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Thread: cos 5 timing going to 0 at high rpms

  1. #1
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    Default cos 5 timing going to 0 at high rpms

    Looking for help has anyone seen this happen car doesnt do it off the nos.
    IT will pull timing to 0 around 7600 rpms.

    Doesnt do it off spray this is a very fast 6 speed car if we can get every thing working with nos it has a chance at being the fastest 6 speed car.
    Here is couple logs one with some bent valves(didnt like wot 2,3shift off big wheelie after it recovered from clutch draging it down), 9150rpms 418 inch 6.0
    Attached Files Attached Files

  2. #2
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    If this is a cos tune then post it up. What are we supposed to be looking at in those logs. Lots of tables could be causing issues. Log with some spark pid tables. Something to do with the cos tables I would think.
    Last edited by slows10; September 18th, 2011 at 01:37 PM.
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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    What is the engine setup what cam? I think 8000 rpm is the limit if the ecm, unless a cos is different.
    Last edited by slows10; September 18th, 2011 at 01:35 PM.
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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    Quote Originally Posted by slows10 View Post
    If this is a cos tune then post it up. What are we supposed to be looking at in those logs. Lots of tables could be causing issues. Log with some spark pid tables. Something to do with the cos tables I would think.
    Remember its fine na 31 degs timing 20 passes,here is tune for first and second log

    Its 8000 rpm max thats all it needs to run,really done around 7600 just 8000 in lights to max its et.
    Attached Files Attached Files

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    Quote Originally Posted by slows10 View Post
    What is the engine setup what cam? I think 8000 rpm is the limit if the ecm, unless a cos is different.
    You are correct, however the ECM will continue to use the closest value
    regardless how high the RPM goes. I would shift at 8500 or look into
    an aftermarket ECM ( Motec, FAST, BigStuff 3 )

    -Justin

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    [QUOTE=L31Sleeper;155610]You are correct, however the ECM will continue to use the closest value
    regardless how high the RPM goes. I would shift at 8500 or look into
    an aftermarket ECM ( Motec, FAST, BigStuff 3 )

    -Justin[/QUO
    no need to shift at 8500 when we shift at 7600

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    Sorry I was still typing when you posted last.

    -Justin

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    Are you sure it's not a glitch in the log ?? This might sound dumb but try
    logging just timing and RPM. That way you will get the highest frame rate
    for those parameters.

    -Justin

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    every things works great except revlimiter slow and the mistry 16 degs timing being pulled lol

  10. #10
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    car misses when it does it,we are logging though v2

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