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(Logs) Please help, bog after shift

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  • (Logs) Please help, bog after shift

    2008 335i 6MT, Hybrids, fbo, JB4, BEF.

    Car recently started bogging bad after shifting. Like the motor is completely dead for a few seconds, but then recovers like nothing is wrong. Not specific to any gear.
    Seems to happen less if I absolutely baby it.

    No codes.. Of course..

    Also, on cold startup, the rpms quickly fluctuate by a few hundred until the car would idle down normally. After that, rpms still fluctuate, but slowly and only by 50 or 100 rpm.

    These logs are from some random semi aggressive driving driving, just trying to capture the problem happening. Any help is much appreciated. Thanks
    Attached Files
    Last edited by shoepac11; 05-17-2023, 08:19 AM.
    2008 e90 6mt
    FBO/BMS meth
    19t turbos
    2" inlets
    G5 iso
    back end flash
    fuel-it stg 2

  • #2
    You'll need to do a proper WOT log and don't short shift. If it's doing it on it's own, then it may be an issue with the trans.

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    Video of our Stage 2 LPFP upgrade installation.

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    • #3
      Originally posted by Steve @ BMS/Fuel-It! View Post
      You'll need to do a proper WOT log and don't short shift. If it's doing it on it's own, then it may be an issue with the trans.
      I didn't realize that the trans could even be a factor being a manual. Just in case, I'll clarify a bit more. After i shift then let the clutch out, It's like something is killing the motor for a few seconds after getting back on the throttle. Then after those few seconds, the car springs back to life and ripps again.

      I will definitely grab some WOT logs tho. Thanks!
      2008 e90 6mt
      FBO/BMS meth
      19t turbos
      2" inlets
      G5 iso
      back end flash
      fuel-it stg 2

      Comment


      • #4
        Yeah, that's where NLS usually comes in so I doubt the changes I stated will help as I missed the 6MT portion of your first post.

        Click on our banner to visit our website!
        Video of our Stage 2 LPFP upgrade installation.

        BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

        Comment


        • #5
          UPDATE... I'M AN IDIOT!!

          As i was about yo do some wot logs, I decided to double check settings... option 4 was set to 3 for some reason! Ran the car a few times, no issues.. I'm grateful it's fixed, but damn I feel stupid.
          2008 e90 6mt
          FBO/BMS meth
          19t turbos
          2" inlets
          G5 iso
          back end flash
          fuel-it stg 2

          Comment


          • #6
            No worries...I appreciate you double checking your settings.

            Click on our banner to visit our website!
            Video of our Stage 2 LPFP upgrade installation.

            BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.

            Comment

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