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Thread: Cax file to mimick COS5?

  1. #1
    Lifetime Member Kevin Doe's Avatar
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    Default Cax file to mimick COS5?

    I'm not very familiar with CAX files, and what you can do with them. But, I have a 1MB OS, on my 2004 GTO PCM. There is no COS5 available, and EFI Live is not willing to develop one, (I even offered to pay for it). Can a cax file be used to basically make my own COS5? Right now I'm using COS3, but I really want the COS5 features. If someone is willing to make me a COS5 I would be willing to pay you. I just don't have the knowhow.

    Just because it looked cool.

  2. #2
    EFILive Developer Site Admin Blacky's Avatar
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    No a cax file can't be used to implement a custom operating system. Cax files can only configure EFILive to modify the calibrations. COS5 (and all custom OS's) have had changes made to the executable code to make them operate differently than the normla GM software.

    Regards
    Paul
    Before asking for help, please read this.

  3. #3
    Lifetime Member Kevin Doe's Avatar
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    Well damn. There went that idea. So who can I paypal to make a COS5 for the 1MB PCMs? :lol:

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    EFILive Reseller ringram's Avatar
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    If you have enough $ Im sure Ross would do it. But you might need a lot
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

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    Can't you just change PCMs?
    "All that is needed for the triumph of evil is that good men do nothing..."

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    Lifetime Member Kevin Doe's Avatar
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    I suppose I could, but that would require a wiring harness chnage as well. My engine is in an RX-7, so a lot of the harness is customized, and it would take a lot of rework to make a different PCM work.

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    Quote Originally Posted by Kevin Doe View Post
    I suppose I could, but that would require a wiring harness chnage as well. My engine is in an RX-7, so a lot of the harness is customized, and it would take a lot of rework to make a different PCM work.
    No it wouldnt. The harness doesn't need to be changed, just the ends need to be pinned for the correct year of PCM. I put a 2001-2002 PCM into my 1998 L31 and had to swap every single pin to the new style connectors. Was very simple and easy and took maybe an hour with a schematic.

    Or you could just build a harness adapter using a junk ECM and some connectors. Several have done this on the PA & A forum and here.

    All you need to know if what year harness is in the RX-7 and what vehicle is it from. What modifications are done to it. Then you need a schematic from an earlier COS5 capable vehicle and make yours match the new one.

    Two sheets of paper, some tools and about 1-2 hours of your time. Done.

    If you lived in Los Angeles, I'd be willing to do it with you in person and walk you through it.

  8. #8
    Lifetime Member Kevin Doe's Avatar
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    I had thought about that before, but I wasn't sure what was all involved.

    My harness is from a 2004 GTO originally. If I were to change to a differenet PCM and re-pin my harness, what PCM would be the ideal one to go with. Since I don't have one, I'd assume there would be a best one to pick.

  9. #9
    Joe (Moderator) joecar's Avatar
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    And you need the Metri-Pack pick tool to "pick" the pins out of the connector.

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    Lifetime Member Biggsy's Avatar
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    Quote Originally Posted by joecar View Post
    And you need the Metri-Pack pick tool to "pick" the pins out of the connector.
    or a small jewellers type screwdriver if you are a cheapa$$ like me!
    Dave.

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