Another trailing arm bushing question, Polly bronze durable? Options

[trojanhorsepower]

I relatively recently installed my new set of 914rubber bushings. These were purchased maybe 10 years ago and installed maybe 5 years ago, but since the car was apart they have almost no miles on them. After finally being able to drive the car I found this.

https://www.youtube.com/shorts/2DWFetQ51aE
https://www.youtube.com/shorts/H5XFSS_rh74

So clearly these don't fit properly. I was going to go with the Elephant racing kit, but a friend of mine installed poly bronze bushings on his Jeep and they did not last a year. Anyone have any experience with these bushings as to long term durability? Or should I just bite the bullet and go with the soft rubber original style?

Thanks,

Peter

[Superhawk996]

Just keep in mind none of the OEs use bronze bushings and that includes the likes of Ferrari, Porsche, Lambo, McLaren, etc. Cost is not why they use rubber bushings

[worn]

Just keep in mind none of the OEs use bronze bushings and that includes the likes of Ferrari, Porsche, Lambo, McLaren, etc. Cost is not why they use rubber bushings

Can you expand a bit about the actual down side of the bronze bushings from ER?

[Superhawk996]

Just keep in mind none of the OEs use bronze bushings and that includes the likes of Ferrari, Porsche, Lambo, McLaren, etc. Cost is not why they use rubber bushings

Can you expand a bit about the actual down side of the bronze bushings from ER?

There is a big degradation on the amount of road noise, tire noise, and impact noise (noise over bumps) transmitted into the cabin vs rubber bushings.

There is a significant increase in the spike loads input into the chassis - this reduces durability of the chassis pick up points like the suspension console. Rubber bushings absorb that spike loading.

With no rubber wind up from the bushing you lose some damping of the suspension as it travels over small bumps and road input - this makes the dampers work harder to control the wheel motion.

The maintenance aspects and misalignment aspects were mentioned above by others.

The need for ongoing maintenance, chassis loads, durability, and poor NVH are the main reasons OE’s won’t touch something like poly bronze bushings.

They have advantages on track / race cars but there maintenance, and frequent replacement are part of the game.