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Thread: 3 (E38) engine swaps/conversion's rev limiting at 5,500RPM's

  1. #1
    Lifetime Member GAMEOVER's Avatar
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    Default 3 (E38) engine swaps/conversion's rev limiting at 5,500RPM's

    (2) 2007 5.3ltr & (1) 2008 6.0ltr
    Originally rev limit's were set to 6300-6500RPM's but none of the engine's would rev past 5,500RPM's...so I went thru and set every rev limiter function to 8,000RPM's to try and figure which function in the Tune was causing this and nothing...All 3 vehicles are mated with TH350 transmission's
    I attached a 2007 5.3 file
    Attached Files Attached Files
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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    Hmmm, hate to say it but is there any way you could run a manual OS, like one from a Vette? Wonder if thats messing with anything running an auto OS without having a TCM to communicate with.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  3. #3
    Lifetime Member GAMEOVER's Avatar
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    I don't know Erik, but I can't figure it out...
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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    Oh I know what it is!

    With an auto OS and no TCM, the ECM thinks its always in Park or Neutral! Change those limiters and Im willing to put $$ on that being the issue.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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    Lifetime Member Tre-Cool's Avatar
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    if there running a turbo 350/400 i would run a manual os for sure.

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    Lifetime Member GAMEOVER's Avatar
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    Quote Originally Posted by ScarabEpic22 View Post
    Oh I know what it is!

    With an auto OS and no TCM, the ECM thinks its always in Park or Neutral! Change those limiters and Im willing to put $$ on that being the issue.
    Already tried that, I changed all those limiters to 8,000RPM's and it didnt make a difference...
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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    Hello Gameover,

    I'm guessing that with the TCM communication being absent the ECM is coming up against a torque limiting table that we do not have access to. The ECM will also not be receiving a VSS signal - as the TCM sends the VSS via GMLAN / CAN BUS.

    A manual tune in the ECM would allow for direct VSS input, and should resolve your RPM issue.

    Just a guess ... still the Gen III guy ... working on Gen IV R&D day by day.


    Regards,
    Taz

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    Lifetime Member GAMEOVER's Avatar
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    Ok, gonna need to find a Manual Pinout for the E38 ecm because all I have is automatic pinout's...
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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    Hello Gameover,

    Let me know what ECM manual tune you are going to use (i.e. 2007 Corvette LS2, etc.), and I will get you the pinouts.


    Regards,
    Taz

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    Lifetime Member GAMEOVER's Avatar
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    Taz, I guess I'll try a 2007 & 2008 LS2 6.0 manual tune if you got them...

    Thanks in advance...
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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