From: Pete Whelan [whelan4@sio.midco.net]
Sent: Tuesday, June 03, 2003 8:36 PM
To: 928
Subject: [928] Re: "Quitten that shark"

You'll notice I am replying to a rather dated message. That's because I 
just finally got around to tackling this one. Indeed, where James describes 
using the closed cell foam really works. I also took out the big rear 
speakers and discovered a cavern that descends in to the unibody. After 
consulting with 928Intl to make sure I would do no harm, I filled this area 
with "great stuff" too. So now the interior noise level of my 928 is 
definitely reduced. Great tip!

Pete Whelan
1988 Porsche 928S4 (RMB & OTT-X)

At 08:33 PM 12/10/1999 -0600, James Mayzurk wrote:
>I've had a lot of success making my shark quieter.  Did the full Dinamat 
>treatment to the floors
>and side panels, very minor improvement.  The biggest change with the 
>Dinamat was when I did the
>doors,  which helped much more than the floor (with Dinamat).  Still not 
>satisfied, I then removed
>the rear wheel arch liners on the front half of my 89GT.  Most of the 
>noise I was hearing, besides
>my RMB, was tire noise.  I then stuffed "Closed Cell" foam into the two 
>cavities and  injected the
>foam in a can you can buy at Home Depot.  Took about two cans on the 
>driver's side and one can on
>the passenger side.  WHAT A DIFFERENCE!  This final step almost completely 
>eliminated all of the
>tire noise!   I discovered my stock stereo speakers had frequency and 
>tonal range I didn't know
>existed, the equivalent of adding about 20 watts to my stereo 
>amp.    Total cost less than
>$20.00.  Try it, you won't be disappointed.  One last point, be sure to 
>use closed cell foam, it
>won't absorb moisture and hold that moisture up against your body 
>panels.  If you can't find the
>closed cell foam you could use just the injected foam in a can, but it 
>will take a lot more.
>
>Jim Mayzurk
>89 928GT