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Thread: Adjusting castor to improve steering feel.

  1. #1
    Team Z8 Z8DinanS2's Avatar
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    Adjusting castor to improve steering feel.

    Years ago I discovered with manual steering Ferrari like the 512 TR and 328, that if caster was adjusted one direction the steering would get stiffer and more stable at high speed and the other direction steering would get lighter and more responsive albeit more sensitive at high speed.

    My one gripe with the Z8 is its steering is too stiff and lightening up the steering would make the car feel more playful. Has anyone played with their castor and if so their experience?

  2. #2
    Z8 Millennial Monster 2112's Avatar
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    Do you have the Dinan Castor plates installed?
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  3. #3
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by 2112 View Post
    Do you have the Dinan Castor plates installed?
    I don't think so. Do they dial in or dial out castor? Is there no castor adjustment in the suspension that can be set by an alignment shop? I thought all cars were adjustable for castor?

  4. #4
    Z8 Millennial Monster 2112's Avatar
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    I do not think it is adjustable with a Strut style front suspension. Hence the plates (which are still available). I think they give you .5 extra degrees of castor IIRC

    An earlier thread;

    Dinan Caster Plates (bmwz8.us)
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  5. #5
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by 2112 View Post
    I do not think it is adjustable with a Strut style front suspension. Hence the plates (which are still available). I think they give you .5 extra degrees of castor IIRC

    An earlier thread;

    Dinan Caster Plates (bmwz8.us)

    Seems the Dinan plates INCREASE positive castor which makes steering more difficult. More stable at high speed but more dull at moderate and low speeds. I think I want to try and go the other way. A more responsive feeling steering will make the Z8 feel smaller and more playful. ("The main downside to positive caster is that although it generally improves grip and high speed stability it requires more effort from the driver to turn the steering wheel.)

  6. #6
    Z8 Millennial Monster 2112's Avatar
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    Could the castor plates already be on your car as it was a full S2 example?
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  7. #7
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by 2112 View Post
    Could the castor plates already be on your car as it was a full S2 example?
    You are correct!!!!!!!!!

    They did in fact install the camber plates (~$600).

    Thank you!

    Now I should look to do a side by side comparison to see if it makes sense to remove my plates and bring back more steering feel....

  8. #8
    Z8 Ate My Homework! Norcal's Avatar
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    That sounds like a good idea. Steering will feel lighter, at the expense of a slight loss in ultimate front end grip. If you’re not driving at 8-10 10ths, it should be much better. But, the steering, even stock, is not “fast/light” compared with Porsche, for example.

  9. #9
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by Norcal View Post
    That sounds like a good idea. Steering will feel lighter, at the expense of a slight loss in ultimate front end grip. If you’re not driving at 8-10 10ths, it should be much better. But, the steering, even stock, is not “fast/light” compared with Porsche, for example.
    Exactly....that's why I was thinking of dialing in more negative camber. I am not worried about track performance which you only do so often. What I'm more concerned about is steering feel, which you feel every moment you're driving.

    Not sure what these plates look like, but if I reverse them will they go from adding positive camber to adding negative camber?

  10. #10
    Z8 Millennial Monster 2112's Avatar
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    I just Ordered a set, I will post pictures as soon as they arrive.

    I will guess if you rotate them by 33.3%, they become camber plates (+/-) rather than castor plates.
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  11. #11
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by 2112 View Post
    I just Ordered a set, I will post pictures as soon as they arrive.

    I will guess if you rotate them by 33.3%, they become camber plates (+/-) rather than castor plates.
    Thank you! That's what I'm thinking. I'll trade a little ultimate grip at the limit for better feel all the time.

  12. #12
    Team Z8 Z8DinanS2's Avatar
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    What Harry refers to as "inert" steering feel...that's what I want to dial out perhaps with a camber adjustment.

  13. #13
    Z8 Millennial Monster 2112's Avatar
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    Arrived today. You can see that they use rotation to change the angle of the strut assembly.
             
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  14. #14
    Z8 Millennial Monster 2112's Avatar
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    By the way, WARNING! If you are hoping to be pregnant in the state of California, do not ingest these castor plates.
    2000 Red over black
    heavily modified for performance. Although, not to the level of GM's car

  15. #15
    Team Z8 Z8DinanS2's Avatar
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    Quote Originally Posted by 2112 View Post
    By the way, WARNING! If you are hoping to be pregnant in the state of California, do not ingest these castor plates.
    Thank you for that warning! There I was thinking I might confuse it with a doughnut!

    So rotating 180 should increase negative camber.

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