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Thread: more aggressive downshift!? for turbo brake efficiency!!!

  1. #1
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    Default more aggressive downshift!? for turbo brake efficiency!!!

    hi all! it's my first post here!

    i have build a tune with exhaust brake and it's working fine but i have to downshift in manual mode! so i headed to my tcm and i put more aggressive number at downshift at 0%tps but it's almost doing nothing! i have read that we do not actually have access to full downshift table that why my downshift are slow! anyone know a way to have more aggressive down shift? or when are we gonna have access to those timing table?

    thank you!

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    forget it i got it working! :P my mistake :P

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    Same trouble but this time I can't figure it out! On lly 5 speed Allison the truck don't want to downshift a 0% throttle I even try at 6%! On my Lbz 6speed it worked fine but I can't get It working on my friend truck? Any tips??? :a

  4. #4
    Lifetime Member killerbee's Avatar
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    Quote Originally Posted by bob_22r View Post
    Same trouble but this time I can't figure it out! On lly 5 speed Allison the truck don't want to downshift a 0% throttle I even try at 6%! On my Lbz 6speed it worked fine but I can't get It working on my friend truck? Any tips??? :a
    Be sure that the corresponding upshift value is HIGHER than the downshift value. It will help to see the conflicts if you put both the upshift and downshift values on the same excel chart. The 2 lines should not cross anywhere.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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    Yes that was my first mistake! But this time I set everything like in my working Lbz calibration but it just don't change a thing shift point stay the same! :/ I could send you the file if you wanna look!?

  6. #6
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    I am seeing the same thing with my 5speed
    04 LLY Crew cab
    Complete LBZ intake
    EGR is gone
    PCV delete
    resonator delete
    EFI Live DSP5

  7. #7
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    I have the opposit with my 6sp out of a 06 4 to 3closed throttle down shift is very harsh the rest are fine.

    Dale

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    I found out what was causing my 4 to 3 closed throttle down shift Killerbee thanks for info about up and down shifts linesnot crossing.that was my problem.Now closed downshifting is good.

    Dale

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