[KTL]

I haven't had the opportunity to do a polybronze setup yet. But I have slugged it out with a Neatrix (rubber) set many times. And just so everybody's clear, the Neatrix refers to true rubber bushings. We're not talking about polygraphite or polyurethane or delrin plastic bushings here

At the front, I believe the biggest benefit in the polyB is the freedom of movement. The difference between the poly and the rubber is night and day. The polyB impersonate true bearings in that you can easily rotate a polyB-equipped suspension arm (as long as it's not connected to the shock absorber, torsion bar or sway bar). There is very little freedom of movement with the rubber bushings. The rubber bushings actually act like additional springs. The bushing housings are indexed on the A-arms such that they're in the best resting position for the car to be loaded on it's suspension. When you unload the suspension and try to move the A-arm (with no springs or shocks acting on it) the A-arm actually springs back. It does not move freely like a poly installation would.

Moving to the rear..... When the rear springplate is squished into the torsion tube and the outer bushing plate is installed, there's SUBSTANTIAL resistance to movement. The rubber bushings do not act like traditional bearings, which allow for sliding movement. The movement which occurs with Neatrix is twisting of rubber that requires a great amount of force to rotate the spring plate.

Anybody considering tracking their car for a number of years should strongly consider something other than OE rubber at the front. I had my OE bushes replaced with rubber and after 6 years, 15K miles, the loading of doing track days has caused the rubber to squish enough that one of my 22mm front torsion bars was starting to contact the front crossmember. The contact was very slight and only nicked the bar. Nonetheless, the front rubber being as thin as it is, is tested to it's limits to handle the heavy loading of stiffer torsion bars and R compound tires.

But Neatrix is good in the rear. After taking apart my rear suspension last week, the rubber is in good shape (only marginally deformed) and the superglue used to adhere the rubber to the spring plate tube did it's job. I'd recommend these in the rear for anyone who wants a no-maintenance, no-squeak rear install. Same goes for the front, just costs a little more. Neatrix/rubber is perfect for the street. No maintenance and good compliance to deal with impact harshness.