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Thread: E38 6.0 Streetrod/Stanalone Swap - Very little ignition TIming

  1. #1
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    Default E38 6.0 Streetrod/Stanalone Swap - Very little ignition TIming

    Hoping someone can help me out-

    I've installed a 2008 6.0 and transmission into a street rod. I have a timing problem. The engine runs proper timing at idle and part throttle cruise, but as you tip into the throttle the timing decreases significantly all the way down to the 0-5 degree range. I have shut off all of the normal things you would in a street rod type application. I am using the T42 TCM. I am using a E38 ECM with a 2007 4.8 liter calibration to get around the cylinder de-activation system.

    There are no codes in the ECM or TCM, but I'm thinking there is something that it doesn't like.

    Any help or educated thoughts would be appreciated!

    Jim

  2. #2
    Lifetime Member ChipsByAl's Avatar
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    A log and a tune file will help out.
    Al
    "Trash that carb and get Injected!"

  3. #3
    Lifetime Member ChipsByAl's Avatar
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    sorry duplicate
    "Trash that carb and get Injected!"

  4. #4
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    Is "tip in" torque mgt active?

  5. #5
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    OK, we definitely need a tune if you're trying to use a different OS with a different size engine. Did you set the cylinder volume correctly?

    Are you running a MAF?

    What do you mean "get around the cylinder deactivation", just using a tune without it doesnt turn it off...you should really disable everything from the original tune (or a tune for your engine from a different platform).
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  6. #6
    Lifetime Member swingtan's Avatar
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    There are a number of things that may be causing this.

    • Torque Reduction from the TCM.
    • Torque Reduction in the ECM.
    • If the original tune file was for a manual, you may be triggering CFCO timing.
    • Any of the many spark correction maps for ECT, IAT, ETC.


    As Erik says, post a log and the tune.

    Simon.

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