
Lol duh!
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Old 09-08-2012, 12:19 AM   #15
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What are you talking about? I haven't done it yet.


My bad, mis-read the original, thought you were doing it regular.
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Old 09-08-2012, 02:34 AM   #16
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Read the E85 FAQ here: http://forums.nasioc.com/forums/showthread.php?t=803341

The guy who wrote that ran E85 blend on the stock ECU for years before converting to E85 and re-tuning. There is significant benefit to be had from mixing E85 on a stock ROM due to leaning out the stock richness in the open loop fuel map.

If you're tuned for 91, however, it's obviously not a good idea, as that has already tuned out the stock richness. It depends how they did the tuning how bad it would be. If they moved the ariflow ranges of the trims so OL fuel map isn't affected by the trims it would be worse than if they left the trim ranges alone.
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