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Thread: 3800 turbo help lean

  1. #1
    Potential Tuner
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    Jul 2013
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    3800 turbo help lean

    i need help with my tune, its runs great but goes lean in upper rpms, recently swapped to 80lb injectors from 60s. motor is a stock long block with st5 cam, head studs, rwd with th350 and ptc converter. can someone look at my tune and help get it closer. thanks
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  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Are you losing fuel pressure?
    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
    Potential Tuner
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    dont think so but hard to watch and make a pass, a1000 pump with big aeromotive reg boost ref, set at 58psi

  4. #4
    Tuning Addict 5FDP's Avatar
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    Ok.

    So then adding fuel to the MAF curve still makes it go lean?

    I never ran E85 on my old Pontiac so seeing the whole 9.7 stoich and 8.5 commanded PE threw me for a loop. Too used to the V8 computers that use the gas scale for everything.
    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.

  5. #5
    Advanced Tuner ZeroBoostBuick's Avatar
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    Aug 2008
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    The MAF curve looks very close to stock ?