Reducing cabin noise
Discussion
In modifying the suspension on my 987.1 Cayman S I seem to have very subtly turned the small cabin into an amplification chamber where the increased vibration in conjunction with road noise and my catback exhaust is conspiring to make it an unpleasant place on longer journeys. It doesn't help that I suffer from travel sickness under certain specific circumstances. I am hoping over the winter to be able to take steps to lower the cabin volume. The exhaust noise is fine on its own and is not a problem but I would really like to remove some of the other noise which is being amplified.
Has anyone done anything similar and can offer advice/suggestions?
TIA
Has anyone done anything similar and can offer advice/suggestions?
TIA
What modifications to the suspension did you do? Poly bushes and firmer springs? Solid top mounts?
Noise, vibration, and harshness (NVH) packaging and how manufacturers reduce NVH is a science. Porsche will have worked pretty hard on the NVH packing already so it's unlikely that you will achieve miracles with DIY type sound deadening but you can improve it.
If you have gone for a hard suspension setup, the issue is possibly caused by the lack of isolation that the new suspension has. If the joints and mounts are firmer, it will increase road feedback back for the driver feel but transfer the NVH into the cabin.
If you can, remove the interior and add weight to any area of panels that have the ability to move (vibrate) via a suitable sound deadening material. Any cavities behind any panels will need covering with foam.
Make sure you return any of the standard sound deadening & trim over the top of the material you add properly and ensure all clips are fixed correctly because every single one of those clips has a job to do fixing that trim in place to avoid vibration (noise).
Noise, vibration, and harshness (NVH) packaging and how manufacturers reduce NVH is a science. Porsche will have worked pretty hard on the NVH packing already so it's unlikely that you will achieve miracles with DIY type sound deadening but you can improve it.
If you have gone for a hard suspension setup, the issue is possibly caused by the lack of isolation that the new suspension has. If the joints and mounts are firmer, it will increase road feedback back for the driver feel but transfer the NVH into the cabin.
If you can, remove the interior and add weight to any area of panels that have the ability to move (vibrate) via a suitable sound deadening material. Any cavities behind any panels will need covering with foam.
Make sure you return any of the standard sound deadening & trim over the top of the material you add properly and ensure all clips are fixed correctly because every single one of those clips has a job to do fixing that trim in place to avoid vibration (noise).
Great idea chaps if it wasn't for the fact I have the radio delete option in my cayman! I have bilstein pss9 with Rss lower control arms ,toe steer kit, slightly firmer gearbox mounts, carnewal cat back exhaust, gt3 throttle and Ipd plenum etc. I think the cabin noise was quite bad when the car was stock and over time I've gradually made it worse so what was tolerable has now become a bit irritating so I just want to take the sting out of it. It's hard to describe but the exhaust noise is fine it's the other 'road' noise that I want to get rid of. I think I may try doing some deadening in stages starting with the front area, arches and wheel wells and work my backwards.
kel176506 said:
What modifications to the suspension did you do? Poly bushes and firmer springs? Solid top mounts?
Noise, vibration, and harshness (NVH) packaging and how manufacturers reduce NVH is a science. Porsche will have worked pretty hard on the NVH packing already so it's unlikely that you will achieve miracles with DIY type sound deadening but you can improve it.
If you have gone for a hard suspension setup, the issue is possibly caused by the lack of isolation that the new suspension has. If the joints and mounts are firmer, it will increase road feedback back for the driver feel but transfer the NVH into the cabin.
If you can, remove the interior and add weight to any area of panels that have the ability to move (vibrate) via a suitable sound deadening material. Any cavities behind any panels will need covering with foam.
Make sure you return any of the standard sound deadening & trim over the top of the material you add properly and ensure all clips are fixed correctly because every single one of those clips has a job to do fixing that trim in place to avoid vibration (noise).
Thanks for your detailed replyNoise, vibration, and harshness (NVH) packaging and how manufacturers reduce NVH is a science. Porsche will have worked pretty hard on the NVH packing already so it's unlikely that you will achieve miracles with DIY type sound deadening but you can improve it.
If you have gone for a hard suspension setup, the issue is possibly caused by the lack of isolation that the new suspension has. If the joints and mounts are firmer, it will increase road feedback back for the driver feel but transfer the NVH into the cabin.
If you can, remove the interior and add weight to any area of panels that have the ability to move (vibrate) via a suitable sound deadening material. Any cavities behind any panels will need covering with foam.
Make sure you return any of the standard sound deadening & trim over the top of the material you add properly and ensure all clips are fixed correctly because every single one of those clips has a job to do fixing that trim in place to avoid vibration (noise).
AH! Ha Ha, thats a serious setup which is going to be hard to reduce the cabin noise back to a level thats less intrusive. The trade off (compromise) is between the Cayman's now improved handling & responses or having a softer setup that adds an isolator between the vehicle and strong vibrations.
Tyre Roar is a constant but the suspension & gearbox mount are the worse offenders/culprits because they can have so much vibration and movement to transfer and the mods are now adding to the NVH transfer. It's unlikely you can actually reduce the NVH with sound deadening as mentioned before without removing the modifications.
Ear plugs will definitely help but a good solution is noise cancelling headphones. Although you may get some funny looks from other road users!
Tyre Roar is a constant but the suspension & gearbox mount are the worse offenders/culprits because they can have so much vibration and movement to transfer and the mods are now adding to the NVH transfer. It's unlikely you can actually reduce the NVH with sound deadening as mentioned before without removing the modifications.
Ear plugs will definitely help but a good solution is noise cancelling headphones. Although you may get some funny looks from other road users!
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