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Thread: how get pcm to use idle under/overspeed instead of cracker airflow while rolling?

  1. #21
    ok, thanks. It usually deviates by about 2. I'll go ahead and narrow that up. Maybe it is the cause of engine dieing when I turn into parking spot. Maybe learning bad trims on decel?

  2. #22
    Quote Originally Posted by LSxpwrdZ View Post
    If you want that then simply zero the cracker and follower tables out and then set the enable/disable speed to 250+mph then once tps reaches below idle zone and lower than the TPS setting in the follower table to zero out the follower it'll kick into idle adapt and use spark and PID idle control.
    I'm gonna put the throttle cracker enable speed high again and double check but I don't think that forced it into idle over/under speed spark control while rolling like I'm trying to make it do. I'll check again and post of log of the actual events.

    I don't see a tps enable setting in the follower or cracker table.

    Thanks for helping guys.

  3. #23
    My rolling idle airflow and rpm is zero'd from the oem. Does this mean it isn't a working function on this car?
    I'm gonna figure out something to put in there and see what happens.

  4. #24
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by ericwilloughby View Post
    My rolling idle airflow and rpm is zero'd from the oem. Does this mean it isn't a working function on this car?
    I'm gonna figure out something to put in there and see what happens.
    Copy over from mine for now

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
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  5. #25
    I got it.

    My throttle cracker enable and disable speeds were set so low the under/over speed couldn't function until the car stopped. I set the cracker disable to 10 mph and that fixed it. I gotta work on the transition between the two but I know what's goin on now.

    And the rolling idle enable was set to 255 from the factory. Like LSxpwrdZ said, rolling idle is for when the clutch is pressed in so it wasn't working at all. And rolling idle airflow was zero OEM. It still looks like rolling idle rpm does nothing?????

    Thanks for all the help
    Last edited by ericwilloughby; 01-31-2015 at 04:58 AM.

  6. #26
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by ericwilloughby View Post
    I got it.

    My throttle cracker enable and disable speeds were set so low the under/over speed couldn't function until the car stopped. I set the cracker disable to 10 mph and that fixed it. I gotta work on the transition between the two but I know what's goin on now.

    Thanks for all the help
    No problem, your welcome.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]