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 Posted: Dec 27, 2022 12:25PM
Total posts: 1364
Last post: Feb 5, 2023
Member since:Jul 15, 2008
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US
Rosebud is a noisy car. A 14" resonator—no muffler [link], all factory soundproofing removed, lots of metal-to-metal heim joints, no headliner, etc. I installed .067" Dynamat on the floor & interior firewall and put down carpet. I installed ?" heat & acoustic damping closed cell foam under the fiberglass bonnet. I didn't use Dynamat on the door interiors, rear quarter panels or the interior roof. Dynamat is heavy and I didn't want that much weight up high. Besides, I have a carbon fiber roof and the underside looks kinda cool.

After all the soundproofing, Rosebud is still a noisy car. I can't quantify the noise reduction the Dynamat provides, perhaps it's considerable. Still, normal conversation is impossible and ear plugs are mandatory. No stereo, of course. When tunes are needed, my iPhone and noise cancelling headphones do the trick. The majority of the sound comes from the exhaust, but there's still a lot of rattles, clanks, and harmonic buzzing. I wanted a street racer, so I guess that comes with the territory.   

 

Michael, Santa Barbara, CA

. . . the sled, not the flower

      Poser MotorSports

 Posted: Dec 26, 2022 03:11PM
Total posts: 598
Last post: Dec 26, 2022
Member since:Mar 11, 2010
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BO
I put a Butyl rubber product on the floor, and Dynamat HOODLINER on the hood.




And since it is a PUP, and I did not have the roof frame, I put the butyl product on the roof before gluing material to it.

 Posted: Dec 21, 2022 11:18AM
Total posts: 4419
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US
I did it and it was a night and day difference.  Prior to installing the sound deadening (Dynamat or some equivalent...  It's been too long), I could hear the sucking of the carburetor as well as every other noise under the bonnet.  After installing the deadening, it was almost a modern driving experience.  I could carry on a conversation at normal levels with my wife, instead of yelling to be heard.  Of course, it did nothing for my ability to hear her...   :-)

**Dr. jinG**

"I tell you and you forget. I show you and you remember. I involve you and you understand." ~ Eric Butterworth
"The true charter of liberty is independence, maintained by force." ~Voltaire

 Posted: Dec 20, 2022 05:37AM
Total posts: 210
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Member since:Nov 9, 2013
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I used an Eastwood product. Worked a treat.

 Posted: Dec 19, 2022 12:53PM
Total posts: 14
Last post: Jan 20, 2023
Member since:Oct 2, 2011
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I am planning on applying some Dynamat or similar product to the fire wall and under the bonnet......has anyone tried this, and how successfull was it?