Z1 S Pro Coilovers Clunky Sound Issues

[papozalsa]

I just got my set of S Pro coilovers installed about a month ago. I am experiencing the same issue. Is going back to get inspected again by the Technician that installed them. This seems to be a frequent enough issue where there are multiple reports and I fail to do the research. After a month fighting with Z1 they offered to send me a rear set. Having an issue like this with a brand new part does not sit well with me. Now I'm at a crossroad, replacing them with something else because anyway I'm going to lose more money. and I'm not happy with a 24 Z that rides like a 1979 Dodge. I really do not want to install another set and have the same issue and my bank account keeps going down.

 

[Arashi_z_]

I just got my set of S Pro coilovers installed about a month ago. I am experiencing the same issue. Is going back to get inspected again by the Technician that installed them. This seems to be a frequent enough issue where there are multiple reports and I fail to do the research. After a month fighting with Z1 they offered to send me a rear set. Having an issue like this with a brand new part does not sit well with me. Now I'm at a crossroad, replacing them with something else because anyway I'm going to lose more money. and I'm not happy with a 24 Z that rides like a 1979 Dodge. I really do not want to install another set and have the same issue and my bank account keeps going down.

I ended up going with the nismo coilovers-they don’t and can’t go as low as others but the quality seems much better. I will say after I replaced my clunky shock it was fine and I never experienced the issue again-but I still didn’t trust the quality of z1 s pro so I sold them. Good luck! Nismo does a few 20% off sales throughout the year, watch for those!

 

[papozalsa]

I ended up going with the nismo coilovers-they don’t and can’t go as low as others but the quality seems much better. I will say after I replaced my clunky shock it was fine and I never experienced the issue again-but I still didn’t trust the quality of z1 s pro so I sold them. Good luck! Nismo does a few 20% off sales throughout the year, watch for those!

Can you get the height on the back from the ground to the fender? I do not like it too low just to close the gap. Thanks

 

[NorthSaltJake]

I just got my set of S Pro coilovers installed about a month ago. I am experiencing the same issue. Is going back to get inspected again by the Technician that installed them. This seems to be a frequent enough issue where there are multiple reports and I fail to do the research. After a month fighting with Z1 they offered to send me a rear set. Having an issue like this with a brand new part does not sit well with me. Now I'm at a crossroad, replacing them with something else because anyway I'm going to lose more money. and I'm not happy with a 24 Z that rides like a 1979 Dodge. I really do not want to install another set and have the same issue and my bank account keeps going down.

Had the same clunk in the rear after installing my S Pros. Adjusting the preload on the back fixed it no more noise at all. It’s a common issue with these. Before swapping parts, try dialing in the rear preload. Made a huge difference for me, been noise-free for over a month and 800 miles.

 

[papozalsa]

Had the same clunk in the rear after installing my S Pros. Adjusting the preload on the back fixed it no more noise at all. It’s a common issue with these. Before swapping parts, try dialing in the rear preload. Made a huge difference for me, been noise-free for over a month and 800 miles.

Pardon my stupidity, but how do you adjust the preload? Are the coilover supposed to come with the preload set already?

 

[NorthSaltJake]

Pardon my stupidity, but how do you adjust the preload? Are the coilover supposed to come with the preload set already?

Step 16 forward in the Z1 instructions covers it, but yeah it’s a little confusing. You set the spring preload, use a second jack to lift the spring into position, then adjust the shock length. I had to extend my rear shocks a lot before everything lined up, but once I did, the clunking was gone. If the shock isn’t extended enough in the rear, you’ll definitely get that noise. Here’s the install PDF for reference:

https://cdn.z1motorsports.com/upload/Install_Z1_Z34_S-Pro_Coilovers.pdf

Also, here’s my Z with the ride height after adjusting preload. No more clunk and it sits right where I want it for daily and spirited driving.

 

[papozalsa]

THANKS!

Step 16 forward in the Z1 instructions covers it, but yeah it’s a little confusing. You set the spring preload, use a second jack to lift the spring into position, then adjust the shock length. I had to extend my rear shocks a lot before everything lined up, but once I did, the clunking was gone. If the shock isn’t extended enough in the rear, you’ll definitely get that noise. Here’s the install PDF for reference: