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Thread: PE changes to 14.44 halfway through dyno pull??

  1. #1
    Tuner in Training
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    Jul 2014
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    PE changes to 14.44 halfway through dyno pull??

    i have a 2012 ss camaro with a magnuson kit in the shop. we put long tube headers on it and put it on the dyno. It had the tune from magnuson in it...first pull its rich at 10.5 then halfway through the run goes to 13.5~. PE table is 1.24 to 1.25, MAP enable is 15kpa, rpm is 300, 0 delay and TPS enable is 30%. i got the AFRs tuned in and it fuels within a couple percent at 11.7 then the commanded AFR goes to 14.44 around 5300rpm. Error percent stayed close even when it leaned out. Out of the 7 pulls only 1 commanded 11.7 through the whole run. Changed every parameter i could find that had the ivt, ect , iat, or rpm that i was seeing when the commanded afr changed.

  2. #2
    Disable desoot mode. Post tune...
    2008 Corvette
    UPP Twin turbo T4 67mm BB billet wheel kit
    427 LME Billet Setup
    Fore Innovations Triple 465 L4 Setup
    FIC 2150 injectors
    RPM TH400/9 inch
    Pro Torque Bolt Together Converter
    MaxxECU Stand Alone

  3. #3
    Tuner in Training
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    Tried disabling desoot and it didnt work.

    2012 camaro ss supercharged tuned.hpt

  4. #4
    Advanced Tuner
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    log?

  5. #5

  6. #6
    Advanced Tuner
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    On that log the commanded stays down in the 11's for the whole run and your wideband is reading in the 10's. Do you have a log of the issue?

  7. #7
    Advanced Tuner
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    everything looked ok reading wise on that log - afr stayed at commanded - your running rich by about 1.5 afr lower so you need start removing fuel to get the actual vs commanded closer

  8. #8
    Senior Tuner SultanHassanMasTuning's Avatar
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    make sure your not getting any spark miss/blowout that would show lean

    also your injectors/fuel pump as in check
    Follow @MASTUNING visit www.mastuned.com
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  9. #9
    Tuner in Training
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    Here is log where its doin it pull4 lean out.hpl

  10. #10
    Tuner in Training
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    I logged fuel cut type and as soon as the afr commanded changed it went from none to unknown:00 02. I emailed support about.

  11. #11
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    Try setting the EQ Ratio Min to your desired WOT PE. Go to Open Loop/Base > Misc on the upper right side.

    And on a boosted vehicle, I set the PE throttle to 5% and change the enable Map to 100 KPA.

    Russ Kemp

  12. #12
    Any updates?
    2008 Corvette
    UPP Twin turbo T4 67mm BB billet wheel kit
    427 LME Billet Setup
    Fore Innovations Triple 465 L4 Setup
    FIC 2150 injectors
    RPM TH400/9 inch
    Pro Torque Bolt Together Converter
    MaxxECU Stand Alone

  13. #13
    Advanced Tuner
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    Feb 2015
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    Perth, Australia
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    974
    try maxing all in gear torque values for all RPM,

    also disable fast torque EXIT

    also log torque, trans torque, shift TM all TM sources and try to narrow down which TM it is. log MAP sensor voltage too