7 replies to this topic

[Jordy869]

Hi. Any advice regarding poly bushes or nylon bushes for the rear subframe.

What’s best.

Regards

[absx2]

Rubber.

Car manufacturers have spent a few million on research and development to find that the likes of poly are a poor substitute for rubber.

If it was any good the manufacturers would use it as its much cheaper to produce.

[cal844]

I use Poly Bushes on the trunnions of the rear subframe purely for longevity as it doesn't move around too much.

Had a set on the car in my Avatar for 10 years with no issues

Edited by cal844, 14 December 2020 - 08:06 PM.

[Dusky]

Rubber.
Car manufacturers have spent a few million on research and development to find that the likes of poly are a poor substitute for rubber.
If it was any good the manufacturers would use it as its much cheaper to produce.

Well they do depending on the location of the bush.
They also cant use it everywhere due to NVH regulations.

[Maccmike8]

Poly all day pal.

[imack]

I used minispares poly bushes on my rear subframe, partly because I thought the current rubber bushes were likely to disintegrate within the first 12 months and I didn't fancy the hassle of replacing them again.

[Steve220]

Full poly and you'll get 'drumming' through the boot floor. The front bushes on my rear subframe are poly, rears are rubber. I get the stifness I want, and a compromise on road noise. There is no noticeable difference in my set up to full poly. However there IS coming from full rubber.

[weef]

Polyurethane and nylon have different qualities.

Nylon is a strong, stiff engineering plastic often used to replace metal bearings and bushing. Because of this property it would possibly give a very harsh ride offering little to no flexibility.

Polyurethane on the other hand give the flexibility needed. Some manufacturers have differing grades of "stiffness" giving the user a choice of what is required to suit the intended  application.

Then there is the rubber option fitted as standard by the manufacturers. Manufacturers use rubber to give enhanced ride comfort over the plastic options.

"Plastic" material options will give a harsher ride and can tend to squeak if not greased on assembly, but will be longer lived than rubber.

It is a compromise of ride quality, lifespan, feel, performance, squeaking, servicing and installation. If you continually drive" like you have stolen the car" then go for the plastic alternatives to get the benefits that they offer over rubber but if not rubber may well be better.

If you do fit  "plastic" do not mix and match with rubber.