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Auto LSD

Discussion in '2nd Gen. Tacomas' started by Thelt, Sep 26, 2012.

  1. Oct 3, 2012 at 12:07 PM
    #81
    MudFlap

    MudFlap Well-Known Member

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    Good stuff here! As far as I can tell everything you posted is correct. Unfortunatley it looks like we are supposed to have engine regulation in 4H with no buttons pushed. I too read the owners manual and what I got from it was when it refers to ALSD, it says it prevents the REAR wheels from spinning. It doesnt say anything about using it in 4WD. :notsure:
     
  2. Oct 3, 2012 at 12:13 PM
    #82
    shemp

    shemp Well-Known Member

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    Either that, or it was translated using google translate with voice dictation from being hollered across the 2TR-FE engine factory in Japan with machines running in the background.
     
  3. Oct 3, 2012 at 12:15 PM
    #83
    MudFlap

    MudFlap Well-Known Member

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    I think im gonna try somthin dumb. LOL

    Im gonna go find a slick muddy spot and see if I can tie myself off to a big ass tree to pull off of. I will try each mode and get sombody on the outside of the truck helping me watch how the wheels spin (ill get em to record this crazy chit too LOL). Like this I should be able to try each 2WD & 4WD mode out and have a video reference to prove it. We might even be able to make a sticky out of it, cause we damn sure have enough threads on it.
     
  4. Oct 3, 2012 at 12:17 PM
    #84
    MudFlap

    MudFlap Well-Known Member

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    This made me LOL.

    And you damn sure cant deny that youre country either. Cause only us folks down south use words like HOLLER. LOL
     
  5. Oct 3, 2012 at 12:21 PM
    #85
    shemp

    shemp Well-Known Member

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    I think they hire the same sumo wrestlers to write the manual as Yamaha hires to tighten crankcase drain bolts.
     
  6. Oct 3, 2012 at 12:22 PM
    #86
    shemp

    shemp Well-Known Member

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    ... I've spent a lot of time in south FL. :D
     
  7. Oct 3, 2012 at 1:08 PM
    #87
    DoorDing

    DoorDing Thank you, Nancy Roman

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    Make sure the shot is wide enough to get the entire tree in the frame. The money you win for the video may cover repairs. ;)

    The way I read it, all A-LSD references are for 2WD, and all TRAC references are specific to 4WD. There's a difference between TRAC and ATRAC, so depending on the truck, Toyota does have to make a confusing distinction. Since A-LSD is really just 2WD TRAC (or ATRAC), dropping all references to A-LSD would help clarify the nomenclature, IMO.

    Does the Tacoma come with a mechanical rear LSD? If not, that's even more reason to drop all references to LSD and stick with TRAC to name that functionality. Unrelated - this is another reason Toyota would do us a favor by dumping rear drum brakes, since disc brakes would seem to work better for TRAC.
     
  8. Oct 3, 2012 at 1:23 PM
    #88
    GP3

    GP3 Well-Known Member

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    We don't know that (hi-lighted above in bold). He never hit the button in 4wd High while pulling the car out of the ditch. He was in the default TRAC on & VSC on mode where throttle was regulated.

    He needs to do another test where he's in 4wd High, and presses the VSC button once so the TRAC Off light comes on. That's where we will see if there's any brake or throttle regulation. I'm going assume it's open diffs, with VSC on.
     
  9. Oct 3, 2012 at 2:13 PM
    #89
    MudFlap

    MudFlap Well-Known Member

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    I agree, I bet it IS open diff with VSC on.

    On a serious note, I think the best option for those of us with a 2012 OR is to do the locker mod. So we can lock the rear while in 4H, if we need any more traction than that, we can get 4L and use ATRAC and locker.
     
  10. Oct 4, 2012 at 5:15 AM
    #90
    shemp

    shemp Well-Known Member

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    VSC depends on engine regulation, it is therefore no different than ALSD + engine regulation. That's the default mode.

    The fact that there are different lights between tap and long-press in 4wd suggests that there is some actual difference between the two modes. VSC can't possibly be in effect for either mode, so the only remaining possible difference is that there is ALSD in one of them. Since long press is "fully off", it must mean that short press = ALSD.
     
  11. Oct 4, 2012 at 5:22 AM
    #91
    shemp

    shemp Well-Known Member

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    There are precisely two differences between TRAC and ATRAC:
    ATRAC has an electric/hydraulic brake booster,
    ATRAC operates in 4L.

    Quite frankly, they should eliminate the "TRAC"/"ATRAC" names, which are there strictly to add magic to the list of features and accomplish nothing but add confusion. Stick with ALSD all the way through.

    The different modes should be named like this;

    2H: VSC, ALSD, OPEN
    4H: VSC, ALSD, OPEN
    4L: OPEN, ALSD, OPEN+RLOCK, ALSD+RLOCK

    After all, those are, in effect, all of the actual modes available, just written in a way that is more consistent with standard nomenclature.
     
  12. Oct 4, 2012 at 5:27 AM
    #92
    DoorDing

    DoorDing Thank you, Nancy Roman

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    That seems fine to me, and it's a hell of a lot simpler to understand and utilize than the current official mess. A few controls tied to a small display that clearly showed the state of the systems would be a huge improvement.

    When I start using the OR capabilities of my truck, I'll keep your breakdown in mind. Thank you.
     
  13. Oct 4, 2012 at 7:26 AM
    #93
    GP3

    GP3 Well-Known Member

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    I understand what VSC is. We're talking about traction control (TRAC/ALSD/ATRAC). VSC is a whole different system and should be left out of the conversation for the time being. It only adds confusion. Your post is evidence of that.

    There is a simple difference between the two 4wd high modes (there's actually three, but I'll leave the third VSC Off one out): TRAC Off; TRAC On. The "TRAC Off" light indicates this.

    If "VSC can't possibly be in effect" why isn't the VSC OFF light on?

    If "ALSD is in one of them" why isn't the AutoLSD light on?

    VSC is not traction control, and does not change what traction control mode you are in. It is simply on or off (under 30 mph).
     
  14. Oct 4, 2012 at 7:33 AM
    #94
    Gearheadesw

    Gearheadesw Well-Known Member

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    On my '12 Sport, I can't turn off vsc (truck w. lines) and still have TRAC on in 4wd
     
  15. Oct 4, 2012 at 7:51 AM
    #95
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Even when VSC is off it isn't really off.:D
     
  16. Oct 4, 2012 at 8:00 AM
    #96
    DoorDing

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    That's the Toyota Way. :p

    Whip, is there proof that VSC Off still gives the VSC system some control? Over the years, I've read of stability systems that are never fully disengaged, no matter the driver settings. I can imagine that a relatively high CG vehicle like a 4WD Tacoma might always have at least a minor bit of VSC always lending a hand.
     
  17. Oct 4, 2012 at 8:07 AM
    #97
    GP3

    GP3 Well-Known Member

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    This is the only proof I've seen. It doesn't mention 4wd though.

    Untitled.png

    This one mentions 4wd.

    ToyotaDriveModes-1.jpg
     
  18. Oct 4, 2012 at 8:11 AM
    #98
    shemp

    shemp Well-Known Member

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    No, VSC is the exact same system.

    TRAC *is* ALSD *is* ATRAC. Effectively just different names for the same thing.

    Nobody cares what you want to CALL the modes, the IMPORTANT part is what they each DO.

    VSC (ALSD+engine regulation = default mode)
    ALSD (like VSC without engine regulation = tap button)
    OFF (open differential = hold button)

    Now you want to quibble about when the thing is making use of the sideways sensor, be my guest. It quite frankly does not apply to this discussion.

    Because its turned off, obviously.

    Because its turned off, obviously.

    VSC most definitely includes a traction control mode.
     
  19. Oct 4, 2012 at 8:12 AM
    #99
    DoorDing

    DoorDing Thank you, Nancy Roman

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    Thanks!

    The footnotes indicate that even disabled, VSC is waiting in the wings. That might be a problem on a performance car at the track, but at least on paper, I think that's a good approach for a 4WD truck.
     
  20. Oct 4, 2012 at 8:14 AM
    #100
    whippersnapper02

    whippersnapper02 Well-Known Member

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    The Toyota way for sure. Lexus is even worse with VSC. There are no buttons to turn it off until recently in the new ISF and LFA.

    There has been a time or two where I triggered it even though it was off. I could be wrong though. I try not to drive crazy offroad because I'm allergic to dying.:D Next time I'm somewhere with a lot of space I will try it.
     
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