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Thread: Dyno #'s

  1. #1
    Lifetime Member LBZoom's Avatar
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    Default Dyno #'s

    Any of you guys that have run an LBZ or any Dmax on the dyno...

    1.) what gear are you running in? I see 4th is a 1:1 ratio... I ran in second gear my first pull....

    2.) Should you "load" the dyno to reflect a higher load than the weight of the truck itself? I want to get the most accurate picture of when my peak torque is occuring...

    Thanks to anyone willing to share how they got their numbers, I've seen many people's trucks making a better TQ to HP ratio than my first run which had a 1.6:1 ratio of TQ to HP, I'm wanting to improve my tuning and I want to start by getting the most accurate #'s on the dyno.

    Thanks!
    Peace Through Torque

    Punisher Performance DSP5 Tuning, PPE Dual CP3's, 68mm Fleece Cheetah, Punisher Built trans w/ Suncoast Parts, Airdog 165, SoCal 100% Overs, ARP Studs

    2013 NHRDA Sportsman World Champion

    www.PunisherPerformance.com

  2. #2
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    4th gear would be the best if you have stock'ish tires
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  3. #3
    Lifetime Member LBZoom's Avatar
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    2nd gear if I'm running 285's? I figure that would be close....

    Do you run a load on your truck when you dyno?
    Peace Through Torque

    Punisher Performance DSP5 Tuning, PPE Dual CP3's, 68mm Fleece Cheetah, Punisher Built trans w/ Suncoast Parts, Airdog 165, SoCal 100% Overs, ARP Studs

    2013 NHRDA Sportsman World Champion

    www.PunisherPerformance.com

  4. #4
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    No, second gear is too low. I prefer to dyno in 5th, but some guys like 4th. I wouldn't go below 4th because you won't be able to load the motor enough.

  5. #5

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    I lock mine in 4th...
    2004.5 LLY Duramax, Compounds, EFILive, EvolvedMS.com 50" Trac Bars, DDP Injectors, PPE Pump, 4" turbo back exhaust, 6" Chrome Stack,
    ATS Trans w/ Triple Loc.




    Evolved M.S, LLC & SS Diesel Tuning

  6. #6
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    Quote Originally Posted by JoshH View Post
    No, second gear is too low. I prefer to dyno in 5th, but some guys like 4th. I wouldn't go below 4th because you won't be able to load the motor enough.
    Thats the biggest thing right there. If you don't load the engine you wont get an accurate numb
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  7. #7
    Lifetime Member LBZoom's Avatar
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    Sweet, that's the exact info I've been looking for. I know you guys have a lot more time on the dyno than me and I've been concerned that my numbers and graphs weren't accurate enough... I don't know if my horsepower will improve but my torque should show better I would think? I think I'll dyno in 4th, because it's a stock tranny and 4th is stronger than 5th probably if I remember right?

    I can't blame the guys at the dyno, they mostly run imports on the their dyno
    Peace Through Torque

    Punisher Performance DSP5 Tuning, PPE Dual CP3's, 68mm Fleece Cheetah, Punisher Built trans w/ Suncoast Parts, Airdog 165, SoCal 100% Overs, ARP Studs

    2013 NHRDA Sportsman World Champion

    www.PunisherPerformance.com

  8. #8
    Lifetime Member Boost's Avatar
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    I need help. A truck that should make 450 / 850 just had a horrible dyno session in 90% humidity and dynoed in random gears downshifting and pulling from 2200 rpm and up made 380 / 780. How can I lock it in 4th? Please give me advice on how to dyno properly. Thanks a lot!
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  9. #9
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    best advice make a dyno trans tune that will disable down-shifting from 4th to 3rd and disable up-shifting from 4th to 5th.
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  10. #10
    Lifetime Member Boost's Avatar
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    Once again, thanks a lot bb!
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

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