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Thread: Os 04073005

  1. #1
    Lifetime Member SS2win's Avatar
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    Default Os 04073005

    I've been collecting CAX files 12587603 and noticed the COS 5 is mentioned in the files but it's not on my machine and I can't find anything else on it. Does it exist by special order or are 12225074 and 12212156 the only ones available?
    2001 Camaro SS
    EFILive Custom OS3

  2. #2
    Lifetime Member GMPX's Avatar
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    It does not exist sorry, I'm not sure why there would be a reference to it.
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
    Lifetime Member SS2win's Avatar
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    I've been searching to see if COS5 and flex fuel are at thing but I only see two OS's supported. Am I missing anything?
    2001 Camaro SS
    EFILive Custom OS3

  4. #4
    Lifetime Member GMPX's Avatar
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    If there is only two COS5's on OS's that support FlexFuel then that is what you need to choose from.
    I no longer monitor the forum, please either post your question or create a support ticket.

  5. #5
    Lifetime Member SS2win's Avatar
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    I only see support for 12225074 and 1221215 in 'C:\Users\New Owner\Documents\EFILIVE\V7.5\Bins\Custom OS" neither of which have flex fuel.
    2001 Camaro SS
    EFILive Custom OS3

  6. #6
    Lifetime Member SS2win's Avatar
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    Oops! Nevermind... I found some posts that explain the situation and I'm only 10 years or so behind the curve. SNAFU!

    The reason I was asking is I picked up a 95 Z/28 LT1 Torqhead conversion that has flex fuel and it got me thinking I'd like to update my SS to match. The problem is I don't want to loose my RoadRunner and the only 512M OS that supports flex fuel, 12216125, does not have a COS written for it. So I started looking at 1M PCM's and saw there's no COS5 for them... not the end of the world but between the two features, a pretty big loss to get flex fuel. I can use COS3 but saying bye to my Roadrunner is just sad...

    Back when the COS was being developed, I never though twice about it because E85 was rare and the sensors were expensive! I guess there just wasn't enough available room in 12216125 to do it? (not that I expect you to start now but it would be nice lol)
    2001 Camaro SS
    EFILive Custom OS3

  7. #7
    Lifetime Member GMPX's Avatar
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    Yes I remember the sensors were very expensive back then.
    However for my own curiosity I had a look at 12216125 and yes indeed that binary is full! Approx 1000 bytes spare in the whole 512K so not enough to do what we need for a COS. Probably why GM started rolling out the 1Mb PCM in 2003.
    I no longer monitor the forum, please either post your question or create a support ticket.

  8. #8
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    This is probably why custom OS wasn't done (of course Ross is correct)... you are looking to do Nitrous with E85? I know it has been done on the 1mb ecms.
    "All that is needed for the triumph of evil is that good men do nothing..."

  9. #9
    Lifetime Member SS2win's Avatar
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    No just trying to decide on staying with P01 or P59...
    2001 Camaro SS
    EFILive Custom OS3

  10. #10
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    P59>>>>>>>>>>p01
    "All that is needed for the triumph of evil is that good men do nothing..."

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