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Thread: PLEASE HELP Stalling issues on C5 supercharged Vette

  1. #1

    PLEASE HELP Stalling issues on C5 supercharged Vette

    I have my brothers car while he is serving overseas and ended up getting a A&A big bubba BOV instead of the vulture motorsports sleeper it had on it. (http://www.ebay.com/itm/New-SLEEPER-...a0b772&vxp=mtr)

    The car was running great but when I installed the new "Big Bubba" I am getting stall issues. The idle dips bad down to 500 rpms then goes back up to commanded idle. I pressure checked the whole system and all is good. I bought the valve because it stays open at idle and non- boost to take pressure off the head unit. The valve is open at idle and closes properly when you rev it up. I have tried tightening the cap and still the same. Andy says it has to be a tuning issue but Im not sure what Im supposed to change.

    It doesn't stall all the time. Usually only when its warmed up. Today while going in reverse once I stopped it stalled. I ended up putting the vulture BOV back on and it doesn't stall anymore. Problem is it build pressure at idle and I thought this is bad for the PSC1 unit.

    Anybody have any advice in which direction to take to make the Big Bubba work? Car runs 7-8 psi boost. No other issues. Car was professionally tuned .

  2. #2
    Tuner
    Join Date
    Sep 2013
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    SF Bay Area , California
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    You're gonna need to increase the "Idle Airflow" with the big bubba installed. You may also need to adjust fueling at idle too.
    2001 Z06 : 856/830 : Built LQ9 403ci : D1SC 17psi : Self-built , self-tuned.

  3. #3
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
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    Florida
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    3,773
    Log idle and cracker/follower pids with original BOV and the new one to see the effects and formulate an update to bring the values back into line.

    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

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  4. #4
    This is the current tune and a log, unfortunately it didnt stall but maybe someone here can help me out with a tweak. This is with the Big Bubbas BOV on the car. Just want to see if anything sticks out to anyone.
    Attached Files Attached Files
    Last edited by 4horseman; 03-05-2015 at 11:12 AM. Reason: add

  5. #5
    Here is a log file with the old BOV installed. Tune is same except for some transmission tweaks done around Christmas
    Attached Files Attached Files