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Thread: Lean Cruise, the real story

  1. #1
    Forum tyhee Site Admin GMPX's Avatar
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    Default Lean Cruise, the real story

    Like the old fill the tank with new fuel to reset the Octane scaler internet myth, there appears to be another one gaining popularity. That myth is that Lean Cruise actually functions on non Holden cars, both EFILive and HPTuners have explained that just setting the calibration variables like a Holden will not give Lean Cruise on a non Holden Platform.

    For those that can read (or rewrite) assmebler code, here's the actual check in the PCM operating code to ensure Lean Cruise will not function unless the vehicle is a Holden.

    EFILive does NOP encourage you to change this code :wink:

    Cheers,
    Ross

    moveq #2,d1 ; #2 = Platform is Holden
    cmp.b (byte_0_1E5C5).l,d1 ; Check against Platform type in cal
    bne.s loc_0_29A96 ; If not the Holden then skip Lean Cruise
    jsr sub_0_2F68E ; Jump to Lean Cruise Subroutine

    loc_0_29A96:
    jsr sub_0_38372 ; Jump to Knock control subroutine
    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.


  2. #2
    EFILive Reseller wait4me's Avatar
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    Default

    Exactly, Thanks ross for making it proven. No one beleives me...
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  3. #3
    Lifetime Member 87gmc's Avatar
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    so even if a full flash from a holden bin to lets say a camaro pcm, im talking a full flash not just the cal

  4. #4
    Lifetime Member 87gmc's Avatar
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    Default Re: Lean Cruise, the real story

    Quote Originally Posted by GMPX
    moveq #2,d1 ; #2 = Platform is Holden
    cmp.b (byte_0_1E5C5).l,d1 ; Check against Platform type in cal
    bne.s loc_0_29A96 ; If not the Holden then skip Lean Cruise
    jsr sub_0_2F68E ; Jump to Lean Cruise Subroutine

    loc_0_29A96:
    jsr sub_0_38372 ; Jump to Knock control subroutine
    I'm an accountant not an engineer :lol:

  5. #5
    Lifetime Member SS2win's Avatar
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    so you just put the holden id in the vin? lol
    2001 Camaro SS #2020
    Stock LS1 w/InconTT | REV Springs | Ti retainers | M6 | McLeod Twin Clutch
    UMI RR K Member | SLP Subframe Connectors | Global West TA | BMR PHB | Metco LCA
    996 Brake Kit| 17" CCW Classics | 17x11 ZR1 Replicas on all four corners

    425@6lbs | ???@12lbs | EFILive Custom OS3 | !MAF | SD
    11.73@12x/1.7 on worn out nittos... yaaawn!

  6. #6
    Forum tyhee Site Admin GMPX's Avatar
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    It won't help.

    The ONLY way around this is to modify that platform check routine, or change the platofrm type to Holden in the calibrations (we don't allow you to do that), that will cause other problems anyway.

    The fact that GM went to the trouble of checking what platform type it is means that they were probably directed by those in power to do so.

    Sorry,
    Ross
    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
    Lifetime Member 87gmc's Avatar
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    Quote Originally Posted by GMPX
    It won't help.

    The ONLY way around this is to modify that platform check routine, or change the platofrm type to Holden in the calibrations (we don't allow you to do that), that will cause other problems anyway.

    The fact that GM went to the trouble of checking what platform type it is means that they were probably directed by those in power to do so.

    Sorry,
    Ross
    Ok back to B3647 for me

    Hey Ross tomorrow ill check out what you told me to do in checking state 05 for the B3647 table

  8. #8
    Lifetime Member SS2win's Avatar
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    ok so replace the jump with a nop.. lol I'm not a programmer...
    2001 Camaro SS #2020
    Stock LS1 w/InconTT | REV Springs | Ti retainers | M6 | McLeod Twin Clutch
    UMI RR K Member | SLP Subframe Connectors | Global West TA | BMR PHB | Metco LCA
    996 Brake Kit| 17" CCW Classics | 17x11 ZR1 Replicas on all four corners

    425@6lbs | ???@12lbs | EFILive Custom OS3 | !MAF | SD
    11.73@12x/1.7 on worn out nittos... yaaawn!

  9. #9
    Forum tyhee Site Admin GMPX's Avatar
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    Quote Originally Posted by SS2win
    ok so replace the jump with a nop.. lol I'm not a programmer...
    Yeah, that would work if YOU want to do that, we won't.

    Cheers,
    Ross
    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.


  10. #10

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