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Thread: .cax question

  1. #1
    Senior Member mowton's Avatar
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    Default .cax question

    First I will say that I am not that familiar with the.cax process and will study it tonight but would like an answer to what will probably be a stupid question.....can you identify a .cax file in a tune/os file which you pull from a vehicle? If so how? The reason I ask, we suspect there is one in there and would like to remove it.

    In the mean-time, we are writting over the PCM with a GM fresh OS/cal via Tech II.

    Thanks and be gentle :-)

    Ed M
    2004 Corvette Coupe, LS2 Shortblock, MN6, Vararam, American Racing Headers/CATs, Magnaflow, 4:10's, Trickflow 215 Heads, 30# SVO, Vette Doctors Cam, Fast 90/90, Performance Clutch, DTE Brace, Hurst shifter, Bilsteins etc.....480 rwhp and 430 rwtq

    ERM Performance Tuning -- One stop Learning Center...from tuning software help to complete custom tunes
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  2. #2
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    The .cax file does not end up "in the tune". The .cax file simply gives you access to adjust some parameter which efilive hasn't given you access to.

    A good example is the cax file B9021 in the Gen3's, which allows us to modify the Minimum Transient Pulsewidth. HPT has that parameter available as "Min Fuel Milligrams", but Efilive does not give you that parameter so you need the cax file to get access to it.

  3. #3
    Senior Member mowton's Avatar
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    Quote Originally Posted by statesman View Post
    The .cax file does not end up "in the tune". The .cax file simply gives you access to adjust some parameter which efilive hasn't given you access to.

    A good example is the cax file B9021 in the Gen3's, which allows us to modify the Minimum Transient Pulsewidth. HPT has that parameter available as "Min Fuel Milligrams", but Efilive does not give you that parameter so you need the cax file to get access to it.
    Thank you for the response, I understand now. So there is no traceable evidence that any of these hidden tables have been altered? Also, if you suspect this, you can erradicate it with a rewrite of the calibration only?

    Thx,

    Ed M
    2004 Corvette Coupe, LS2 Shortblock, MN6, Vararam, American Racing Headers/CATs, Magnaflow, 4:10's, Trickflow 215 Heads, 30# SVO, Vette Doctors Cam, Fast 90/90, Performance Clutch, DTE Brace, Hurst shifter, Bilsteins etc.....480 rwhp and 430 rwtq

    ERM Performance Tuning -- One stop Learning Center...from tuning software help to complete custom tunes
    visit our website: www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning
    C5edstoy@aol.com

  4. #4
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by mowton View Post
    Thank you for the response, I understand now. So there is no traceable evidence that any of these hidden tables have been altered? Also, if you suspect this, you can erradicate it with a rewrite of the calibration only?

    Thx,

    Ed M
    If you have the cax installed (copied) for that OS in your EFILive V7 software, then when you open that parameter and compare it to stock, you will see if it has been changed.

    If you don't have the cax for that OS then you will not be able to tell if that parameter has been changed.

    A cal-only flash should rewrite it...

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