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Thread: Looking for the flex fuel pin in a e40

  1. #1
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    Default Looking for the flex fuel pin in a e40

    I have a idea on making somewhat of a custom OS. I have a few E40 gto's and a tbss that I've tuned and all have spray on them. I see that in the E40 calibrations list under general spark flex fuel(ethanol) spark (b5114). Now if you put in say -5* in this table and could power the pin that detects ethanol it should pull that amount of timing from the total timing. Does anyone know if this would work?
    Last edited by 1meangto; August 1st, 2007 at 08:48 AM.
    cosmos purple 2004 gto
    408 E85 GT47-91 ,turbo 400,9" currie straight axle,28/10.5w mt et streets



    2005 yellowjacket gto
    417 rwhp and 397 torque
    582 rwhp and 676 torque (150 shot)

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    It will be a little more complex than that because it will alter the fueling too. Good idea though, might be pretty tough to get working.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
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  3. #3
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    Are the flex fuel fueling tables available in efilive? I looked for them but may have over looked them. If so couldn't you just 0 out the fuel table? or set it to 1.0? I have never sen a flex fuel tune so not sure what they look like. But anyways I would assume you could just put a smaller jet in the fuel sided to accommodate the richer condition. Every car I tune I tune for e85 anyways it would be nice to make the flex fuel program work if possible. The last car I tuned on e85 thats been dyno'd picked up 28 rwhp and 33rwtq which is a pretty good gain just to run cheaper fuel.
    cosmos purple 2004 gto
    408 E85 GT47-91 ,turbo 400,9" currie straight axle,28/10.5w mt et streets



    2005 yellowjacket gto
    417 rwhp and 397 torque
    582 rwhp and 676 torque (150 shot)

  4. #4
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    GMPX- do you have a pin layout for the e40? I really want to try this at least for the e85 tune I have in her car now. It would be great to switch back and forth.
    cosmos purple 2004 gto
    408 E85 GT47-91 ,turbo 400,9" currie straight axle,28/10.5w mt et streets



    2005 yellowjacket gto
    417 rwhp and 397 torque
    582 rwhp and 676 torque (150 shot)

  5. #5
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    Bumping this back up... any progress on this?

  6. #6
    Forum tyhee Site Admin GMPX's Avatar
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    Not even been looked at.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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  8. #8
    Lifetime Member swingtan's Avatar
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    Have you opened your E40 tune to see what's in there? I just looked at one with OS 12598977 and found the following.....

    {B3671} Stoichiometric AFR: has ethanol range from 0.0% to 100%

    {B5114} Flex Fuel (Ethanol) Spark: Spark table for Ethanol fuel.
    {B5115} Flex Fuel (Ethanol) Spark Mixture Spark Correction: AFR vs spark timing correction for ethanol.
    {B5145} Flex Fuel (Ethanol) Spark Multiplier:For blending between ULP and Ethanol fuel.

    So if you were to send the appropriate signal to the Ethanol sensor pin, you could force the ECM to use the Ethanol tables for NOS. If you did this right, you can use the E40 to control both spark and fuel when running the gas.

    FWIW, the Ethanol sensor signal is a square wave with the frequency indicating the ethanol percentage, it's not just "power on for ULP, power off for Ethanol". However, it's easy enough to make up a square wave generator to switch between the required frequencies. I'd use the NOS solenoid power to trigger the change.

    Finally, before you ask, no I don't have the pin outs for the E40.

    Simon.

  9. #9
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    I saw the same thing and mainly bought EFILive for the extra tables not available in my other software. I'm sponsoring a ZR1 currently that is on the heels for the record of being the fastest ZR1 on the planet and it will have a COS from EFILive powering it in two weeks.

    With that said I also do a lot of LS2 GTO's and some of those guys like to spray their cars as well and it'd be nice to have an option to do the same we are doing on the E38/67 ECM's.

  10. #10
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    I agree, but I highly doubt the E40 will be revisited except for a bug fix or error in a calibration. What really sucks is that it was only used for 2 years then GM moved on, I think you're going to have to keep doing the relay on the IAT sensor and use that to pull timing.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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