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Hi guys, Just joined up and hoping I can pick your brains on an issue I have.

I have recently had my 2013 Cayman S 981 (PASM) lowered using H&R sport springs by a professional garage who specialize in tuning cars for track use, however, since lowering, I have a "clunk" from the rear when I either go over a speed bump or when the rear is unloaded cornering....mainly from the nearside rear. I have been back several times and they simply cannot find what is causing this. They first thought it was the headlight leveling rods located at the rear of the car so they tightened them both as they seemed to have play in them since lowering but this hasn’t solved the problem!

Has anyone experienced this after lowering their 981's????

Any feedback / info will be greatly received so I can advise the garage what to do :)

Thanks in advance.
 

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You've just described what I hear all the time with my X73 suspension!
Could it be the hatch, now that you have stiffer/shorter springs? He said timidly...
 

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Discussion Starter #3
Hi dr Gandini, thanks for the reply. The hatch? certainly a problem created by installing shorter springs as suggested.

Thanks.
Jamie
 

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I recently had my Boxster lowered as well on TPC Racing springs by the Porsche dealership here. They brought to my attention an issue that occurred when they set the car down, that 3 people were required as the car was placed on the ground to ensure that the spring was seated properly given that it's so much shorter than the stock spring. They told me that if I ever "caught air" (which i hope to never do) that I might hear a bit of a clunk. I wasn't clear if the clunk was just something that would be an occasional minor nuisance or if it would actually require seating the spring again properly.

I called TPC and asked and they said they had never heard of such an issue.

Anyway, sounds similar to the problem you are describing. I'd be eager to hear others' experience with this.
 

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Theory I would have is the spring is shorter and going over a bump means that either it compresses and hits itself or decompresses and crashes on itself on the way down.
 

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Discussion Starter #6
Theory I would have is the spring is shorter and going over a bump means that either it compresses and hits itself or decompresses and crashes on itself on the way down.
True! however, I would of thought a well renouned global manufacture of springs would have picked this up during R&D testing......
 

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Discussion Starter #7
I recently had my Boxster lowered as well on TPC Racing springs by the Porsche dealership here. They brought to my attention an issue that occurred when they set the car down, that 3 people were required as the car was placed on the ground to ensure that the spring was seated properly given that it's so much shorter than the stock spring. They told me that if I ever "caught air" (which i hope to never do) that I might hear a bit of a clunk. I wasn't clear if the clunk was just something that would be an occasional minor nuisance or if it would actually require seating the spring again properly.

I called TPC and asked and they said they had never heard of such an issue.

Anyway, sounds similar to the problem you are describing. I'd be eager to hear others' experience with this.
Thanks for the feedback! do you ever experience the clunk over rough ground / speedbumps etc? Or they have just advised you may get this if you get airborne!

I think a call to H&R to see if they have heard of anything.

Thanks,
Jamie
 

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Subscribing to thread. Don't have a 981, but I do have adjustable coilovers on my 987. I hear similar clunk over speed bumps at low speeds. Definitely not from trunk. Suspecting it's bushings worn out (sway bar or control arm?). Worth a shot to take a look at those.
 

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Discussion Starter #9
Subscribing to thread. Don't have a 981, but I do have adjustable coilovers on my 987. I hear similar clunk over speed bumps at low speeds. Definitely not from trunk. Suspecting it's bushings worn out (sway bar or control arm?). Worth a shot to take a look at those.
Great! thanks for jumping in. I will make suggestions to the specialist when it goes back for another day!
 

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I have the H&R sport springs and I can't say I've heard any clunking over bumps. Scraping, yes, but no clunking.
 

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Discussion Starter #12
I have the H&R sport springs and I can't say I've heard any clunking over bumps. Scraping, yes, but no clunking.
Cool thanks...hear you on the scraping front! already trashed the rubber splitter!

Do you have PASM?
 

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True! however, I would of thought a well renouned global manufacture of springs would have picked this up during R&D testing......
If you bought it you are doing the R&D testing. It's a low volume car. Probably would go away if you had a helper spring to hold it in place when the damper compresses and then rebounds all of the way.

Anyway, it's not a safety or performance risk. It's an aftermarket part and they all have noise, vibration and harshness issues.
 
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I've only been driving the car for a few days since it's been lowered and haven't gone over many bumps. When I have, I've done it very cautiously. Hopefully get the car out to the track next week, I'll let you know if there are any issues with aggressive driving.
 

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Quite frankly, none of this sounds right to me. H&R does not just make a shorter coil and call it a day. They make a full length coil that has a few "dead coils" that compress sooner when the car is on the ground. In the air, the coil should still seat completely and correctly. A shorter coil also wouldn't explain why it's only making noise on one side. My 991 Turbo is lowered on H&R springs and makes no such noises. I sincerely think that your shop is blowing smoke up your butt to cover up some shoddy work. I would get it checked out by another shop.

- Patrick
 

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Do you have stock drop links? Take a look at both sides and make sure they are installed the same and that one is not bent or broken. Also make sure the upper mount for the links is not damaged. Just something to check. Good luck.
 
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