Wheel hop - Ford Mustang Forum
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post #1 of 2 (permalink) Old 10-14-2018 Thread Starter
99 rioredcobra's Avatar
Joined: Oct 2018
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Wheel hop

I bought a 99 cobra this spring and have been doing a little work and upgrades to it. Recently I swapped out the stock rims which had 245/45 all season tires on them for a set of 285/35 R18 summer tires on the back and 255/35 R18 on the front. I've read that the IRS cobras have had a bit of an issue with wheel hop I experienced it some with the slightly smaller tires all season tires but after putting the slightly bigger so sticker tires on it got way worse wondering what the best fix for the wheel hop is. New bushings for the back? New suspension? Any help would be appreciated just don't wanna spend money on something that won't work

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post #2 of 2 (permalink) Old 10-14-2018
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Upgraded control arms or conversion to a 4 link layout, and upgraded shocks. A good rotation resistance restraint system for the rear axle housing will help a great deal.

Even new OEM LC arms & bushings can help a lot.

Everything else being equal, the stickier the tire, the worse wheel hop will be.

Wheel hop is caused by the rear axle housing rotating opposite the tire rotation direction due to the car resisting forward motion, hitting hardware limits and rebounding. The axle rotation also nullifies a bit of the shock absorber functionality. Tire speed in relation to the pavement changes rapidly resulting in rapid oscillating loss and gain of traction. THEN the rebound of the actual tire gets involved and begins to bounce. Now, each tire bounce can amplify until things get simply knocked to pieces.

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