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Thread: C5 blower car, TB coding reduced engine power STOCK TB

  1. #1
    Senior Tuner
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    C5 blower car, TB coding reduced engine power STOCK TB

    Seen some of the aftermarket TBs give headache with this but this one has me scratching my head for minute

    Tried maxing out every airflow table it could exceed I could think of, still does it on street. On dyno had no issues making pulls, but roll in it in 3rd and 5500-6500 somewhere itll limp it like clock work almost. I did notice Accelerator Pedal Average and Pedal Position goes to 100% at same time, and then Pedal Position jumps to 120% all the sudden. Tried to watch the raw tps falling and rising voltages but Scanner doesnt let you see that on these. And looking at scan again TPS SAE shows 50% then jumps to 100% at same time??? Didnt notice this because TPS in graph looks completely normal

    This thing made very good power on dyno (cam only boost on pump gas made 695 to the tire) but need to get this sorted out. He had some door module wiring gremlins with the car previously but nothing presented itself like this
    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
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    Also just noticed PE was delayed unti 4000 rpm if you look at timestamp 7:21:53 - seeing what looks like a lot of frozen data, that appears to be linear if you look at the graph
    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

  3. #3
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    weak control motor in the tb perhaps?
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  4. #4
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    Baltimore, Md
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    Any clues? As to why PE was delayed?
    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