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  1. #1
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    Consistant timing pull regardless of fuel source

    I keep getting timing pull when running 2nd - 3rd gear logs. I have traction control fully off, slow to let RPM's steady, then pull through the top of third.

    I've tried multiple stations, and have even tried running a 91 map on 93 fuel. Still end up with massive corrections across at least 5 cylinders.

    Map is Cobb Stg1 aggressive + FMIC.

    Take a look at my attached log and give me any ideas?

    7-31-13 1145 2nd to 3rd down 441s to 41n ramp - 7-31-13 Mobile 93 fill up on Prospect - Cobb St.zip

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    Mods are the Cobb tune, Injen DCI, and new style VRSF 7" intercooler.

  3. #3
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    Are you Auto or 6MT?
    What ROM type?
    The timing corrections are only occurring post shift, at least in this log. That's pretty normal, i would honestly not even worry about. If you wanted to be "extra safe" you could reduce your timing target in the load cells where you are falling post shift, but i really don't think its worth it.
    2011 E90 M3 \ Melbourne Rot Metallic

    Click here to enlarge

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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    Are you Auto or 6MT?
    What ROM type?
    The timing corrections are only occurring post shift, at least in this log. That's pretty normal, i would honestly not even worry about. If you wanted to be "extra safe" you could reduce your timing target in the load cells where you are falling post shift, but i really don't think its worth it.
    This. During the shift your actual boost is exceeding your req boost(i'm sure actual load is exceeding requested while this is happening) and then the timing corrections hit.
    Click here to enlarge
    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

  5. #5
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    Cool. Rom is Cobb 93 + FMIC, EJI0S ECU. Manual.

    Should I be logging load requested and actual? I could get rid of boost set point and LPFP actual.

  6. #6
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    Yes, try adding load channels. Also, try shifting slower and see how the car reacts/logs look.
    Click here to enlarge
    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

  7. #7
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    Click here to enlarge Originally Posted by str8shot Click here to enlarge
    I keep getting timing pull when running 2nd - 3rd gear logs. I have traction control fully off, slow to let RPM's steady, then pull through the top of third.

    I've tried multiple stations, and have even tried running a 91 map on 93 fuel. Still end up with massive corrections across at least 5 cylinders.

    Map is Cobb Stg1 aggressive + FMIC.

    Take a look at my attached log and give me any ideas?

    7-31-13 1145 2nd to 3rd down 441s to 41n ramp - 7-31-13 Mobile 93 fill up on Prospect - Cobb St.zip
    For a moment I was going to ask if you were using the open tablets 'ots' maps Click here to enlarge

  8. #8
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    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    Yes, try adding load channels. Also, try shifting slower and see how the car reacts/logs look.
    OK, I re-logged two runs today, which were 3rd gear only, no shifts. Started low in the tac, wide open to about redline.

    Logged requested and actual load as well. Still the same problem. Multiple cylinders pulling timing as soon as I get into the midrange.

    Does it still look OK, or is this symptomatic of some type of issue?

  9. #9
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    Boost and fuel control is solid but timing is just being pulled like crazy... I'm assuming you've tried different stations, correct? AT this point i'm almost thinking it's hardware related(plugs).
    Click here to enlarge
    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

  10. #10
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    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    Boost and fuel control is solid but timing is just being pulled like crazy... I'm assuming you've tried different stations, correct? AT this point i'm almost thinking it's hardware related(plugs).
    I've tried different stations, and even on Cobb 91, with 93 in the tank, I have the same problem.

    Plugs were replaced ~5k ago with Bosch OEM equivalents. Was starting to get a misfire.

    I'm thinking maybe I need to switch to NGK's and close the gap a little?

    Also, my low pressure fuel sensor is bad (throwing a 29F3). Not sure that would make a difference with timing, though.

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