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Thread: adding fuel pressure and WB02 into ecu.

  1. #1
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    Default adding fuel pressure and WB02 into ecu.

    Hi all,

    I'm looking to add fuel pressure and WBO2 into my ecu so that I can easily log with efilive. Later I plan to monitor both with an OBD2 style gauge that polls off the data lines, which is why I'd rather not run either signal analog into the V2.

    I have found the tutorial for adding fuel pressure to the ecu using the egr circuit. If this is done, can I add WB02 in through the a/c pressure circuit? Looking at the LC2 from innovate so I can program it to be linear 0-5v no problem.


    Do you guys think this would work?

  2. #2
    Lifetime Member picnic_george's Avatar
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    As long as your pcm has both you can use both.

  3. #3
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    Currently I am OS12593359. My end goal is COS5 based on OS12212156.

    Engine is a 99' vette LS1 in a street rod project, all emissions are removed. I don't think it had EGR stock- but could I enable it so that it reports?

    I imagine all ECUs have a/c inputs?

  4. #4
    Joe (Moderator) joecar's Avatar
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    If you need a third input:

    if PCM is not using EOP (engine oil pressure) input, you may be able to use that (must enable it in table G1207).

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    can I tie any needed 5v references and grounds to the EGR ones?

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    questions- got everything wired( I think). The autometer fuel pressure sensor in the EGR ports and LC2 WB02 in the a/c.

    I made the following calc_pid file. Can someone give it a once over?

    I think my WB02 forumla is "({GM.ACP}*2.608)+7.35" because the LC2 is setup to be 0V=7.35AFR and 5V=22.39AFR.

    Not sure what PRN is??? I just indexed it 1 to not interfere with the fuel pressure sensor.

    Anyways, my calc_pid file should be attached.

    Thanks!
    calc_pids.txt

  7. #7
    Joe (Moderator) joecar's Avatar
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    I think my WB02 forumla is "({GM.ACP}*2.608)+7.35" because the LC2 is setup to be 0V=7.35AFR and 5V=22.39AFR.
    For 0V=7.35AFR and 5V=22.39AFR, the equation would be V*3+7.35...

  8. #8
    Joe (Moderator) joecar's Avatar
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    I fixed your calc_pids.txt file, see attached...
    Attached Files Attached Files

  9. #9
    Joe (Moderator) joecar's Avatar
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    You would use the pids CALC.FP.psi or CALC.FP.kPa, and CALC.WBO2.AFR and CALC.WBO2.LAM (use lambda for tuning).

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    Thanks sir. Long day yesterday- I even laid everything out in excel to make sure the slop of my line was correct. Apparently I still failed lol.

    Is there a document that lays out the formatting of these text files? I see you combined the fuel pressure and WBO2...

    I would like to make another calculated PID- for boost pressure. Is it possible to to take baro pressure and subtract it out of MAP real time? Or do you assume baro to be constant? Not looking to tune with this variable- just a quick reference while driving and reading logs.

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