Okay, so polyurethane bushes could be seen as part of the ‘ Chassis Gear’ category, but what puts them in a league of their own is that, rather than dialling in that perfect geometry, they have more to do with keeping it that way over a long period of time. They also stiffen the chassis to keep these settings at optimum when you’re pushing your suspension to the limit.
Standard bushes are simply there as vibration isolators designed to dampen the energy transmitted through the join in two key components: this provides shockresistance to your backside and improves NVH (Noise Vibration Harshness).
Any sort of fruity fast-road driving doesn’t help matters, but the biggest killer of rubber bushes is time – they degrade, sag and, most importantly, change those alignment settings that you’ve worked so hard to achieve. Add that to the fact that they mostly sit on the comfort side of the fence to begin with, and it doesn’t do much for handling performance.
PU bushes use a synthetic polymer so they don’t degrade like rubber and will generally last 10 times longer. In real-world terms that’s beyond the life of the vehicle, and properly engineered items from the bigger manufacturers don’t make the car uncomfortable. They are a little more expensive than standard but you can’t lose.
SuperPro – www.superproeurope.com