Cabin noise - Pressure "Booming"

[Alun Rowe]

My Cayman 987S PDK seems to have a "booming" noice like aa pressure change upwards from 15mph.  It disappears under hard acceleration but cruising it's constant.  Like a sort of Sub Bass noise?  It's headache inducing after a long journey and I didn't have it all on my non-S PDK.

 

I found a few threads on it but wanted to discuss with a wider audience before trying things out form them... https://www.6speedonline.com/forums/boxster-cayman/284054-solution-cayman-cabin-buffeting-pressure-modulation-sonic-boom-problem.html

 

The car has 80,000 miles o it so I guess some bits might need refreshing...

 

Has anyone else experienced this?

 

Cheers,

 

Alun

[Alun Rowe]

Found this link today so some more ideas to try...

 

https://www.planet-9.com/987-cayman-and-boxster-problems-and-complaints/16384-trunk-boom-i-solved-tightening-rear-rubber-studs.html#/topics/16384

[twopointnine]

What diameter wheels and make of tyres do you have? On my previous 987.2 2.9 with 19” wheels I got that noise with Pirelli tyres but changing to Michelin PS2 made it a lot less noticeable. You could try dropping the tyre pressures by a couple of psi.

 

I don’t notice the noise at all on my 987.2 S PDK on 19” Michelin PS2s but it does have PASM which I run mostly in comfort mode.

[Alun Rowe]

18” wheels.  The car had 19’s but I swapped them out as I didn’t like that type and the 18’s are cheaper to put rubber on

 

ill check the tyres later but iirc there are Pirelli on the back and Michelin on the front.  Something I need to sort soon...