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Thread: 2003 Tahoe 5.3 SD Tune with 70mm turbo at 7psi

  1. #1
    Tuner in Training
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    2003 Tahoe 5.3 SD Tune with 70mm turbo at 7psi

    I'm hoping someone can give me some advice on continuing with this tune. We have a relatively stock 5.3 with a 70mm turbo limited to 7psi of boost. I spent a lot of time reading through previous posts and how to's in order to get started and to get where I am. As of now, it is running a 2Bar SD tune in open loop. As of last night, the first pull seemed to go quite well with no knock but by the last log, it started to develop some KR. Any advice would be greatly appreciated. (Sorry, if I'm doing something completely wrong let me know. I'm learning as fast as I can being my first attempt at this.) Thanks in advance!!


    TahoeBoost.cfg
    2003 CHEVY TAHOE 2BAR SD.hpt
    Final 2.hpl
    Final adjustment.hpl

  2. #2
    Tuning Addict 5FDP's Avatar
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    I do think nearly 13 AFR commanded is pretty lean.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    And this may be another issue. I have both the pe and be tables set but the commanded never shows what it should calculate out to.

  4. #4
    Tuner in Training
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    Actual afr is a lot better than what it's showing in the logger for commanded.

  5. #5
    Tuner in Training
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    Anyone have any ideas? I'm sure I'm just missing something simple.

  6. #6
    Senior Tuner Mep_q8's Avatar
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    Your running too lean. Try this tune. If you need more help PM me.
    Attached Files Attached Files

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
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  7. #7
    Tuner in Training
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    Here is another log after using the new map. Thanks.

    S3664.hpl
    2003 CHEVY TAHOE 2BAR-SD-NEW-FUEL.hpt
    TahoeTurbo.cfg