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Old 05-24-2014, 09:56 PM   #1
SueBaroo
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Default E85 test. 70% 87oct / 30% E85

So I've been reading a lot about mixing E85 here. I've done the calculations on one of the E85 mixing calculators, and basically it's 30% E85 and 70% 87oct to get 91oct.

I filled up 4 gal of E85 and 12.something of 87.

I will be trying this out on my wag.

Mods:
AEM SR Intake
Stock TMIC
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COBB AP Stage 1

I will be updating this thread along the way.

The station with E85 in Ontario, CA is off Vineyard and Holt if anyone is interested. It was about $3.86 or so...can't remember.
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Old 05-25-2014, 01:01 AM   #2
thisisthenewsic
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not sure what your trying to do here?

your trying to make 91 by running part e85 and part 87?
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Old 05-25-2014, 07:30 AM   #3
st205wrx
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Likewise ^ can you be more specific with what you are going to test?
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Old 05-25-2014, 08:13 AM   #4
JMK508
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If you want 91......just buy it at the pump
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Old 05-25-2014, 10:10 AM   #5
SueBaroo
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Yes blending to get 91. My work pays for 87 but not 91.
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Old 05-25-2014, 10:11 AM   #6
SueBaroo
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Also just testing e85 in general
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Old 05-25-2014, 02:48 PM   #7
Jubathoph
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You might get 91 blended octane rating, but your Air Fuel ratios will be way off. Your car will run very lean unless you get it tuned properly.
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Old 05-25-2014, 03:45 PM   #8
bjohnson_55
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Ethanol doesn't have octane. It's completely theoretical.
As already stated, 30% ethanol is just going to make it run lean. I think it's obvious that it wouldn't be close to as safe as straight 91.
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Old 05-25-2014, 03:50 PM   #9
VladiWrX
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Mixing and blending without a flex fuel sensor or any way to adjust?
Oh boy, start saving for a new engine
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Old 05-25-2014, 04:43 PM   #10
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Quote:
Originally Posted by VladiWrX View Post
Mixing and blending without a flex fuel sensor or any way to adjust?
Oh boy, start saving for a new engine
If its running a typical rich tune it's probably OKAY. Wouldn't do it without checking though, that's a terrible idea.

Last edited by ProfessWRX; 05-25-2014 at 05:00 PM.
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Old 05-25-2014, 06:32 PM   #11
SueBaroo
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Running stage 2 HWG setting on AP. No CEL after 100 miles. Will start logging it and checking for knock & lean/rich state.

Gave it about 20 miles before boosting.
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Old 05-25-2014, 06:36 PM   #12
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Quote:
Originally Posted by SueBaroo View Post
Running stage 2 HWG setting on AP. No CEL after 100 miles.
Gave it about 20 miles before boosting.
Doesn't mean all is well.
Quote:
Originally Posted by SueBaroo View Post
Will start logging it and checking for knock & lean/rich state.
Smart move.
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Old 05-25-2014, 07:45 PM   #13
Dcasta9
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Quote:
Originally Posted by bjohnson_55 View Post
Ethanol doesn't have octane. It's completely theoretical.
As already stated, 30% ethanol is just going to make it run lean. I think it's obvious that it wouldn't be close to as safe as straight 91.
Where did you hear this? Ethanol's octane rating's is much higher than gasoline's, and is a fact, not theoretical.
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Old 05-25-2014, 08:50 PM   #14
acheung
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Omg... Why would you even do this?
Your calculations are also assuming that your e85 blend is actually 85% ethanol which is rarely the case. Most stations run anywhere between 75% to 85% with their e85.
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Old 05-25-2014, 09:36 PM   #15
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I hope you have a wideband for this test. Also what are your ST and LT fuel trims. I didn't do calculations, but lets say you end up with 30-40% ethanol, then your fuel trims aren't going to be able to make up for that amount of ethanol. So you could end up running lean everywhere, not just WOT.

Also no codes doesn't mean anything as they could have already been disabled.

IMHO this sounds like dumb idea and the cost effectiveness of it wouldn't pay for that blown motor. Now if you could duplicate every tank of gas and actually tune car for it, that may be different story. But if you are just throwing X and Y into tank and not comping the tune for it, I think you will end up with very disappointing experiment that may cost you way more than you will save.
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Old 05-26-2014, 02:57 PM   #16
todontblink
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If you are set on this bad idea for some reason you might want to look into ECUtek's flex fuel set up. As others have said it will be impossible for you to know if you are mixing e85 or e70 and getting the exact amount in the tank every fill up would be impossible.
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Old 05-26-2014, 03:03 PM   #17
ProfessWRX
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Quote:
Originally Posted by todontblink View Post
If you are set on this bad idea for some reason you might want to look into ECUtek's flex fuel set up. As others have said it will be impossible for you to know if you are mixing e85 or e70 and getting the exact amount in the tank every fill up would be impossible.
Merpmod will soon have it too.
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Old 05-26-2014, 03:44 PM   #18
Paul
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^is that the flex fuel patch thats being worked on using OS?

Quote:
Originally Posted by SueBaroo View Post
Running stage 2 HWG setting on AP. No CEL after 100 miles. Will start logging it and checking for knock & lean/rich state.

Gave it about 20 miles before boosting.
This makes me believe you'll be needing a new motor soon. I wouldn't boost at ALL until I logged fuel trims and knock, plus a wideband would be required.

Last edited by Paul; 05-26-2014 at 03:50 PM.
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Old 05-26-2014, 08:36 PM   #19
todontblink
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Quote:
Originally Posted by Paul View Post
^is that the flex fuel patch thats being worked on using OS? This makes me believe you'll be needing a new motor soon. I wouldn't boost at ALL until I logged fuel trims and knock, plus a wideband would be required.
http://store.vtune.us/products/flex-...or-the-wrx-sti
This is what I have seen people doing lately, seems a little more worry free. I just have several maps for differing ethanol blends and a 93 oct map. I just use my AP to switch as needed.
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