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Thread: BIG bump steer issues on my Capri 😞

  1. #1
    boXXer
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    BIG bump steer issues on my Capri 😞

    Hi guys. I’m having bad bump steer problems ok my Capri, mostly when the shocks are on soft for road, so I’m assuming it’s that?

    could you guys take a look at these pics and see what you think?

    the TCA is almost horizontal at normal ride height, and I have spaced the track rod ends down to run almost parallel with the tca.

    When driving along and hitting a bump in the road and blowing through the travel (like 2” probably) it wants to pull the steering wheel out of your hands

    It’s a standard crossmember and standard holes etc.

    Thanks
    Last edited by boXXer; 17-06-2019 at 20:07.

  2. #2
    boXXer
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    BIG bump steer issues on my Capri 😞




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    Re: BIG bump steer issues on my Capri 😞

    imho spaced down steering joint is whats causing it, steering and tca may be parallel, but when you take the location of the outer tca ball joint into account, parallel is wrong, id say you need to move the rack down, or move the steering rose joint up

  4. #4
    boXXer
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    BIG bump steer issues on my Capri 😞

    So you reckon I’ve spaced it down too much? Someone on my Facebook has mentioned steering arms could be the wrong way around?


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  5. #5
    boXXer
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    BIG bump steer issues on my Capri 😞

    Yup, terry spotted it




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    Re: BIG bump steer issues on my Capri 😞

    if swapping them over moves the steering rose joint up then that should make it better

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    Re: BIG bump steer issues on my Capri 😞

    What wheel offset are those, looks like a geo issue but looking at your where your disc sits in relation to the wheel it looks as though you have a big neg wheel offset which can cause a lot of wander too

  8. #8
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Erikmex View Post
    What wheel offset are those, looks like a geo issue but looking at your where your disc sits in relation to the wheel it looks as though you have a big neg wheel offset which can cause a lot of wander too
    Yeah someone else said that. They are -13 15x9


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    Re: BIG bump steer issues on my Capri 😞

    A few years back i had -7 8x15's on my Mk2, had a similar issue that felt like bump steer but with very small susepnsion movements, ie. when hitting small road changes, white lines etc, it was down to too much neg wheel offset, try a little toe in and see what happens.

  10. #10
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Erikmex View Post
    A few years back i had -7 8x15's on my Mk2, had a similar issue that felt like bump steer but with very small susepnsion movements, ie. when hitting small road changes, white lines etc, it was down to too much neg wheel offset, try a little toe in and see what happens.
    I really don’t think it’s that. I kinda know what that feels like. Your talking about tramlining, which mine does too 🙄 but, this is deffo bump steer. As it does it as you blow through the travel not really over slight bumps etc.


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    Re: BIG bump steer issues on my Capri 😞

    It was quite severe on my car, not like tramlining when running really low profile tyres. Why not jack the car through it’s suspension travel and measure the bump steer? In my experience really deep negative offset wheels are terrible for steering, a quick toe change would rule that out
    Last edited by Erikmex; 18-06-2019 at 12:05.

  12. #12
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Erikmex View Post
    It was quite severe on my car, not like tramlining when running really low profile tyres. Why not jack the car through it’s suspension travel and measure the bump steer?
    Yeah that’s next on my list after I’ve changed the steering arms over 🙄


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    Re: BIG bump steer issues on my Capri 😞

    Is there a particular reason why you should use tyre width not suited to the rim?? Looking at the pic the tyre wall is well pulled away from the rim.

  14. #14
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Colr6 View Post
    Is there a particular reason why you should use tyre width not suited to the rim?? Looking at the pic the tyre wall is well pulled away from the rim.
    Because I’m cool


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    Re: BIG bump steer issues on my Capri 😞

    Dont you know, its the stretched look, goes with -50 Neg camber

  16. #16
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Erikmex View Post
    Dont you know, its the stretched look, goes with -50 Neg camber
    Exactly that


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    Re: BIG bump steer issues on my Capri 😞

    Quote Originally Posted by boXXer View Post
    Because I’m cool


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    Bump steer shouldn’t pose any problems then.....lol

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  19. #18
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Colr6 View Post
    Bump steer shouldn’t pose any problems then.....lol
    Oh nah, I’m not THAT cool.


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    Re: BIG bump steer issues on my Capri 😞

    The job can easily be cured with all correct parts & angles fitted to the car.

    If you prefer stretched tyres on rims (bead leaks likely to happen) & fitting big spacers,big camber etc then forget driving on damp roads anthing more than Miss Daisey would drive like.
    Cool is for the kidz
    Correct angles is for the men.

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    Re: BIG bump steer issues on my Capri 😞

    I bet you're fun at parties!

  23. #21
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Erikmex View Post
    I bet you're fun at parties!
    😂😂😂




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  24. #22
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by piekey View Post
    The job can easily be cured with all correct parts & angles fitted to the car.

    If you prefer stretched tyres on rims (bead leaks likely to happen) & fitting big spacers,big camber etc then forget driving on damp roads anthing more than Miss Daisey would drive like.
    Cool is for the kidz
    Correct angles is for the men.
    You’d deffo hate my Capri then. It’s right chavved up.


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    Re: BIG bump steer issues on my Capri 😞

    Small point - Miss Daisy didnt drive, she was driven, just saying.

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    Re: BIG bump steer issues on my Capri 😞

    Haha chavved up quality.


    '68 1100 Deluxe-bog stock soon to be a twincam rep.


  28. #25
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by meXEco View Post
    Haha chavved up quality.
    😂 rude boi


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    Re: BIG bump steer issues on my Capri 😞

    Quote Originally Posted by boXXer View Post
    ������




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    and pikeys set up will be the fastest

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    Re: BIG bump steer issues on my Capri 😞

    Any other pics of Capri

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    Re: BIG bump steer issues on my Capri 😞

    Too much offset, stretched tyres and too much chamber might be classed as "cool" and for straight line, slow cruising ok but if you want to cure your problem there lies your answer.

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    Re: BIG bump steer issues on my Capri 😞

    Thats what i said - see above, but he knows that the issue is bump steer, only way is to jack and measure bump steer

  33. #30
    boXXer
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    BIG bump steer issues on my Capri 😞

    Bump on this. Tried my normal track wheels (15x8 et0) with wider tyres and it does exactly the same thing. Here’s some pics of what it looks like underneath.

    My settings are:
    1mm toe out
    3 deg neg camber
    Not sure on castor, need to get some turn table to measure it.

    It does it a lot more if the shocks are set to soft and it’s blowing through the travel, but my arms don’t look massively out of alignment do they?


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  34. #31
    boXXer
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    BIG bump steer issues on my Capri 😞

    Someone above asked for some more pics of it?


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    Last edited by boXXer; 02-10-2019 at 20:50.

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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by boXXer View Post
    Bump on this. Tried my normal track wheels (15x8 et0) with wider tyres and it does exactly the same thing. Here’s some pics of what it looks like underneath.

    My settings are:
    1mm toe out
    3 deg neg camber
    Not sure on castor, need to get some turn table to measure it.

    It does it a lot more if the shocks are set to soft and it’s blowing through the travel, but my arms don’t look massively out of alignment do they?


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    If you have bump steer changing the wheel won’t fix it, although stiffer damping might help reduce its effect. Looking at that pic the whole rack is too high and the steering rod end wants spacing down more.


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  36. #33
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Graham View Post
    If you have bump steer changing the wheel won’t fix it, although stiffer damping might help reduce its effect. Looking at that pic the whole rack is too high and the steering rod end wants spacing down more.


    Sent from my iPhone using Tapatalk
    Thanks graham. I CBA with lowering the rack so might just have to put up with it 😂

    Never had any of this with my old shitbox mk2 🥴


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    Re: BIG bump steer issues on my Capri 😞

    ET-13 wheels give a big scrub radius together with toe-out means you need to hang on to the steering wheel.

  38. #35
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Miniliteman View Post
    ET-13 wheels give a big scrub radius together with toe-out means you need to hang on to the steering wheel.
    So what would you suggest running in terms of toe? And also run et0 wheels?

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    Re: BIG bump steer issues on my Capri 😞

    Wrong position of the com struts brackets.

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  41. #37
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by Escort TC View Post
    Wrong position of the com struts brackets.
    Really?

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    BIG bump steer issues on my Capri 😞

    U want 1-2 mm toe in with Rwd
    And pivot points on arms and rack need be same distance apart


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    Re: BIG bump steer issues on my Capri 😞

    Quote Originally Posted by boXXer View Post
    Someone above asked for some more pics of it?


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    Dunno about anyone else but I see no photo's - just image icon's! I'm reading / viewing this on a PC.

  44. #40
    boXXer
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    BIG bump steer issues on my Capri 😞

    Quote Originally Posted by katana View Post
    Dunno about anyone else but I see no photo's - just image icon's! I'm reading / viewing this on a PC.
    Seems to work on Tapatalk but not the web based one. Your not too far from me. I live in chobham.
    Last edited by boXXer; 03-10-2019 at 10:00.

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