I felt like mine was acting similarly. I found myself trying lower psi in the rear tires, cutting the largest part out of the rear bumpstops, and removing the rear sway bar. Currently I'm reasonably happy with how it acts.
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Originally Posted by cueball89
2016 brz that is completely stock running factory 35psi tire pressures. I'm noticing over certain bumps/ heaves the rear end of the car becomes unstable. In a turn the rear end will start to slide and in a straight line it feels like the rear of the car is slamming down on the backside of the bump. I feel like there is too much rebound on the stock rear shocks or not enough rear spring rate? The front end seems ok over the bumps.
My gd wrx wagon with konis, sti springs and many poly bushings doesn't have this problem over the same bump. When the roads get rough with undgelating bumps the wrx is "glued" to the road and I can can carry speed and take corners with no issues. The brz seems to get "thrown" around a bit.
I've read a few threads talking about the same issue but no one was able to pin point what was causing the issue. I did read that aftermarket shocks fixed the issue, so I assume it's related to the shock valving?
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