WORKS White Paper: Spring Rates
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From: Infineon Raceway, CA
WORKS White Paper: Spring Rates
http://www.worksevo.com/Spring_Rates_1.pdf
The WORKS Engineering Staff has decided to share some resources with the rest of our EVO enthusiasts. This is intended to give everyone a sense of what takes place here on a daily basis as well as provide those interested with a learning experience. These papers are technical in nature and may (or may not) contain unfamiliar themes. (I know I had to read it more than once for it to click.) Please feel free to generate a discussion, ask questions, etc…
The WORKS Engineering Staff has decided to share some resources with the rest of our EVO enthusiasts. This is intended to give everyone a sense of what takes place here on a daily basis as well as provide those interested with a learning experience. These papers are technical in nature and may (or may not) contain unfamiliar themes. (I know I had to read it more than once for it to click.) Please feel free to generate a discussion, ask questions, etc…
Newbie
Joined: Oct 2004
Posts: 32
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From: Newport News, VA
Does changing your camber with camber plates change your motion ratio?
Unless I'm just way off in left field here; once you add negative camber with a camber plate you increase the value of D1 as the pivot point is above the measured line and decrease the value of D2 as you are effectively moving the contact patch given no turn angle.
If that is the case wouldn't you have to factor in your desired camber in selecting your spring rate? Then, if you alter your camber you would be limiting the effectivness of your springs. Would it even make that much of a difference?
I reserve the right to have misunderstood any and all parts of the paper.
Unless I'm just way off in left field here; once you add negative camber with a camber plate you increase the value of D1 as the pivot point is above the measured line and decrease the value of D2 as you are effectively moving the contact patch given no turn angle.
If that is the case wouldn't you have to factor in your desired camber in selecting your spring rate? Then, if you alter your camber you would be limiting the effectivness of your springs. Would it even make that much of a difference?
I reserve the right to have misunderstood any and all parts of the paper.
Newbie
Joined: Aug 2006
Posts: 3
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Technically, yes -- changing the camber would change the motion ratio, as it changes the length from the lower control arm pivot to the "extended strut line" like you've mentioned. However, the typical range of static camber adjustment is generally small, and so I wouldn't expect to see a drastic change in motion ratio as a result -- it would also depend on the length of the strut, etc. But keep in mind that the motion ratio is not constant to begin with and changes depending on the position of the wheel in its range of motion, which may or may not have more of an effect than static camber variation on the motion ratio. Also, camber variation and its effects on the tire contact patch is slightly more complicated than this paper alludes to. In fact, measuring motion ratio to the center of the wheel is an assumption in itself...Good point. But don't forget, one could always do the brute force method by measuring and recording spring displacement to wheel displacement...
