Springs interchangeable?
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Intermediate
Joined: Dec 2012
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From: Potomac, MD
Springs interchangeable?
I’ve searched the forum and can’t find an accurate answer on the subject. I have a 991.2 C2 and was looking to lower it a bit while stiffening the suspension a bit. Im considering the H&R springs but noticed that the GTS version has a slightly different part number. I’m only assuming the difference is the spring rate is stiffer for the GTS. Anyone know any more detail on this?
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The GTS comes standard with SPASM, which is both stiffer and lower. Not sure if the perches are different between PASM and SPASM, but if so that would easily explain the different aftermarket part numbers (and also prevent interchange). Could also be that the shock damping is different between the two, and the aftermarket spring takes that into account -- though I doubt it.
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My 2014 991 C2S has the PASM Sport option, which is the same suspension as the GTS, and my understanding is the parts from a GTS bolt right on. I'd be surprised if it's not the same on the .2.
Last edited by CarreraFahrer; Oct 19, 2022 at 01:11 AM.
Burning Brakes
Joined: Aug 2018
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From: San Diego
The GTS comes standard with SPASM, which is both stiffer and lower. Not sure if the perches are different between PASM and SPASM, but if so that would easily explain the different aftermarket part numbers (and also prevent interchange). Could also be that the shock damping is different between the two, and the aftermarket spring takes that into account -- though I doubt it.
OP - might be worth checking the damptronics. Same manufacturer of the Porsche suspension but note they are progressive vs what we have, which are linear. I would be leery of the lowering kits as the ride and performance will suffer.
Burning Brakes
Joined: Aug 2018
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From: San Diego
Springs not matched to dampers, on a track or in the twisties, are not a good thing. May look sexy but just google some feedback around the tech art lowering kit and the 991 and you will see. Just depends on what you are looking for, rolling art or rolling performance.
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Thread Starter
Intermediate
Joined: Dec 2012
Posts: 30
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From: Potomac, MD
I’d like the best of both worlds if possible. I’m only looking to lower around an inch but every spring I’ve seen is progressive and I’d absolutely prefer linear if possible. Any suggestions?
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Other considerations apart from appearance: the Sport suspension (option on the S, part of the GTS package) had shorter, stiffer springs AND a stiffer roll bar. The shocks were a separate thing- PASM - with adjustable rebound rates. There are also individual alignment specs depending on configurations.
Last edited by chuckbdc; Oct 20, 2022 at 01:18 PM.
