Thread: The defacto guide to tuning your car for e85.

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  1. #41 Re: The defacto guide to tuning your car for e85. 
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    To get DIC calculations precise, simply multiple the mulipler in TT by the same % you increased the injector to compensate for ethanol.
    12.8@110mph: stock cam/m90/full street-trim
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  2. #42 Re: The defacto guide to tuning your car for e85. 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by Larz01 View Post
    Run engine in open loop. Lean out cruise in your ol/ve/rpm table. Add 35-40% to the ifr table & retune maf table; reference 2005 crank fuel tables. Done this for several years, excellent results in -20°F temps. And if anyone says some of the OL tables aren't mapped correctly for certain years in dhp/hpt your right. But, this can be corrected.

    If you fill up on gas; just plug in your front oxygen sensor. Drive on like nothing happened.
    Yeah that will work too.
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  3. #43 Re: The defacto guide to tuning your car for e85. 
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    Thanks Frosty. Worked like a charm here.
    E85 L32 S1X Heads 105#Crow Springs LQ4 2k+NStarTB Deka 60# Gen1 SLP Headers Stock Plugs
    19 deg GFS and ZERO KR@14 PSI <10% LTFT
    GMPP Struts/Springs SLP Sway Bars Z06 Brakes
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  4. #44 Re: The defacto guide to tuning your car for e85. 
    Donating Users gtpsleeper's Avatar
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    Might try and switch to this concept from my current way. May make it easier if I ever want to take a road trip.

    Edit: Also, do you find this helps keep the trims more consistant? When the fuel changes around here mine go nuts and sometimes I cant ever get it dialed in again, especially at idle.
    Last edited by gtpsleeper; 02-20-2015 at 11:41 AM. Reason: Question
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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  5. #45 Re: The defacto guide to tuning your car for e85. 
    GXP Level Member darkhorizon's Avatar
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    There is nothing better about having "low trims" vs "big trims"... Its all the same output and there has never been a car that "ran better" because it was closer to 0 on the trims.
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  6. #46 Re: The defacto guide to tuning your car for e85. 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by darkhorizon View Post
    There is nothing better about having "low trims" vs "big trims"... Its all the same output and there has never been a car that "ran better" because it was closer to 0 on the trims.
    Unless the LTFT was outside of your PCM's compensation range. Like, More than or less than 16.4, Correct?
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  7. #47 Re: The defacto guide to tuning your car for e85. 
    I Write E85 Stickies Frosty's Avatar
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    If its not within 10% then something is off on the tune or wrong with the car.
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



    I love Decker<3
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  8. #48 Re: The defacto guide to tuning your car for e85. 
    Awesome Level Member chrsmi1's Avatar
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    Quick question if possible Frosty, I used your method of increasing the cylinder gain across all 6 cylinders by a percentage. I used 22.5% but that's not my question. My question is after doing this method, my STFT's stay pegged out around 25. Is this normal? Is this just me reading the computer adding the extra fuel i'm telling it to?
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  9. #49 Re: The defacto guide to tuning your car for e85. 
    I Write E85 Stickies Frosty's Avatar
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    Is it +25 or -25? Something isn't right there either way. What's your long term trims?
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



    I love Decker<3
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  10. #50 Re: The defacto guide to tuning your car for e85. 
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    Pegged out at 16.4 at idle but it moves around a bit. And actually goes to 0 at wot. Car runs about the same so far but I just made these adjustments about an hour ago so I'll see. I tuned it for my 42# injectors, then put my cylinder skew rate to 122.5.
    It's +25.
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  11. #51 Re: The defacto guide to tuning your car for e85. 
    I Write E85 Stickies Frosty's Avatar
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    Filled up with e85?
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



    I love Decker<3
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  12. #52 Re: The defacto guide to tuning your car for e85. 
    Awesome Level Member chrsmi1's Avatar
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    OH yeah. I've been running E85 for about a month by just using 42# injectors on a normal injector sized gas tune. It ran pretty damn good that way. Never LTFT's pegged to 16.4, never any crazy STFT numbers. I just got an AVT box and DHP last week so i figured i better tune it the right way. SO far it's not bad, but i know running this rich isn't good. I just did to WOT pulls till 70ish. Both my long term and short term trims went to 0 and stayed there for the whole pull. But as soon as i start normal driving again, its back to 25 stft and 16 ltft.

    Both those numbers move as i'm giving it more or less throttle, but under cruise conditions they seem to stay there. I guess i could have tuned my injectors wrong. I did 33/42. .7857. And multiplied everything in the ifr boxes by that.
    Then i bumped the skew rate up to 122.5 for all 6 cylinders.
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  13. #53 Re: The defacto guide to tuning your car for e85. 
    I Write E85 Stickies Frosty's Avatar
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    You should have multiplied your stock IFR table by 1.27
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



    I love Decker<3
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  14. #54 Re: The defacto guide to tuning your car for e85. 
    Awesome Level Member chrsmi1's Avatar
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    Thats with HP Tuners right? I thought with DHP you divide?
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  15. #55 Re: The defacto guide to tuning your car for e85. 
    Donating Users gtpsleeper's Avatar
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    trims pegged at 16.4 and 0 at WOT= vac leak probably
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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  16. #56 Re: The defacto guide to tuning your car for e85. 
    I Write E85 Stickies Frosty's Avatar
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    Gotta remember it takes a long time for wot trims to adjust. A better idea would be if its trimming at idle AND not trimming while cruising down the highway THEN you have a vac leak. I don't remember the whole divide vs multiply in dhp.
    "Lets just throw more boost at it and see what happens" -Frosty
    The Defacto Guide to tuning your car for E85. Read it and learn.



    I love Decker<3
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  17. #57 Re: The defacto guide to tuning your car for e85. 
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    Dhp you can just import the 42.5 ifr chart thats built into power tunner.
    2002 GTP..DD.. Topswapped Gen V L26, XP cam, Full Size IC, E85, 2.6 Pulley,SD Headers, K&N Intake, N*/Lq4,FP Rewire, TEP Trans, F body Fronts, GXP Rear Brakes, LE Spoiler, AGXs with vogtland springs, bonni gxp rims, Timboku Tuned
    1995 Cutlass Supreme Convertible...Soon to be L32Swapped.....2005 GXP Stock
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  18. #58 Re: The defacto guide to tuning your car for e85. 
    Awesome Level Member chrsmi1's Avatar
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    Quote Originally Posted by timboku View Post
    Dhp you can just import the 42.5 ifr chart thats built into power tunner.
    I tried this and i get an error #130, error generating import menu. So that's out. But i searched the forum and found a couple of threads about changing it manually and thats how i came up with my 33/42.5 calculation.
    I'm pretty sure it's not a vac leak since before E85 trims were always close to 0. After switching to bigger injectors on stockish tune they stayed between +10 and 0. Normally somewhere around 7, or while cruising up to 13, but never negative and almost never 16.4.
    I'm convinced the new trims are related to me messing something up while tuning the ifr and skew rate.
    Even more so because I reflashed my pcm back to the old tune after the crooked numbers a bit ago and it went back to how it was, with no crazy stft and not pegged around 16 ltft. Drove around for 30 mins, car was good, numbers looked normal.

    I don't want to thread jack your great guide Frosty so i'll stop posting my tuning fail questions here.
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  19. #59 Re: The defacto guide to tuning your car for e85. 
    Schooner Tuner ADrugDealer's Avatar
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    Sticky for useful info on E85, in hopes of reducing the amount of E85 question threads and how do I tune this threads.
    2008 G8 GT - IOM - LSA Blower, Intercooled, Ported Heads, Cam, Flex Fuel Conversion, Tuned - 550whp - 11.5 @ 124 -
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  20. #60 Re: The defacto guide to tuning your car for e85. 
    SE Level Member Casper00693's Avatar
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    As a tuner I love e85 in the 2 1/2yrs of on and off e85 tuning I want to say that this is the most effective tuning guide to run. E85 that I have used and found very useful... Special thanks to Frosty in this write up. It works!
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