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Thread: E35B Digital MAF Scaling

  1. #21
    Lifetime Member GMPX's Avatar
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    But that doesn't fix the problem of the scaling in the ECM where the airflow is currently set to 0x7F9E and you can't go over 0x8000 in value.
    I no longer monitor the forum, please either post your question or create a support ticket.

  2. #22
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    Now he should be caught up..

    Still leaves me wondering why the ECM can understand a 15khz signal but only 9khz is usable. Hardware and software guys must not chat much..

  3. #23
    Member koolky's Avatar
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    Quote Originally Posted by GMPX View Post
    I've just had a look at this and the axis is defined in 'uS', we converted those values to Hz because for most people that would make more sense. I think that is why we went for the fixed values because we couldn't do the uS > Hz conversion on the axis values. But there is a BIG problem, the axis is defined using 16 bit signed values (no idea why they used signed), so the maximum positive value is 0x7FFF, the end value at the top of the axis from factory is 0x7F9E, meaning there is nothing left, you can't go over 0x8000 or the numbers become negative. I think you are stuck with what is there unfortunately.
    Doesn't uS increase in value as Hz decrease? eg. 918 Hz = 1890 uS (0x7F9E) and on the other end: 8696Hz = 115 uS (0x0D89). Therefor if we want to see 15kHz aka 67 uS would we not be moving down in HEX (~0x07D0)?

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    Last edited by koolky; November 1st, 2017 at 12:47 PM.

  4. #24
    Member koolky's Avatar
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    Also, if I try to write a CAX for the AXIS I get the following:

    -----------------------------------------------------------
    Address Overlap Report
    The following calibrations have been excluded:

    - User calibration: 191E76 overlaps one or more EFILive calibration(s)

    User defined definitions may overlap other user defined definitions (to support interleaved axis/data definitions) by checking the option: View->Properties->[Options]->"Allow *.cax calibrations to overlap other *.cax calibrations."


    I have that option checked off.

  5. #25
    Lifetime Member GMC-2002-Dmax's Avatar
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    Any CAX you create cannot overlap an existing EFI-Live table.

    Disable the OS CALZ by temporarily renaming it.

    Then reopen the CTZ File, only the CAX you created will open up any table in the V7.5 Editor, resave the CTZ with the new values you altered in the file.

    Re-Enable the CALZ by properly naming it back to what it was.

    I do that for some of the other stuff I work with when the definition I want to change is already defined within EFI-Live's calz.
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  6. #26
    Member koolky's Avatar
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    kidturbo - try this CAX file and do what GMC-2002-Dmax mentioned in the last post. I guess you'll want to copy the axis into Excel to keep track of your row labels because the EFILive label won't change when you re-scale and re-enable the .CALZ

    12628594.txt

  7. #27
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    Thanks, I'll give that a try. Gotta order some more autocal's first. Sold last one with the licensed E35B I was testing on.

  8. #28
    Member koolky's Avatar
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    Quote Originally Posted by kidturbo View Post
    Thanks, I'll give that a try. Gotta order some more autocal's first. Sold last one with the licensed E35B I was testing on.
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