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Thread: lS3 crate engine - seems like low power at part throttle

  1. #1
    Potential Tuner
    Join Date
    May 2014
    Posts
    3

    LS3 crate engine - seems like low power at part throttle

    Background. LS3/6L80e combo into a Jeep JK. It's been running for 2 years flawlessly. Unfortunately I wasn't smart enough to do some data logging while it was running fine to compare.

    It just feels like the engine has low power between off-idle and 2,000 RPMs at part throttle. WOT operation seems to be unaffected.
    I opened up the scanner this morning and drove it locally to collect this data. Two things that I saw. First, the IAT can spike pretty good (although I'm in Phoenix and it was in the 90s this morning when I did the test. Second, I don't see any information on fuel injector pulse width.

    No MIL light, and no DTC codes are shown.

    Attached is the log file.

    Any thoughts, or what I should try next to narrow down the issue? Thanks in advance for any help.
    Attached Files Attached Files
    Last edited by tirespeed; 06-05-2017 at 09:21 AM. Reason: Added missing tune file

  2. #2
    You should post the tune.
    You need to post the tune so it can be compared to the log.

  3. #3
    Potential Tuner
    Join Date
    May 2014
    Posts
    3
    Thanks for that, I added the tune. Sorry about missing that step the first time.