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Thread: No AFR change with VE changes

  1. #1
    Tuner in Training
    Join Date
    Jan 2011
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    29

    No AFR change with VE changes

    Been tuning a Twin Turbo 5.3 swapped sandrail and having problem getting the AFR's in line above 4500 rpm.
    Fuel pressure is good.
    Injector PW isn't changing either.
    Ideas?

    Also, dies on decel on the dyno.
    Attached Files Attached Files

  2. #2
    Senior Tuner Mep_q8's Avatar
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    Mar 2006
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    Kuwait
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    Wow, you really need to check out your tune before you blow something up! Are you running E85? What kind of plugs?

    Email me if you need help.

    Bader Norris
    MEP Tuned
    Telephone: +965-55446651
    Email: [email protected]
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  3. #3
    Advanced Tuner
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    Aug 2012
    Location
    SV, AZ
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    Based on Trailblazin's comment I'm gonna guess it's not working because you don't know what you're doing...

    Good luck.

  4. #4
    Senior Tuner
    Join Date
    Nov 2002
    Location
    Central Florida
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    2,503
    I get an unfamiliar popup saying the file is created with a
    newer version than I have, and can't be opened. This is
    the "scaling change" one. I have a fairly fresh 2.24.xxx
    installed on this machine.

    So let's begin with some basics. Is this a SD-only tune,
    and is the injector PW at 4500 and above, limited by the
    PCM fuel delivery calculation or by the 100% duty cycle
    limit (function of RPM, decreasing)?

    And lastly, can you say for sure that your AFR readings
    are true and not compromised by some other thing like
    misfiring, incomplete combustion, spark blowout at high
    boost?

  5. #5
    HP Tuners Support
    (foff667)
    Bill@HPTuners's Avatar
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    Jun 2004
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    28,247
    dtc's are setup wrong.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"