Delrin/Aluminum front control arm bushings installed!

TopElement

Yes, I have replacement bushings for those 3 locations too. My car is a Nismo model, but the front damper lower bushing is lekly the same size.
Lower control arm bushings definitely make a difference to suspension feel and response, with a slight increase in road noise.

Delrin/aluminum was chosen as IMO it's the best solution for rubber replacements for single axis movement. Wherever polyurethane works, Delrin is better in terms of performance. Polyurethane is good for mounts, but not moving parts since it sticks-slips-sticks-slips (stiction). This is not very smooth, often causes noise, and is still compliant similar to stock rubber.

Spherical bearings have a slight advantage over Delrin with metal sleeves as far as precision and smoothness. They do require a little more maintenance (cleaning, lubing), transmit more noise, and require replacement when they wear.Converting stock suspension parts to use spherical bearings is also more labor intensive and expensive. Since bearings come in set sizes that likely don't match the bore where an OEM rubber bushing was, it requires adapter sleeves and then requires spacers on each side to center it on the mounting pin/bolt. With Delrin parts, the actual bushing is machined exactly to the size needed and reduces part count and price.

I'll work on getting pictures of all the upgraded suspension parts on my Z. There doesn't seem to be much interest in these type of real performance upgrades for these cars, so not sure if a large run of production parts will be made.

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-'11 Gun Metallic Nismo 370z
-'12 WRB STi hatch
-'99 2.5RS coupe

Rusty

I'm interested!

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jujubii

thanks for the clarification, i;m extremely interested
I just need to do more research on where there exist only single axis movement (replace that with delrin) and where there is more (replace that with spherical - SPL is supposedly going to release a whole set soon). though more compliant than poly, i read that delrin still restricts multiple axis rotation to some extent.
if you have any input on which mounts or moving parts move where, i would love to hear it. especially on the front lower arms and anywhere in the rear. im waiting on the spl front arms to come out so i dont have to worrk about the front upper.

TopElement

Well to be specific, there are some places where multi-axis movement is happening but it shouldn't be for performance. The A arms these bushings go into are a good example. The only axis of movement should be up and down, but the stock rubber bushings allow front-back and in-out movement as well for "ride comfort".

As for compliance the order would be: rubber, poly, delrin or bronze, and ultimately metal-metal bearings. Delrin does not restrict rotation, it allows parts to rotate smoothly when shapes and tolerances are properly engineered.
Poly only allows parts to rotate when it doesn't fit very tight and grease is used.

I guess a comlex diagram would have to be made to show where parts move in a single axis, in multiple axis, and where bushings are being used to simply hold a component in place.

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-'11 Gun Metallic Nismo 370z
-'12 WRB STi hatch
-'99 2.5RS coupe

binary0x01

Got anything like this for the 370Z? I'm interested in getting em.

Whiteline Rear Sub Frame Bushing Kit

They seem to be only for the 350Z :/

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Tune (by Seb@SpecialtyZ) -- Upgraded Parts List : When in doubt, use brute force; if it doesn't work, you aren't using enough.

fuct