[ds968]

Right ;-) . Back to noise - it actually makes the exhaust tune better because so many of the other ride related noises ( at least for those of us with coupes ) are significantly reduced or muffled out entirely.

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[rxter]

Thank you MB for a very interesting explanation of the viscoelastic properties of the guey stuff on the dynamat. I learned a ton in your 3 or so posts.



And of course thank you ds for your singular sense of humor. Being very careful to protect my delicate sense of hearing I have also spent many hours in the ear saving local, so unfortunately I learned little from that post, yet enjoyed it immensely. Back to sound.



Both of my cars made/make a sound that I am going to post as a poll to gain a bit more readership that this stale dynamat discussion.



Seriously MB - great stuff keep it coming.

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[MB968]

[quote name='rxter' timestamp='1331601356' post='123221']

Thank you MB for a very interesting explanation of the viscoelastic properties of the guey stuff on the dynamat. I learned a ton in your 3 or so posts.



Seriously MB - great stuff keep it coming.

[/quote]



Glad its of some interest. Since I've been retired for a while I don't get to talk technical much. This disc'n brought back some old memories as in the late 70s and early 80s I helped redevelop a line of viscoelastic mat'ls we used mostly for reducing mechanical instabilities on our equipment. They originally contained a plasticizer that was later banned, PCBs. Virtually all the early techie part of my carear was focused around the field of dynamics, chatter, vibration and noise control.

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[polliviere]

Having just completed the processes of replacing the carpet in my 93 Cab and adding Dynamat to the floor, doors and firewall, I think I can offer a new and objective view of the benefits pro or con of this upgrade. I can't speak to the science but whatever the technical aspects are it works, and works very well. Whatever sound was eliminated or tuned down resulted in the car having a quiter more solid feel.



I did not do the trunk and am not sure I will because I am happy the way the car is now. I will say that if you do nothing else, do the doors. I find myself opening and closing them just to hear that solid thump when it closes.



Cost was nominal, i used 36 square feet of Dynamat Extreme at a cost of $148. The material added 21Lbs to the car but I must have taken out half that in glue.



One point that I did not expect was the sound of the exhaust seems softer in the car. I have the stock system and at some point will upgrade to a cat back system. My last Cab had the BB system on it and i loved the sound. What happens now it that the sound disappears into the general road noise unless getting on it. I've lost just a little to much of the sound I like, so it looks like a new cat back system is in the near future.





Peter

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[Rap]

I have been uncharacteristically lazy in replacing my stereo because I love the sound of my catback. My employees love it too because they can hear me coming from a good distance!

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