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  1. #1
    Join Date
    Dec 2007
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    PITTSBURGH
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    98

    Default Front Roll Center

    If a car does not respond well to common adjustments, can moving the front roll center be an "at the track" adjustment for tight or loose handling? Specifically, raising or lowering the RF upper control arm on the frame to relocate the RF instant center?

    I understand body roll will react as well.

  2. #2
    Join Date
    May 2007
    Location
    Kansas
    Posts
    1,502

    Default

    Quote Originally Posted by musolino21 View Post
    If a car does not respond well to common adjustments, can moving the front roll center be an "at the track" adjustment for tight or loose handling? Specifically, raising or lowering the RF upper control arm on the frame to relocate the RF instant center?

    I understand body roll will react as well.
    Do you mean any changes don't really seem to effect the car? Or just not in a positive way?

    Control arm adjustment:

    For sure not a common adjustment. IMO that is more a track to track deal then a typical thru the night adjustment.

  3. #3
    Join Date
    Dec 2007
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    PITTSBURGH
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    Default

    Hi Billet, I hope all is well. And correct... If nothing is binding and the car, just say, has a tight condition and doesn't respond to the adjustments. I was curious if adjusting roll center can help the car to turn.
    Last edited by musolino21; 09-27-2020 at 09:48 AM.

  4. #4
    Join Date
    May 2007
    Location
    Kansas
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    1,502

    Default

    Quote Originally Posted by musolino21 View Post
    Hi Billet, I hope all is well. And correct... If nothing is binding and the car, just say, has a tight condition and doesn't respond to the adjustments. I was curious if adjusting roll center can help the car to turn.
    Stop and think where the RF instant center is on a typical LM today? In the dynamic state and the limited range the RF operates in, the RF instant center is generally between the inner rod end of the lower arm and the RF lower shock mount. That being said how much are you moving the RF instant center if you move the upper arm 1" either way? it's not going to be much different as far as the actual roll center.

    What I'm pointing out is the roll center isn't what is going to make the difference, it's the camber gain and if the RF needs more or less camber to maintain maximum traction. Then on a side note, if the camber isn't correct and the tire doesn't have max traction: Why would you want to change it back and forth? I would keep it at max traction and adjust the back of the car to adjust the car thru the night.

    I hope that makes sense.

    To explain or go into more detail about your issue or what else it could be, I would need a ton more info on the issue you have. But to be honest if the car doesn't seem to respond to changes. there is another issue somewhere? Check the car out for cracks in the tubing, I would think the frame is flexing a ton for some reason and thus changes are hardly noticeable.

    I think you probably still have my number

  5. #5
    Join Date
    Dec 2007
    Location
    PITTSBURGH
    Posts
    98

    Default

    I appreciate it, yes I do have your number. Thank you.

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