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A-TRAC/TRAC/AUTO LSD Explained (Easy to understand, I hope!)

Discussion in 'Technical Chat' started by David K, Jan 19, 2010.

  1. Jan 3, 2014 at 10:44 PM
    #1361
    Passion4Outdoors

    Passion4Outdoors Active Member

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    I just wanted to post this quick reference card (as an attachment) that I made to keep track of all of my truck's traction options. If you print it on card stock, cut it out, and laminate it, it will fit perfectly in the little pouch on the driver's side sun visor. It begins by listing three options for L4 driving. The first one adds back some automation, while the other two deal with locking the differential and Downhill Assist Control. The remaining four options are the different modes for the VSC OFF switch. I used the info from the owners's manual to create this and keep it handy for when I am in a bind and need answers regarding the truck's capability. I hope that it may help others with the TRD Off Road package and automatic transmissions in experimenting with the options without holding a book in their hands.

    I welcome any comments and/or editing suggestions.

    See my full build here:
    http://www.tacomaworld.com/forum/new-members/308438-new-colorado-tacoma-owner.html
     

    Attached Files:

  2. Jan 4, 2014 at 4:38 AM
    #1362
    clcoyle

    clcoyle Well-Known Member

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    That is awesome. Thanks for sharing.
     
  3. Jan 4, 2014 at 4:45 AM
    #1363
    Jadpitt27

    Jadpitt27 Active Member

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    I agree with this. One thing I noticed when in 4H and push the button for TRAC-OFF mode, its only good for <30mph. Once you go over 30mph TRAC-OFF light turns off. And it will stay this way until you push the button again. Even when slowing below 30mph it will not automatically re-enable. You must push the button again.
     
  4. Jan 13, 2014 at 1:07 AM
    #1364
    David K

    David K [OP] Well-Known Member

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  5. Jan 24, 2014 at 6:51 AM
    #1365
    cw50must

    cw50must Member

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    Icon Stage 2 Setup
    Thanks for the informative thread, this is exactly what I was looking for.
     
  6. Jan 30, 2014 at 10:12 AM
    #1366
    David K

    David K [OP] Well-Known Member

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    Happy to help!
     
  7. Feb 16, 2014 at 7:06 PM
    #1367
    mistaare

    mistaare Well-Known Member

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    Just curious, what are your experiences with the YWM in snow? I did the YWM yesterday and took it out to try in the snow. Four different times I tried starting in VERY limited traction situations and it did NOT get me out. Two times in 8-10" all 4 just dug myself deeper, then had to shovel my way out. Then twice on hard snow packed/icy hills. I would stop in the middle of the hill try to start from a stop. I would either just sit and spin or wheels would spin while I would slide backwards.

    I am pretty sure that I did the YWM correctly. When I was stuck in deep snow, the 4Lo light would blink, and I would watch the left rear tire spin, then stop and I could hear the right rear spin and it would go back and forth.

    Now, I am assuming my BFG AT's with 4/32's tread left didn't help the situation. I am long overdue for new tires. But that is a subject for another thread. :)

    So, two questions:
    1. What are your experiences in snow, either deep or hard packed?
    2. I am assuming I did it correct (I have limited mechanical experience)? Since in 4lo I saw the tire spin alternating from side to side. In the past, while I was in 4lo the tires would just spin.

    Just for the record. Disconnected battery. Pulled out first white clip of wires. I cut the second yellow wire (with the thin black line), and installed a switch that I attached to the inside of the glove box. My truck is 5+ years old and paid off so I am not worried about dealer and warranty. When I switch it off, the 4lo goes solid and tire just spins.

    Just letting you know. I posted these questions in a few threads, not sure where I would get answers. :p
     
  8. Feb 17, 2014 at 9:19 AM
    #1368
    David K

    David K [OP] Well-Known Member

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    If you are asking me, I can't help since I have an Off Road TRD and A-TRAC.

    L4 is normally open diffs, and that means one tire in front and one tire in the rear will spin freely once they are on a traction-less surface. A-TRAC and lockers matches tire rotation across the axles so all tires rotate equally.

    Doing the yellow wire (4 Lo Trac) mod provides traction control in L4 to allow power to transfer to tires that have traction and not just to those without traction.

    In deep snow (keep in mind where I live, there isn't any but I have driven to it), I have found that the rear locker + A-TRAC made driving a breeze off road. With the rear locked, the A-TRAC only works the front tires and then only when you drop to less than 3 mph... so only if you are nearly stuck... then it comes on and keeps you going!
     
  9. Feb 17, 2014 at 9:42 AM
    #1369
    mistaare

    mistaare Well-Known Member

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    I bought the new over 5 years ago and I NEVER thought I would use it like I do. I absolutely love the truck, and regret not getting an off road.

    When I get my next truck (in about 4 years) I know EXACTLY what to look for.
     
  10. Feb 17, 2014 at 5:53 PM
    #1370
    David K

    David K [OP] Well-Known Member

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    :mudding:

    :D
     
  11. Feb 18, 2014 at 8:22 AM
    #1371
    Ducs2r

    Ducs2r Active Member

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    I used exactly that combo to get up a steep hill in deep snow this weekend after high centering and getting stuck. Worked like a charm.

    By the way, I re-read this post a few weeks ago and finally understand what you gain from hitting the auto LSD button. It is great when starting on a little snow or ice where you really don't need or want to kick it into 4wd. We have had tons of snow in the east this year and I have really appreciated the Off Road TRD package.

    T
     
  12. Feb 24, 2014 at 5:44 PM
    #1372
    David K

    David K [OP] Well-Known Member

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    Sounds like you got it...

    2WD: To improve traction, use AUTO LSD
    4WD-LO: " , use A-TRAC
     
  13. Mar 12, 2014 at 11:58 AM
    #1373
    Nix

    Nix Member

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    Great post but still a little confused. I own a 2014 TRD Sport 4x4. I only have the VSC off button (the truck with curvy lines). All I want to know is what to use for the following scenarios:

    1. Driving on a snowy/icy road.

    2. Getting stuck in the snow.

    That's really the only reason why I have a truck. Thanks in advanced for your help.
     
  14. Mar 12, 2014 at 12:12 PM
    #1374
    MudFlap

    MudFlap Well-Known Member

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    The short answers....

    1. 4H

    2. 4H (plus generous amount of skinny pedal)



    The VSC button is MOSTLY useless with 4x4 models. When in 2H one quick push of the button will give you a little bit stronger LSD effect, and if you are lacking THAT much traction you may as well go into 4H. There may be times when you will need to hold the button in and disable everything to get wheel spin up in 4H but when you do you will lose TRAC.
     
  15. Mar 12, 2014 at 12:26 PM
    #1375
    rbishopp

    rbishopp Well-Known Member

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    So far I've added an Advance folding bed cover and since removed it. Gave it to my son in Maine, he has an 05 2wd. GT perfect fit seat covers. Weathertech floor mats and window vent visors. Waag center brush/grill guard. Hose clamp tailgate mod. Turned off the seat belt chime. Added Ultra-Gauge. Trailer hitch. Softopper. Replaced sun visors with slide out style. Toyota bed extender. Had Firestone Destinations and now Michelin LTX AT2 in stock size. More mods to come; Fog lights, locking storage in bed, intermittent wipers. Now looking for Radio/HU upgrade. and maybe a lift way down the road.
    I think I have the same set up on my 09. 4x4 with the button to shut off VSC. Typically I do not use it. If I start to slip/spin I back off the gas a bit and it bites again. Or I go into 4H and just just drive. I've played around it with a bit and found I can just ignore that it is there and drive like I would any pick up.
     
  16. Mar 13, 2014 at 11:52 PM
    #1376
    David K

    David K [OP] Well-Known Member

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    In 2012, they changed H4 so that the standard mode has engine regulated TRAC. I would suggest a quick push of the VSC button to activate TRAC-OFF so you will have stronger TRAC without the regulation (just like you do for 2WD to have more TRAC).
    Before 2012, the standard TRAC in H4 was unregulated... no quick button push.
     
  17. Mar 13, 2014 at 11:54 PM
    #1377
    David K

    David K [OP] Well-Known Member

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    2009-2011 Tacomas have 2 H4 modes: H4 (TRAC without regulation) and H4 (VSC OFF/ no traction control)
     
  18. Mar 13, 2014 at 11:59 PM
    #1378
    David K

    David K [OP] Well-Known Member

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    Correct, only the OFF ROAD TRD 4WD has more traction choices (Rear Locking Differential and A-TRAC).

    1. H4, quick press of button (TRAC OFF), unless you are talking thin snow for safety, then the normal H4 no button press.

    2. L4 for more torque/ power (no traction control so tires will spin). Turn your tires left and right to grab fresh bites.
     
  19. Mar 14, 2014 at 2:20 AM
    #1379
    MudFlap

    MudFlap Well-Known Member

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    I think I'm gonna go tie myself off to a big ass tree and set up a couple of cameras to record how the wheels pull in the different drive modes. Just for illustration purposes. :D
     
  20. Mar 15, 2014 at 10:57 AM
    #1380
    David K

    David K [OP] Well-Known Member

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    SWEET! :cool:

    I took photos of how the tires dug or didn't dig into the sand in the different modes...
     
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