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Thread: help tuning turbo 5.3 sierra e38

  1. #1
    Tuner in Training
    Join Date
    Nov 2020
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    help tuning turbo 5.3 sierra e38

    turbo 2012 sierra 5.3 226/234 .525 .525 has a vs 78/75 80lb deka injectors idle afr is 12.6 as soon as i start drive it goes to8-9 same thing at wot heres a log and tune file12 5.3 80lb deka inj.hpl12 5.3 turbo 80lb street.hpt

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    Is the injector data correct?

    Something maybe seems off, the flow rate looks like something bigger than 80lb/hr injectors.

    I don't see any wideband data in the logs either.

    I see other weird things with the idle and base running airflow stuff that isn't right. Desoot mode should be disabled too.

    Put it in speed density and tune the VE with the wideband, then tune the MAF with the wideband.
    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.