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SN95 Cobras
Rear Control Arm Question
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<blockquote data-quote="blacksheep-1" data-source="post: 12492821" data-attributes="member: 33936"><p>The issue with having too much stiffness in the upper arms is easily explained. While the mustang rear suspension actually works well for the drags, it tends to induce snap oversteer when the suspension attempts to "unload " (or unbind ) itself at the beginning of corner exit. If you look at the rear lower bars they are parallel and form identical arcs. The uppers also form identical arcs...in almost opposite directions. In other words, the top arms are constantly fighting each other,pulling in two different directions. The cheap, fast, dirty and not recommended way to fix this is to install a panhard bar and unhook one of the upper arms. The car will free up and you can actually tune the rear suspension. Someone used to make a kit that got rid of the two upper bars and melded them into one, with a panhard bar. Adding a panhard bar to this (stock suspension) disater will just add another arc to the already confused rear suspension, you can take a stock mustang, add a panhard bar and actually jack up one side of the car (the body) simply by twisting on the panhard bar. If it was me, on a road course, i'd find the softest upper control arm bushings that I could find. But truthfully, the only real answer is to go to a truck arm, some type of parallel 4 link of an IRS.</p></blockquote><p></p>
[QUOTE="blacksheep-1, post: 12492821, member: 33936"] The issue with having too much stiffness in the upper arms is easily explained. While the mustang rear suspension actually works well for the drags, it tends to induce snap oversteer when the suspension attempts to "unload " (or unbind ) itself at the beginning of corner exit. If you look at the rear lower bars they are parallel and form identical arcs. The uppers also form identical arcs...in almost opposite directions. In other words, the top arms are constantly fighting each other,pulling in two different directions. The cheap, fast, dirty and not recommended way to fix this is to install a panhard bar and unhook one of the upper arms. The car will free up and you can actually tune the rear suspension. Someone used to make a kit that got rid of the two upper bars and melded them into one, with a panhard bar. Adding a panhard bar to this (stock suspension) disater will just add another arc to the already confused rear suspension, you can take a stock mustang, add a panhard bar and actually jack up one side of the car (the body) simply by twisting on the panhard bar. If it was me, on a road course, i'd find the softest upper control arm bushings that I could find. But truthfully, the only real answer is to go to a truck arm, some type of parallel 4 link of an IRS. [/QUOTE]
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