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Why would you turn the auto lsd off?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by tyson127, Apr 16, 2010.

  1. Apr 16, 2010 at 7:53 PM
    #1
    tyson127

    tyson127 [OP] Active Member

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    I honestly don't know. Given, I'm no mechanical genious. Just wondering.
     
  2. Apr 16, 2010 at 8:06 PM
    #2
    dexterdog

    dexterdog My pee parts itch

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    If you are stuck in snow the auto lsd will work against you because it will try to prevent wheel spin. Same thing would occur in other situations.
     
  3. Apr 16, 2010 at 8:24 PM
    #3
    tyson127

    tyson127 [OP] Active Member

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    So is it better to turn off the auto lsd in say, sand, mud, etc. with a 2x4?
     
  4. Apr 16, 2010 at 9:58 PM
    #4
    Isthatahemi

    Isthatahemi Well-Known Member

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    BFG AT's, Weathertechs, Hoppy's brake controller.
    Auto Lsd does not try to prevent wheelspin. It merely tries to distribute torque evenly between both wheels. So that both tires are pushing, instead of just one.
     
  5. Apr 16, 2010 at 11:06 PM
    #5
    Tillers_Rule

    Tillers_Rule ......................

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    Overheat the brakes?? LSD has nothing to do with the brakes:confused:
     
  6. Apr 16, 2010 at 11:10 PM
    #6
    Hootbro

    Hootbro Omnipotent

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    Someone can correct me if I am wrong but with the 2009 and up, they went to an all electronic setup that actually uses the brakes instead of a mechanical setup in the differential.
     
  7. Apr 16, 2010 at 11:18 PM
    #7
    PSJ

    PSJ Prerunners Work

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    Computer controlled brake and engine speed system to create " LSD performance or characteristics" if that makes sense with the 09's and up
     
  8. Apr 16, 2010 at 11:24 PM
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    Hootbro

    Hootbro Omnipotent

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    Make sense.

    Thanks,

    Hootbro
     
  9. Apr 16, 2010 at 11:46 PM
    #9
    Crom

    Crom Outside...

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    Think of Auto-LSD as a method to free yourself if you get stuck in 2WD.

    It's really not designed for continuous off road use.

    Exactly. If you wan to play around in the truck and do: dounts, burnouts, etc, then use VSC OFF mode.
     
  10. Apr 17, 2010 at 12:31 AM
    #10
    Crom

    Crom Outside...

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    I'm sorry Hemi, but that is not correct and I'm puzzled why you stated that considering your comments in similar threads. Auto-LSD does stop slipping wheels and thereby transfers torque to the opposite wheel on the same axle. You know this.

    [​IMG]
     
  11. Apr 17, 2010 at 7:49 AM
    #11
    dexterdog

    dexterdog My pee parts itch

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    But it does. Damn someone beat me to it.
     
  12. Apr 17, 2010 at 6:15 PM
    #12
    Isthatahemi

    Isthatahemi Well-Known Member

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    BFG AT's, Weathertechs, Hoppy's brake controller.
    It merely attempts to ensure the wheels are spinning at the same speed. If you mash it, it just makes both wheels receive torque. In the standard traction control on mode, there is throttle intervention. ALSD has no throttle intervention. If you are light on the throttle it will re-direct torque from the wheel that is spinning, to the opposite wheel. Whether it stops a wheel from spinning, is entirely dependent on if the other wheel has enough traction to put this torque down, without breaking loose. If your light on the throttle, it may have that effect, but so would TRAC. The single difference between ALSD and TRAC, is the fact that ALSD will not purposely stop wheelspin, it only serves to match wheel rpm on each axle.
    TRAC in 2WD attempts to stop all wheelspin.
    The OP was asking why would one shut it off, the only purpose I can think of is to lay rubber with 1 tire.
     
  13. Apr 17, 2010 at 6:37 PM
    #13
    kilgoja

    kilgoja Well-Known Member

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    :mudding:
    actually the auto lsd is off when you crank the truck up...if you press the button it turns it on and turns off the vsc i think
     
  14. Apr 18, 2010 at 12:26 PM
    #14
    David K

    David K Well-Known Member

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    Boy this is fun!

    AUTO LSD is a stronger limited slip than TRAC... In sand, I got both rear tires to kick up a rooster tail... because both rear tires had equal traction (or equal lack of traction). TRAC (in 2WD) regulates engine output to reduce wheel spin, AUTO LSD does not.

    IF one of the rear tires had traction and the other did not, then AUTO LSD would work like the diagram above, and channel torque to the traction tire by braking the spinning tire, faster than TRAC would... Think of AUTO LSD as a 'helper' to TRAC, and that is why you wouldn't leave it on, all the time.
     
  15. Apr 18, 2010 at 10:55 PM
    #15
    Crom

    Crom Outside...

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    Really?

    I think you may have a unique interpretation of how Auto-LSD works. Are you drawing you're conclusions from this Toyota quote?

    Although Toyota clarified how Auto-LSD detects a slipping drive wheel, it does not however say anything about distributing torque evenly or matching RPMs on the drive wheels like you're saying in previous posts. I think it's a stretch to say that. What it does say is that when rotational differences do occur it creates that Auto LSD effect. How does it do that? It brakes the slipping wheel.
     
  16. Apr 19, 2010 at 6:53 PM
    #16
    Isthatahemi

    Isthatahemi Well-Known Member

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    BFG AT's, Weathertechs, Hoppy's brake controller.
    It uses algorithms that evaluate the wheelspeed differently, and applies increasing brake pressure, until the wheels are turning within approximately 6 mph of each other. It attempts to match wheel rpm, the only variable it analyzes. Braking alone does not stop the torque from existing, but yes, some torque is dissipated in the form of heat from pad friction. In an open diff, torque takes the path of least resistance, if one tire is on ice, another on pavement, and the tire on ice is braked to the same speed as the wheel with traction, the torque is now split, not dissipated.
    ATRAC takes this a step further, where it can almost completely lock a spinning wheel, the path of least resistance is now the wheel with traction.

    Example. If the rear drive shaft is attempting to transmit 100 lb/ft of torque, through the diff/ tires etc. If there is not enough traction available at one wheel, it will allow the torque to be dissipated in the form of friction and heat through the ring and pinion, spider gears, and mostly through generating heat at the spinning tire. If the brake is applied on that one wheel, enough to generate 50 lb/ft of resistance, instead of the torque generating all heat and wasted motion, the wheel with traction will now transmit 50 lb/ft to the ground, allowing the vehicle to move.
    Auto Lsd does this with the only information that is analyzed for ALSD, wheel rpm, and it attempts to match wheel RPM, and this distributes torque somewhat evenly to both wheels, 50% in the form of brake pad friction / heat, and 50% in the form of motion.
     
  17. Apr 19, 2010 at 9:56 PM
    #17
    David K

    David K Well-Known Member

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    Hey Tyson127, are you taking notes... you will be tested on this! :lol:
     
  18. Apr 19, 2010 at 11:00 PM
    #18
    numbah57

    numbah57 GIVE THE MALL A BREAK...WHEEL THAT SHIT

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  19. Jul 27, 2014 at 2:27 PM
    #19
    weezer

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    just turn the vsc button off when driving in the snow or it will beep all the time. lol
     
  20. Jul 27, 2014 at 7:03 PM
    #20
    File IFR

    File IFR "... Intercepting The Localizer"

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    Your post failed. Please try again later. :D
     
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