Page 2 of 3 FirstFirst 123 LastLast
Results 21 to 40 of 42

Thread: HELP Request [REP] - Reduced Engine Power - Twin Turbo 427 Corvette

  1. #21
    Advanced Tuner Montecarlodrag's Avatar
    Join Date
    Nov 2009
    Location
    Pegasus Galaxy
    Posts
    919
    I have used the LS2 TB with adapter harness on some C5 Vettes, they all worked fine but none of them is boosted. IIRC the TB is reversed to make it fit so the blade may be moving or something is upsetting the TAC. The strange thing is that the codes you get are airflow related, not electrical.
    Hope you can go to the track and test, I may have to boost a 03 Z06 with a Fast intake and LS2 TB soon.
    9 sec Montecarlo SS

  2. #22
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Lot's of rain this weekend, so the tracks were closed. There may be a window of opportunity on Tuesday night depending on how the weather plays out. I'm really wanting to test it out but the only way is to get on a well prepped track surface.

  3. #23
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    If it's not one thing it's another. I was planning to go to the track today, but noticed the clutch seemed to be dragging. I did a fluid change, bled the clutch, adjusted the tick master cylinder all the way and the car still wants to creep forward when putting it in gear.

    The slicks were already bolted on and the weather was nice so I figured I would take a quick spin. I did a launch in a safe spot and REP Mode kicked in.

    The following posts will contain some of the data that I was able to log. I wasn't sure which PIDs to grab so I went with TPS, ETC Pedal Position, and ETC Desired Position. The only one I didn't log was ETC Position.

    Does anyone know the difference between all of them?

    I'm getting a P1515 DTC and using a file with all of the changes that were discussed previously.

  4. #24
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    #HPTunersREPMode #ReducedEnginePower

    Here is the 1st time it happened today after I went and got the laptop.
    This is at the launch and engagement of the clutch. You can see that I had the throttle static for a moment. This is a bad habit from the street racing days when the car was traction limited.


    I then went 100% throttle and the tires started really spinning. I pedaled it and the computer seemed to handle it.


    However, when TPS was rising, and ETC Pedal was decreasing, the party was over.

  5. #25
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Here's one where I basically stuck with the plan. Just as the clutch engaged, I paused the pedal application but then kept going. The tires were spinning hard and I let out just before tagging the rev limiter hard. No REP occurred on this street launch.


  6. #26
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Any idea why ETC Pedal is at 107%


  7. #27
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Should I post up the associated log files?

    Is there anything else that needs to be logged to diagnose the issue or is this something that can't be solved without having special access via HPTuners?

  8. #28
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    I pulled the charge pipe tonight and verified that the throttle is opening 100% when pressing the pedal to WOT. I tried forcing the throttle into a position and got a P1516 code and REP.

    I sat in the car and practiced shifting while listening to the audio from an old 9 second pass. Nothing is repeatable from a throttle standpoint with each shift. I was logging every throttle pid except for the average.

    I'm beginning to wonder how much control if any that we have over the throttle and how much it is holding the car back at the track.

  9. #29
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Here is everything that has been changed to eliminate REP mode and it still goes into #HPTunersREP mode.

    P101 Error Table - maxed out




    Injectors Scaled 50% to stay below 2.32 g/cyl




    P1514 Error Table - maxed out



    MAF Cylair - maxed out




    Max Engine Torque vs RPM vs Gear - maxed out




    ETC TPS Max vs RPM vs %Max Available TQ - maxed out




    Drivetrain Abuse - maxed out




    Throttle Max Rotation% vs RPM - maxed out




    Throttle Max Rotation vs Pedal - Stock




    ETC Torque Management - Cylinders remain enabled


  10. #30
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    ETC DTCs set to where they will show a code




    APP DTCs set to where they will show a code


  11. #31
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    This issue has been around since 2007 and still not fully resolved:

    https://www.hptuners.com/forum/showt...6221#post86221

  12. #32

  13. #33
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    *Important Info*
    This is the code I am getting:

    DTC P1515 Control Module Throttle Actuator Position Performance

    Circuit Description
    The commanded throttle position (based on accelerator pedal position and possibly other limiting factors) is compared to the Actual throttle position. The 2 values should be within a calibrated range of each other. Both the PCM and the TAC module redundantly monitor the Commanded and Actual throttle position. This DTC sets if the PCM detects the problem.

    So:
    DTC sets if the "PCM detects the problem". The PCM and TAC module monitor Commanded and Actual Throttle Position, but the PCM sets the DTC. These two values need to be within a calibrated range.

    Would the calibration parameters be in the PCM?

  14. #34
    Quote Originally Posted by Turbo-Geist View Post
    *Important Info*
    This is the code I am getting:

    DTC P1515 Control Module Throttle Actuator Position Performance

    Circuit Description
    The commanded throttle position (based on accelerator pedal position and possibly other limiting factors) is compared to the Actual throttle position. The 2 values should be within a calibrated range of each other. Both the PCM and the TAC module redundantly monitor the Commanded and Actual throttle position. This DTC sets if the PCM detects the problem.

    So:
    DTC sets if the "PCM detects the problem". The PCM and TAC module monitor Commanded and Actual Throttle Position, but the PCM sets the DTC. These two values need to be within a calibrated range.

    Would the calibration parameters be in the PCM?
    I'll talk with one of the guys at the shop and see if we can be of any help to you...
    David
    Southern Car Parts
    www.southerncarparts.com

  15. #35
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    Key on Engine off logging


    If you keep it pinned all the way down and in my case at 108% ETC Pdl, it appears to stay wide open with KOEO. Just a 1% change (going to 107%) causes drastic changes in the throttle blade opening. Also, I've got logs from this test while practicing making shifts where:

    ------- Pedal----TPS----ETC----ETC Dsrd
    Shift 1-- 0 ----- 70 --- 16 ----- 28
    Shift 2-- 0 ----- 50 --- 10 ----- 73

    Then on another one:

    ------- Pedal----TPS----ETC----ETC Dsrd
    Shift 1--107 --- 20 ---- 71 ----- 100
    Shift 2-- 59 ----100 --- 83 ----- 65


    Nothing is repeatable. It should do the same thing every time. Has anyone ever logged this type of data?

  16. #36
    Tuner in Training Turbo-Geist's Avatar
    Join Date
    Aug 2010
    Location
    Texas
    Posts
    40
    A quick video shifting 1-4 actually using the shifter, gas, and clutch. I wasn't letting off the gas fully, but you can see the throttle blade slapping shut.


  17. #37
    Potential Tuner
    Join Date
    Apr 2017
    Location
    Tuscaloosa AL
    Posts
    1
    Did you ever get this figured out? I'm running through the same Issue with my NW102...

  18. #38
    figure this out!!?? have a buddy with TT setup and "boosted" NW 102 doing this shit.
    2008 Corvette
    UPP Twin turbo T4 67mm BB billet wheel kit
    427 LME Billet Setup
    Fore Innovations Triple 465 L4 Setup
    FIC 2150 injectors
    RPM TH400/9 inch
    Pro Torque Bolt Together Converter
    MaxxECU Stand Alone

  19. #39
    Senior Tuner
    Join Date
    Jun 2004
    Location
    Baltimore, Md
    Posts
    1,204
    Think he jumped off nearest cliff. in car.
    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

  20. #40
    Tuner
    Join Date
    Jan 2012
    Location
    chicago
    Posts
    94
    Quote Originally Posted by GrannySShifting View Post
    Think he jumped off nearest cliff. in car.
    LOL i have the same problem and no one can fix it.
    F1-x 26psi boost duel nozzle meth Alky kit
    6.0l 1999 C5 LS-1 6 speed manual.
    225,225/575,575 114lsa, 9.5.1 com, SD80inj LS2 Intake and ls2 90tb