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Thread: I think I'm getting crazy...

  1. #1
    Tuner in Training
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    I think I'm getting crazy...

    I'm messing with a stock motored turbo car at the moment. Its olsd, with the 2 bar upgrade. For the life of me, I can't get it to not idle at 11.2. I've done quite a few SD tunes....and never had this issue.

    The car idles in RPM cell...800 and MAP cell 35 on the VE table. I can make the number 15.....25...35...55...it idles at 11.2. I have verified this with another o2 sensor. My inj PW's are 1.9-2.0. Its like its getting its fuel elsewhere.


    Any ideas? It almost seems like a software problem.

  2. #2
    Tuner bigbrian442's Avatar
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    Quote Originally Posted by Scott125 View Post
    I'm messing with a stock motored turbo car at the moment. Its olsd, with the 2 bar upgrade. For the life of me, I can't get it to not idle at 11.2. I've done quite a few SD tunes....and never had this issue.

    The car idles in RPM cell...800 and MAP cell 35 on the VE table. I can make the number 15.....25...35...55...it idles at 11.2. I have verified this with another o2 sensor. My inj PW's are 1.9-2.0. Its like its getting its fuel elsewhere.


    Any ideas? It almost seems like a software problem.
    Leaking injector(s) or fuel pressure regulator?

  3. #3
    Tuner in Training
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    What size/brand injectors and what motor?
    9:1 347ci LS-West Coast Cylinder Heads-F.A.S.T.-Precision Engine & Turbo-Rossler-Yank-Trutrac-Hoosier


    Think with your dipstick, Jimmy!!!

  4. #4
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    I'll take a look at the FP reg and check injectors.

    It has 60#'s, stock 5.7

  5. #5
    Tuning Addict WS6FirebirdTA00's Avatar
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    Post the tune. My money is on you are hitting the min pulse limit.
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
    2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB

  6. #6
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    Quote Originally Posted by WS6FirebirdTA00 View Post
    Post the tune. My money is on you are hitting the min pulse limit.

    Even with the inj PW table stock it does this.

  7. #7
    Tuning Addict WS6FirebirdTA00's Avatar
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    If it is stock then that is your problem. Post the tune.
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
    2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB

  8. #8
    Senior Tuner
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    Quote Originally Posted by Scott125 View Post
    Even with the inj PW table stock it does this.

    First step in tuning any vehicle is to start with a correct IFR (Injector Flow Rate) table.

  9. #9
    Tuning Addict WS6FirebirdTA00's Avatar
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    Quote Originally Posted by Cantalope Kid View Post
    First step in tuning any vehicle is to start with a correct IFR (Injector Flow Rate) table, injector offset table, and pulse limit tables when you have other than stock injectors
    I fixed it for you
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
    2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB