Anybody use Dynamat to reduce the road noise???? Does it work...thinking about putting it in my back seats and trunk. Thanks

 

Long ago, someone posted an extensive photo DIY of a very comprehensive Dynamat application. I doubt anyone has topped his work since.

While it's going to help a little (as laying Dynamat in my trunk did), it's going to muffle the exhaust note (within the cabin) more than it's going to lessen road noise.

The majority of the road noise comes from the front, as this guy determined. He said that there is a cavity aft of the front wheels, accessed via the rearward wheelwell plastic liner in the front wheelwell. The OEM 19/wheel combo is loud as it is, but he found that cavity to act as a resonance chamber for the noise of the front tires.

Rather than simply applying Dynamat to the inner panels, which would muffle the resonance chamber somewhat, he sought to eliminate it as much as possible. He filled that chamber with home insulation (from what I recall, he had some on-hand) that was wrapped and taped securely to prevent moisture from making it into the insulation. He did both sides.

He said that little trick had the biggest impact on reducing road noise, which is really significant if you had ever seen the DIY pics of his trunk, rear seat and side/quarter-panel areas. I seem to recall him saying how nice and quiet the ride is on the highway... ...which is why I remember this mod so vividly. I can't believe I haven't done this yet, as it's so simple... ...and I've spent the time laying Dynamat in the trunk already.

 

I had both front doors dynomatted in hopes of reducing the creaks and rattles. Unfortunately it created more.

 

Don't do it and just turn on your radio...Some did extensive dynamat and stuff but didn't get the road noise to get any better...It's a sport/lux car...The NSX makes a lot of noise but hey it's a sport car...

 

There are better sound-proofing materials than dynamat.

From what I learned in my research, the dynamat stops the resonating of what it is applied to, but does not deaden actual sound.

So while the sheet metal wont vibrate itself causing noise, which is a big problem with audio systems, the outside noises are still coming in.

I havent found out which, but I plan on using accousic foam on all the outside body pannels to keep sound in / out(like fender / door skins), and using a dynamat-like product (but half the price) on all the interior metal surfaces (under mouldings / rear seat etc) to keep that stuff from vibrating. The voids behind the front wheels and in the trunk will be filled with a home insulation.

 

Second Skin Audio has sound absorbing material. I used all the materials from Second Skin when I deadened my G. I started with the Damplifier material, then applied the Spectrum Sludge, then I topped it off with the Overkill foam. The foam is probably your best bet at soundproofing, but I think you should at least lay down a layer of Damplifier before you apply the foam. Overall, I'm pretty happy with my results. It's not Lexus quiet, but it's much better than stock. However, it is very labor intensive, so make sure you want to do it.

Here's a link to their website:
http://www.secondskinaudio.com/cgi-bin/index.cgi

Here's a link to my review and project results:
https://g35driver.com/forums/audio-video-electronics/93300-more-sound-deadening-g-pics.html