Last year I purchased some used coilovers and the rear passenger side was noisy, it rumbled constantly and clunked on bumps. I have since replaced them for a new set, I was surprised to hear that the clunking is still there with the new coilovers, I have done a search on google and passenger side rears do tend to be noisy on various cars for some reason? What should I be checking for on my Z?

 

Thanks, Dan

I would be looking at the centre prop bearing if it was rumbling constantly, then look at the bushes on the rear arms and subframe for the clunking.

 

Another one of those, you have to be there or hear it for yourself type issues lol

I'd shoot for a work bushing. Possibly the shock absorber bushing in the lower part of the rear knuckle or any of the other several bushings in that area! I guess I wouldn't rule out HICAS joints too if you have them. As Graham says, knocks are hard to diagnose unless you can pinpoint them yourself.

Cheers guys, are these subframe and lower arm bushings readily available?

Cheers guys, are these subframe and lower arm bushings readily available?

 

Yes. Just be careful what you buy as the rear bushings are particularly sensitive to the ride quality. Poly bushing kits are readily available but are renown to make the ride harsh and unforgiving. That's great if you're after such qualities but not so if you want a nice comfy GT car ride.

 

For a smoother, friendlier overhaul, if it's your rear shock bushing, this can be replaced with a stock item with relatively little expense, if it's the other rear control arm bushings then you're looking at Nismo bushings as stock replacements are no longer available. Nismo bushings need to be sourced from Japan or some US sellers still have stock, but be prepared for a fairly large bill!

 

Note that for all of these bushings to be replaced they will need to be pressed out and pressed in unless you use the "harsher" poly bushes.

Cheers guys, are these subframe and lower arm bushings readily available?

 

If the subframe is clunking, I wouldn't waste your time and money replacing the bushes, you can buy subframe locking collars fairly cheap and are quick and easy to install. Reportedly, this action has no (or very little) effect on NVH.

Cheers, I will inspect them at the weekend, and go from there. :)