Running E85 - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 19 Old 02-11-2017, 01:33 PM Thread Starter
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Running E85

Thinking of running E85. Wondering if anyone out there with similar set up can give some insight. Never used E85 before and wonder all that needs to be done to run it. Been looking into it and want E85 octane level and cooling effects. I have changed my fuel system to a return style system with adjustable pressure regulator, My fuel lines are aluminum, I run two walbro 255lph pumps in a Fore fuel hat all filtered with one those Aeromotive fuel filters. I do realize Need to change tune. Fatten up fuel trim for the E85. Did search for other treads on this subject. Just not finding what I am looking for so starting this thread. Any help will be appreciated. Forgot have 42lbs. injectors.



My car:
O2 Mustang GT
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post #2 of 19 Old 02-11-2017, 02:23 PM
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Do not know how much power you are currently making, but if your fuel injectors are at more than 60% duty cycle on the current fuel, they will be marginal for E-85. I switched from C-16 to Pro E-85. With 225 lb/hr injectors @ 20 psi, the duty cycle on C-16 was 48-50% and on E-85 it is 78-80%. My target A/F went from 12.0:1 on C-16 to 7.4:1 on Pro E-85. I do not use pump E-85 as the mix can vary to much from tank to tank.


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Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
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post #3 of 19 Old 02-11-2017, 10:06 PM Thread Starter
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Yes have read this also that E85 and it not being stable out the pump. The only way I can get it is ordering drums so I am not worried about pump E85. Also read a little on E98. It stating it is more reliable and stable than E85. I just want to make sure I do it right! Don't want to waste the motor! Was thinking of removing all the gas from the system and putting in E98 and installing bigger injectors. Then watching my wide band and turning up my fuel pressure regulator to add more fuel til I got it to stoich at idle. Then carefully test. Watching the a/f ratio to make sure it goes rich giving it power.
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post #4 of 19 Old 02-11-2017, 10:08 PM Thread Starter
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Dam Saleen your #### runs good! 8.6! Nice!
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post #5 of 19 Old 02-12-2017, 12:45 AM Thread Starter
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LOL! Take it most on here don't even know what E85 or E98 is. One out of all of you. lol. Oh well. Will still have to look into it more.
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post #6 of 19 Old 02-12-2017, 12:46 AM
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Rule of thumb is 30% more fuel. I've been running it in my lightning for several years.
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post #7 of 19 Old 02-12-2017, 12:54 AM
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You could buy a barrel of E98 and blend it with 91 or 93 to make E85. I've considered this for my fox.

Unfortunately here in AZ, we used to have pump E85, now its ethanol blended gasoline, or E54 as its being called.

I think the 42's may not be enough....

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post #8 of 19 Old 02-12-2017, 01:05 AM Thread Starter
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I'm in Nevada. Real Nevada not that southern part. There is one place which is quite a distance to go to get pump E85. So I will have to get a drum. Thinking if I get E98 will tune it to E98. Don't feel like messing around mixing and testing it to make sure I get the mix right. So none of you that have been running it a while have any problems with it?
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post #9 of 19 Old 02-12-2017, 05:57 AM
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What is that you specifically want to know? With E85 you can lean the tune more (0.85 lambda) because of its cooling effect, and you can also run more timing than with 93octane fuel. I do not know how much boost you are running but your injectors are small to convert to E85, we run 80lbs and twin 450 pumps on a wannabe race car. Fuel requirement is roughly 20-30% more on E85 than regular pump fuel so plan ahead. There is also e85 content sensors that let you know how much Ethanol is in the fuel (around here E85 is about 70% ethanol= E70)...
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post #10 of 19 Old 02-12-2017, 08:45 PM
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My brother's having a tough time getting it figured out. 63 Fairlane 552" BBF street car. E85, runs fine in low gear, soon after shifting into 2nd it falls on it's face.

I'm pretty sure I could figure it out but it's not mine, and he needs to learn the same way I did. The hard way.


'92GT, 427" and '93 "LXVO" coupe
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post #11 of 19 Old 02-12-2017, 09:29 PM Thread Starter
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Ok thanks people. Have a fairly good idea up what I'm getting into and what I need to do. Going to get bigger pump and injectors roughly 50% larger. Drain the fuel put the E98 in and use the programmer to fatten up the fuel trim. Oh pushing 20 psi right now. Todd think carbureted is a whole different animal. Have read that you need to change more hardware to run it. Carb. parts etc. for pre 88 vehicles.


For right now though I'm installing a two step and a line lock. Fuel conversion will be next mod.
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post #12 of 19 Old 02-13-2017, 09:42 AM
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Ok thanks people. Have a fairly good idea up what I'm getting into and what I need to do. Going to get bigger pump and injectors roughly 50% larger. Drain the fuel put the E98 in and use the programmer to fatten up the fuel trim. Oh pushing 20 psi right now. Todd think carbureted is a whole different animal. Have read that you need to change more hardware to run it. Carb. parts etc. for pre 88 vehicles.


For right now though I'm installing a two step and a line lock. Fuel conversion will be next mod.
Proper way is to retune it. Most strategies have a fuel selection switch or a stoich number that allows easy conversion to e85 or 98. Going through the handheld isn't a smart way to do it. Sounds like you have a lot invested in your car, seems like a good idea to drop some coin on a proper tune for it.
I run E85 on pretty much all my vehicles and i tune as well. Jmho.

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Last edited by Mustangmichael; 02-13-2017 at 09:46 AM.
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post #13 of 19 Old 02-13-2017, 10:08 AM
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I switched from 93 to e85 on my turbo mustang and run it on another car with a roots blower setup as well. I just get pump e85 from the Valero station down the road and it has been fine. blends don't change here in texas I don't think so it has been consistent. Seems like you have enough pump and fuel lines but I'd go with 60lb injectors or 80's if you can get a good deal. I run eight 80's on my turbo car and 4 160's on my blower car. Maybe a bit more than I need for a stock block but they work fine and idle well. I just kept using the Gas scale since I'm familiar with it and the new stoich programmed into my ECU so I still look at 11.5 WOT, 14.7-15 cruise, 13.5 idle (batch fire likes it a tad richer at idle).

Loving the fuel so far. Everything stays clean and cool.
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post #14 of 19 Old 03-16-2017, 06:54 PM
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I switched from 93 to e85 on my turbo mustang and run it on another car with a roots blower setup as well. I just get pump e85 from the Valero station down the road and it has been fine. blends don't change here in texas I don't think so it has been consistent. Seems like you have enough pump and fuel lines but I'd go with 60lb injectors or 80's if you can get a good deal. I run eight 80's on my turbo car and 4 160's on my blower car. Maybe a bit more than I need for a stock block but they work fine and idle well. I just kept using the Gas scale since I'm familiar with it and the new stoich programmed into my ECU so I still look at 11.5 WOT, 14.7-15 cruise, 13.5 idle (batch fire likes it a tad richer at idle).

Loving the fuel so far. Everything stays clean and cool.
Yeah, the stuff just can't be beat. I stick with the gas scale as well, I stick with what I know.
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post #15 of 19 Old 03-25-2017, 09:40 PM
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Messed with it some more on my brother's car. Race car only now.

For a street car, yeah it works really well. Race car only that rules will allow anything but nitro, there are better options, IMO.

'92GT, 427" and '93 "LXVO" coupe
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post #16 of 19 Old 04-24-2017, 12:27 PM
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If it were carbed, I'd say call Mark Sullen and be done. It has been tested that a reading of e87 often makes the most power. Getting into the e98 range makes it much harder to lite off, and is not needed unless you have extreme compression,boost, etc. There are many cars in the 13+ compression area that are fine with e85. If you get into mixing your own that can be a real pain in the a$$. To get the most out of it, get a tune done by a tuner that has experience with E85 and can provide references. E85 is a different animal and can not be treated like gas, race gas, or methanol.

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post #17 of 19 Old 04-24-2017, 05:19 PM
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Just my 2c. One of my dailys is a turbo audi i want to change over to e85. Anyways, do a search(google) on a way to test the pump e85. I think there's a tester you can use. Also, if you call around or talk to someone at a local shop that builds motors they will tend to keep track of what pumps around town are the most consistent and or have the highest octane.

just a side note, i put a gallon or 2 in my tank on any car i have before it has to be checked for emissions here in Colo. works like a charm...

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post #18 of 19 Old 11-05-2017, 08:52 AM
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I am making mid/low 600s @ wheel and switched to pump e85 a few years ago. I had a A1000 and -8 line to the rails with 120lb injectors. Aftrr the switch I was loosing fuel pressure under boost.

After talking to Aeromotive, my pump was borderline. I had to move up to an Eliminator pump, -10 to the rails....basically upsized all my lines.

It took more fuel than i expected. My 120lb injector duty cycle went from around 40% to about 85% with E85. I only run pump E85 from Krogers or Murphy's and i test each tank.....seen as high as 90% and as low as 80....mostly dead on at 85%. I love the results.

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post #19 of 19 Old 11-06-2017, 07:38 AM
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You may not need E85. If your going to mix it yourself give her what she wants. E85 has about 103 octane and 22 percent oxygen inn true form. Go to youtube to the tuning school and watch the videos of gas vs e85 and so on . There are about 6 vids. In one of the vids they show a corvette making about 600hp on e65 I believe. The raise and lower the percentages and the hp falls off. The car makes around 8# of boost. I run pump gas and meth, no water. I shoot for 10.6 with this combo and 11.2 with water meth 50/50. I gained about 2.5 tenths.
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