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  1. #1
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    Oct 2020
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    Default Can someone help find the issue from datalog?

    Hello,

    I am working (slowly) with a mail order tuner. It is for a free re-tune, which is why it is slow going. I sent them the first datalog, and evidently it is way out from what they expected.

    They first thought it might of been a vacuum/ boost leak, so I bought a smoker and could not find anything.
    Then they were asking about the fuel system, which I described it back to them and waiting on a response back now.

    Vehicle info:
    2004 Sierra 1500 4x4
    wired up "stand alone"
    6.0l lq9
    4l80e trans
    2.9l Whipple supercharger
    ported heads
    1.875" headers
    3" dual exhaust
    90mm throttlebody with xlink adapter
    fuel system is 63lb/hr injectors @ 43.5psi- running a boost referenced fuel pressure regulator, set at 58 psi with the line disconnected.

    cam specs.

    Intake Duration at .050 Inch Lift:227
    Exhaust Duration at .050 Inch Lift:243
    Intake Valve Lift:0.614
    Exhaust Valve Lift:0.624
    Lobe Lift Intake:0.361
    Lobe Lift Exhaust:0.367
    Lobe Separation:114
    Intake Centerline:109

    So if anyone can look at this, and suggest any issues that could be causing me problems- it would be appreciated.

    thanks,
    Josh
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