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Old 09-28-2014, 05:54 PM   #1
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E85

When do you guys think gas stations will start having E85 regularly? Here in San Antonio, Texas it only marks 2 gas stations with it. Not worth a 26 minute drive just for a custom E85 Tune :/....
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Old 09-28-2014, 06:34 PM   #2
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It is worth it.
There is only one in new braunfels.

If you are serious about racing it's worth it.

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Old 09-28-2014, 06:45 PM   #3
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whats the advantages of e85
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Old 09-28-2014, 06:48 PM   #4
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whats the advantages of e85
Long story short its the equivalent of around 105 octane.
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Old 09-29-2014, 09:54 AM   #5
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Also been curious about this. I'm aware it's equivalent to a higher octane, and some swear by it. Yet nobody seems to have any real evidence of the gains or any potential issues with it.

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Old 09-29-2014, 11:10 AM   #6
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Also been curious about this. I'm aware it's equivalent to a higher octane, and some swear by it. Yet nobody seems to have any real evidence of the gains or any potential issues with it.

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There is plenty of stuff just look. Everyone wants stuff handed to them now. Go search and you will see

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Old 09-29-2014, 11:23 AM   #7
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Also been curious about this. I'm aware it's equivalent to a higher octane, and some swear by it. Yet nobody seems to have any real evidence of the gains or any potential issues with it.

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There is plenty of evidence. Stock cars don't see that much gains but forced induction cars will see plenty of gains from just switching over.


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Old 09-29-2014, 11:31 AM   #8
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There is plenty of evidence. Stock cars don't see that much gains but forced induction cars will see plenty of gains from just switching over.


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Imagine E85 on the new Z06... or Hellcat, or the next FI Mustang.
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Old 09-29-2014, 11:40 AM   #9
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There is plenty of stuff just look. Everyone wants stuff handed to them now. Go search and you will see

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Been there done that, everything is about FI which is obvious. I'm talking about n/a applications.

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Old 09-29-2014, 11:48 AM   #10
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Been there done that, everything is about FI which is obvious. I'm talking about n/a applications.

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I gained 26 hp and 22 tq on motor alone

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Old 09-29-2014, 11:49 AM   #11
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I gained 26 hp and 22 tq on motor alone

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Over 93 or 87 pump gas?
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Old 09-29-2014, 11:50 AM   #12
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Over 93 or 87 pump gas?
93. I have never used 87

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Old 09-29-2014, 02:39 PM   #13
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I gained 26 hp and 22 tq on motor alone

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Not bad. What's the process if you don't have full e85 like say you have a 1/4 tank of e85 and need gas and only option is 93? Have to switch tunes or is it setup like a flex fuel vehicle?

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Old 09-29-2014, 03:00 PM   #14
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E85 flows about 30% more than gas so your fuel system has to be up to par. If you want to mix then you'll have to do some math. If you do have to change gas then run it down to as near empty as possible, fill up with the other gas and change your tune right there. Then drive for a bit and go fill up again to help dilute what was ever left in there.


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Old 09-29-2014, 03:18 PM   #15
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I can't find 93 in my area.

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Old 10-01-2014, 10:55 AM   #16
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In Houston e85 is everywhere, here in LA only seen one -_-

Very well worth the upgrade. Stock lines will be fine for a bolt on car, Upgrade to bigger injectors and fuel pump as it uses 30% more fuel at WOP.

E85 helps keep temps down in the cyl therefor making more power safer.


and its cheaper
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Old 10-01-2014, 11:09 AM   #17
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I haven't seen any E85 pumps near me in VA.
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Old 10-01-2014, 11:28 AM   #18
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Since when is a fuel pump upgrade needed of your n/a on e85? Thought just bigger injectors were needed?

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Old 10-01-2014, 11:47 AM   #19
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Since when is a fuel pump upgrade needed of your n/a on e85? Thought just bigger injectors were needed?

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All depends on your setup and what year the car is etc

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Old 10-01-2014, 11:48 AM   #20
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All depends on your setup and what year the car is etc

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Mines an 11 a6. Long tubes full off road exhaust boss intake jlt, tune, converter etc

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Old 10-01-2014, 01:02 PM   #21
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The octane level actually varies with location and at different times of the year. It depends on location, corn, and even the way it's calculated (part of the location thing). As far as being available, it depends where you live and who will use it, as well as availablity to be manufactured. We have E85 at several stations close by year round.

Basically, it burns cooler so timing can be advanced. This is good for high compression engines and engines with FI. The catch with that is the fuel can vary in octane level in different locations as well as certain times of the year. A flex fuel car may not give a poo, because it's tuned very safely. With someone who has a performace purpose for it may have some headaches with how they tune their car. Get some low octane and have detonation, then boom goes the engine. That being said, it can be done. I've read some fuel systems that aren't designed for e85 can have corrosion issues, so that's something to think about. I thought about it for a while, being as how I have plenty of E85 nearby, but decided against it becuase I just didn't want the headache of tuning it properly and testing the fuel.
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Old 10-01-2014, 01:06 PM   #22
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The octane level actually varies with location and at different times of the year. It depends on location, corn, and even the way it's calculated (part of the location thing). As far as being available, it depends where you live and who will use it, as well as availablity to be manufactured. We have E85 at several stations close by year round.

Basically, it burns cooler so timing can be advanced. This is good for high compression engines and engines with FI. The catch with that is the fuel can vary in octane level in different locations as well as certain times of the year. A flex fuel car may not give a poo, because it's tuned very safely. With someone who has a performace purpose for it may have some headaches with how they tune their car. Get some low octane and have detonation, then boom goes the engine. That being said, it can be done. I've read some fuel systems that aren't designed for e85 can have corrosion issues, so that's something to think about. I thought about it for a while, being as how I have plenty of E85 nearby, but decided against it becuase I just didn't want the headache of tuning it properly and testing the fuel.
Sounds like more of a pita then it's worth and I have e85 everywhere I look.

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Old 10-01-2014, 01:35 PM   #23
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what's the price difference averaged?
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Old 10-01-2014, 02:31 PM   #24
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E85 will cost more.
You'll run 30-40% more on average, so even though E85 is cheaper, if its not > 30-40% cheaper, you're not actually saving any more.

E85 will make power with zero changes to the tune (aside from obvious fueling adjustments), it will just be marginal. E85 basically flash cools the combustion chamber, creating a low pressure zone (because the air suddenly becomes more dense) and rushing more air into the cylinders.
The further effects are increased by being able to increase compression via cam and ignition timing. In my experience, Even though E85 can fluctuate throughout the year (we have a constant blend here in Houston since it doesn't freeze) E85 is still incredibly knock resistant. It is possible to run right past MBT on E85 and still not see a spit of knock, so unless your tune is run to the ragged edge, you will be fine.

Lastly, starting in 2010, all engines and fuel systems were required to be Ethanol compatible compatible. Dont quote me on that, but on my last platform, we did extensive testing on various fittings / bushings / hoses ... in the fuel system and saw very mild, if any degradation in the parts over long term periods. Literally the ONLY downsides to E85 are availability and mpg. Its damn near God's gift to the motoring community.
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Old 10-01-2014, 02:32 PM   #25
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Sounds like more of a pita then it's worth and I have e85 everywhere I look.

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I admit though, I really wanted to make it work for my setup. I don't have plans for FI in the future and doing cams is pretty far out. I was hoping that full exhaust, intake spacer (for midrange), E85 conversion, and a dyno tune could get me to 300HP to the wheels. I just don't know if the E85 mod would be worth it in my situation. It seems like most of who I see using it on their build is at the "fully modded" point and are trying to eek every little ounce of power they can out of their setup and this is just another method. Another is the meth injected setup. I don't know anything about those setups, but it is supposed to create cooler temps in the combustion that will allow them to advance timing a little more.
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Old 10-01-2014, 03:04 PM   #26
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I'm definitely going to be converting over to E85 when I go return style fuel system. Should help a lot with the boost.


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Old 10-01-2014, 03:11 PM   #27
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The best thing to do is use the same pump for every fill up, go to the same pump your tuned with.
The e85 I use is 85-90% on every test

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Old 10-01-2014, 07:44 PM   #28
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How much are you paying a gallon Rapinator? and how much is gas a gallon in your town
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Old 10-01-2014, 07:50 PM   #29
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How much are you paying a gallon Rapinator? and how much is gas a gallon in your town
Im paying $2.75 and I believe premium is $3.89

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Old 10-01-2014, 07:56 PM   #30
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I know you use it for racing but out of curiosity have you checked to see how many miles u get with the e85 vs the premium to a full tank?
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Old 10-01-2014, 08:07 PM   #31
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Around here it's like 30-50 cents cheaper. Better off running good ol 93 if it's uses that much more fuel.

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Old 10-01-2014, 08:27 PM   #32
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I get 8-9 in daily traffic.
And around 12 on highway

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Old 10-01-2014, 10:00 PM   #33
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F*ck that lol

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---------- Post added at 10:00 PM ---------- Previous post was at 09:59 PM ----------

Just checked when ran to the gas station. Unleaded is 3.39, e85 is 3.09.

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Old 10-01-2014, 10:03 PM   #34
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My car isn't a daily and I could care less about mpg. The most it moves is to and from the gym,
Other than that I drive my truck

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Old 10-02-2014, 10:31 AM   #35
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That's an extreme case though. I bet MPG loss is more like 3. I DD mine and I average about 18 per tank with mixed driving. I bet that would be around 15 on E85. Of course, if it has more gitty-up, that may end up being a little lower.


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