How exactly do these help improve performance?

 

they are harder and give less. they donot alow for asmutch flex as regular rubber. they will make everything feel tighter.

-Stell


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1988 Pontiac Trans Am. 305 TPI Mods=MSD 6A+Coil+Wires, K & N, SLP AirFoil,180 Thermostat, Cold Air, Hooker Aerochamber Catback

1974 Dodge Charger , Currently restoring but has a 318 with Crane Cam, Carter AFB 4BBl Carb sitting on a Weiand Stealth Intake

RIP 1988 IROC-Z

 

The poly doesn't deflect like the stock rubber , so it acts like more of a solid pivot point,less likely to twist around.
This allows the suspension to move at the points it was designed to pivot at, instead of just compressing (or binding) in rubber.
The Delrin and aluminum bushings I'm using are even less likely to deflect or bind than the poly, but they are a little noisier.
-Rich-

 

Let me ask what aspects of performance that you're trying to improve. Poly is a good choice in some applications (sway bar bracket bushings), OK in others (sway bar endlinks, one end only in LCA's), and generally a poor choice in some (both ends of LCA's).

Norm



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1979 Malibu w/some cornering tweaks and a few other interesting things

 

Poly bushings are supposed to last longer than rubber bushings. I've taken out end link bushings that were so brittle that pieces had already fallen off. Poly bushings aren't susceptible to deterioration from salt(air, road), oil, grease, etc(at least that's what I have read).

I've personally have had swaybar bushings, end links, and lower control arm bushings replaced with poly bushings, and I did notice an improvement in steering feel. The downside to poly bushings is that they tend to squeek if not lubricated. But for me, that is a small trade-off for the performance you gain.

 

How much would a set cost me? and just as important, how hard is it to install?