Torque Steer

Discussion in '80-Series Tech' started by Bat21, Jun 24, 2009.

  1. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    My newly acquired LC80 appears to have a 12" lift over a standard Curiser.

    Since owning it, it has had what appears to be torque steer where by you have to hold the steering slightly one way under power, and the other way during throttle off.... it seems worse on bumpier roads.

    I'm planning on replacing all the bushes with Super Poly Pro ones... is there anything else that might be causing this strange anomaly?
  2. Lka1988

    Lka1988 Wheeling in scale

    Messages:
    3,916
    Mine does the same thing, have yet to figure it out...

    Pics?
  3. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    If you manage to figure it out let me know... and likewise if I sort mine first.
    I need to sort some photos out, maybe tomorrow, here's one I have.

    [​IMG]
  4. retrofive

    retrofive SILVER Star

    Messages:
    9,343
    Location:
    so. oregon
    Welcome :flipoff2:

    Thats quite some lift. Please share up all the details :D
  5. blzrfn

    blzrfn

    Messages:
    262
    Location:
    Vancouver, WA
    Caster?
  6. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    It has these huge drop boxes fitted which I assume should correct the castor.

    All the mods were done before it left Japan, so I assume they will have been done correctly.

    [​IMG]
  7. blzrfn

    blzrfn

    Messages:
    262
    Location:
    Vancouver, WA
    In order to keep caster correct using drop brackets they must match the size of the lift. Those drop brackets only look like they dropped the arms about 3-4" so your caster is likely still very far off. Take it to an alignment shop and have them check the caster angle and you will have your answer.
  8. inkpot

    inkpot SILVER Star

    Messages:
    8,327
    Location:
    Chandler, Az.
    Howdy! With that much lift, you may have "bounce steer", due to the angle of the drag link. When the front end raises up, it pulls the steering to the left. When you hit the brakes it pushes the steering to the right. Am I close? Show us some pix of your front end steering bits. John
  9. Tapage

    Tapage Club 4X4 Panamá SILVER Star

    Messages:
    21,030
    Location:
    Panamá
    12" of lift .. :eek:

    By the pic suppose are around 4"-6" ( can you share your tire size ? )

    Go to an alignment shop and tell us how much caster you have right now .. if you wanna go factory specs are around 2.5° positive caster ..
  10. retrofive

    retrofive SILVER Star

    Messages:
    9,343
    Location:
    so. oregon
    x2, but :meh:

    Can you measure front and rear, hub to flare and post up for us :)
  11. IdahoDoug

    IdahoDoug

    Messages:
    8,782
    That doesn't look like a 12" lift, but I see your problem. Someone put the steering wheel on the wrong side......

    Heh.

    You need to know the alignment numbers before we/anyone can help you. I think it's fairly obvious the source of this is the lift itself and/or the change in geometry it caused.

    DougM

  12. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    Just measured them and they are, as you say, 3.5"

    That is exactly what I have got :eek:
    So how can I eliminate it, is it a case of getting the castor right :frown:
    [​IMG]

    Approximately 26" flare to hub front and rear
    [​IMG]
    [​IMG]

    Damn, I never noticed that :p

    Apologies for sounding a little dumb here guys... my excuse is I'm still recovering from this (link) a few weeks ago.
  13. landtank

    landtank SILVER Star

    Messages:
    17,177
    Location:
    Groveland MA
    well at 26" and only a 3.5" drop at the frame on the leading arm I'd guess your caster is at around -1*.

    That would make the truck a handful to control.
  14. retrofive

    retrofive SILVER Star

    Messages:
    9,343
    Location:
    so. oregon
    :eek::eek: Holy moly man! Glad your ok!. That is crazy.
  15. Grench

    Grench SILVER Star

    Messages:
    2,662
    Location:
    Omaha, NE
    Another thought...

    Are you sure the rear end isn't welded/locked too? That could result in some push-steering issues too.
  16. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    Thanks Retro... we're both getting there.

    Not sure what you mean by welded/locked but the 'steer' does appear to be coming from the rear.
  17. cruiserdan

    cruiserdan SupportingVendor Emeritus Moderator Supporting Vendor

    Messages:
    17,837
    Location:
    Sniffin' diesel
    We could indeed have bump-steer


    The first photo in post #12 may be a clue.

    The pandard rod and the drag link should be parallell. It looks as though yours are not. If they are not parallell they will travel in slightly different arcs resulting in unequal movement. I do not know if those are far enough off to be a problem but that could be at least part of it.


    You would need to move the frame-end of the panhard down or the axle-end of the panhard up to make them parallell.
    Last edited: Jun 25, 2009
  18. Bat21

    Bat21

    Messages:
    36
    Location:
    U.K.
    Thanks Dan, although it is dark here right now, I have just been outside with a torch and the panhard and drag link are parallel.... it's just the weird camera angle that makes it look like it isn't.
  19. cruiserdan

    cruiserdan SupportingVendor Emeritus Moderator Supporting Vendor

    Messages:
    17,837
    Location:
    Sniffin' diesel
    Well then that's not it......


    Hmm, I'll have to think about this.....
  20. Tapage

    Tapage Club 4X4 Panamá SILVER Star

    Messages:
    21,030
    Location:
    Panamá
    that's a coil spacer in front .. actually you don't need it ( or are you planing bigger tires ? ) pull out ( proobably have another in the back ) and your caster wil be much better ..

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