AmericanThunder
Super Moderator
I reckon most of us have heard of or used Polyurethane bushes, but why?
Put simply, they resist deformation better than rubber so are ideally suited to places where a joint needs flex but stiffer is better. Your anti-roll bar for example.
I've used poly bushings a lot over the years, I think they are great on most things, but personally I don't recomend them in control arms, as they don't allow the suspension to move as designed, affecting both spring rates and impacting the controlling effect of your shock. Of course being stiffer they also stop deflection affecting camber and castor too in high corner loads, so take your pick - street or race?
The Fiero runs poly everywhere, but only because rubber bushings are no longer available. My old TA ran them everywhere on suspension except control arms and that car handled superbly.
Anyway, here is the reason for this post. It's useful reading:
Polyurethane: How And Why It Provides Better Handling - Corvette Online
Put simply, they resist deformation better than rubber so are ideally suited to places where a joint needs flex but stiffer is better. Your anti-roll bar for example.
I've used poly bushings a lot over the years, I think they are great on most things, but personally I don't recomend them in control arms, as they don't allow the suspension to move as designed, affecting both spring rates and impacting the controlling effect of your shock. Of course being stiffer they also stop deflection affecting camber and castor too in high corner loads, so take your pick - street or race?
The Fiero runs poly everywhere, but only because rubber bushings are no longer available. My old TA ran them everywhere on suspension except control arms and that car handled superbly.
Anyway, here is the reason for this post. It's useful reading:
Polyurethane: How And Why It Provides Better Handling - Corvette Online
