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RSX Suspension Modeling Results

29519 Views 106 Replies 40 Participants Last post by  XDC5SX
I recently took a vehicle dynamics class. We needed to do a class project, so I (and two additional group members) chose to model the RSX suspension. I am attaching the final report so that everyone here can benefit from it. Note, I am posting this here in the autocross forum rather than the suspension forum because it is more relevant to those of us who track our cars or do autocross.

Basically, the car's suspension was measured so that the location of every suspension point was known in x, y, and z coordinates. Next, the suspension was modeled in Solidworks. From this point, lots of info can be measured/calculated.

Anywho, we looked at camber gain, both from suspension compression and from steering input. We also did roll center heights and bump steer. All of these were done for the front and rear. Additionally, aftermarket modifications were 'made' to the model and their effects on the above parameters analyzed. The modifications made were roll center adjusting ball joints, caster/camber plates that move the strut top inward 3/4" and rearward 3/4", raising the inner tie rod ends 1.25", and lowering the inboard side of the rear top link of the rear suspension 3/4".

DISCLAIMER: Every attempt was made to be as accurate as possible during this project. However, it is exceedingly difficult to measure the suspension perfectly. As such, I do not guarantee any values as being 100% exact. They should be pretty darn good though.


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Buddyclub RSD has lower tie rod end mounting points then factory to compensate for the lowered ride height. 6.3 degrees with RSD at stock height would not be the same as stock struts at stock height (essentially the 6.3 angle reading you got is less then what it is stock).
So with stock the toe in would be even less severe under compression?

And Mark, since you have the suspension out of the car and an extra RSD bracket, why don't you measure the height difference for us. :)
While on the topic of toe. When you did the toe plot against compression for the front, do you know if plates that added just positive caster (staight forward and back, not angled or horizontle) had an effect on the toe under compression? Or was it only when you messed with camber it had an effect.
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