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Thread: speed/RPM limit cancel!!

  1. #1
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    Exclamation speed/RPM limit cancel!!

    Hi ALL,
    I am new to TUNING, my question is I want to cancel the speed limit on my sierra 2500HD 2008 I can't pass the 180 KM/h, and one more thing I've heard that my engine uses 4 cylinders at low speeds then uses the total 8 cylenders on high speeds is there a way to cancel it??

    and finally is Gen IV V8 my engine's name or vortech V8??? thanks a lot
    I know my questions might sound EEzZZ for you guys but i really need your help thanks a lot
    cheers

  2. #2
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    You can remove the speed limiter and change AFM activation (or turn it off if you wish) in EFILive.

    You have a Gen IV 6.0L V8 that is a Vortec 6000 (I assume since its a 2500HD its the 6.0L V8 and not the 5.3), its actual RPO code (or what GM calls it) is something different. Use wikipedia to look that up.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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
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    Quote Originally Posted by ScarabEpic22 View Post
    You can remove the speed limiter and change AFM activation (or turn it off if you wish) in EFILive.

    .
    thnx mate but how??? in efilive how to do it?? forgive me am tottaly new here thnx a lot

  4. #4
    Lifetime Member GAMEOVER's Avatar
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    You can keep it from going into 4 cylinder mode by going into EFI Live, look up the table for AFM which is {B0921}and set it to "NO" and for the speed limiter look up table {H0129} and set it at whatever speed you want!!! Be careful and don't go faster than the speed rating of the tires....
    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

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  5. #5
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    thanks alot GAMEOVER!!

    quoting : Be careful and don't go faster than the speed rating of the tires....
    looooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooool

    thanks to every one

  6. #6
    Forum tyhee Site Admin GMPX's Avatar
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    There is a lot of speed limiter methods in the E38.
    If you look in the Speeo section you will find the speed limiter group. The important one is {H0156} Speed Limiter Source, you will need to set that to ECM as well.

    But as the warning in the software states: - ** CAUTION ** Do not set the vehicle speed limiter above the speed rating of the tires fitted to the vehicle.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  7. #7
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    What those guys said!

    Cant speak for AFM as neither of my TrailBlazers have it so no idea how to turn it off, bet if I played with it for a few mins I could get it down though.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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.

  8. #8
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    Hi, thanks alot every one, today was my first time to use the EFILIVE, here are my questions: GMPX u mentioned ;The important one is {H0156} Speed Limiter Source, you will need to set that to ECM as well.
    i went to that one and its written: Other Module, should i write ECM instead??
    ive changed {H0129} to 200 KM/h and left the other parameter as they are 158 KM/h and reflashed my PCM and its the same my car didn;t exceed 158 :( wHYYY!!

    finally I went to {B0921} as GAMEOVER said ; searched for AFM and I found it already set NO,,, and here are the parameters : No
    625.000000
    625.000000
    625.000000
    625.000000
    625.000000
    625.000000
    3000.000000
    3000.000000
    3000.000000
    3000.000000
    3000.000000
    3000.000000
    5.999756

    it is set as NO but it felt like it IS YES!!! plz guys help me out here

  9. #9
    Lifetime Member GAMEOVER's Avatar
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    Post up your Tune File.....So we can look at it.....
    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

  10. #10
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    here ...this is the stoke file,,
    thanks a lot
    Attached Files Attached Files

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