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Thread: 2.4 L, oem 2.0 turbo/manifold on it, boost spikes then falls off hard

  1. #1
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    2.4 L, oem 2.0 turbo/manifold on it, boost spikes then falls off hard

    What boost should these be able to make? With a manual controller on it spikes to 8.7 falls to 3 psi. Turn controller up a bit it makes 15 psi and falls wayyy back to 6 psi
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  2. #2
    Senior Tuner cobaltssoverbooster's Avatar
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    where is your tune file?
    2000 Ford Mustang - Top Sportsman

  3. #3
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    Quote Originally Posted by cobaltssoverbooster View Post
    where is your tune file?
    Tune file doesnt have anything to do with it, its a manual boost controller
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  4. #4
    Senior Tuner cobaltssoverbooster's Avatar
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    Dec 2008
    Location
    Nevada
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    4,452
    your traction control torque value climbs to 30% during the pull.
    the traction control etc setting is active in the tune.
    the supercharger boost control settings are active in the tune. one of the settings in there references 140 kpa pressure and in your log i see your file hovering right at that value.

    try disabling the control features and see if it picks up. etc systems are notorious in the gm world for throttling back.

    I feel a little attitude coming from your last response. let me clue you in on what we deal with here.
    1) we cant stand in front of your car and make valid assumptions as to mechanical conditions, we are on the other side of a computer connection.
    2) since we cant be there, all we have to physically put our eyes on is your tune file and the logs that are associated with its performance.
    3) this ones just me: i looked at the log and saw something i felt i needed to question the tune file for and thus the request for the file.
    4) we cant help you if your not going to be open to all of the possibilities.

    i'm not wasting the slim amounts of free time i have on someone that wont be open to all feedback.
    i have been really questioning my time spent here reviewing files and logs to try my best to offer guidance to users who seem stuck. I don't always offer the solution but sometimes something that gets said triggers a memory or a thought that ends up fixing the problem.

    Good luck with your problem. Ill watch from the back.
    Last edited by cobaltssoverbooster; 02-13-2020 at 12:20 AM.
    2000 Ford Mustang - Top Sportsman

  5. #5
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    I don't see any throttle closure, timing pulled or anything as a result of that? I'll try and see