Nissan 370Z Forum - Dynamat worth it ? - quoted $450 from audio shop

Nissan 370Z Forum (http://www.the370z.com/)

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- - Dynamat worth it ? - quoted $450 from audio shop (http://www.the370z.com/exterior-interior/98977-dynamat-worth-quoted-450-audio-shop.html)

Quote:

Originally Posted by AdamRacer (Post 3060671)

Has anyone just put a stuffed amount of acoustic foam in the rear hatch area underneath the carpet? Then possibly topped with a thicker carpet or closed cell foam mat on top to block road noise from back there?

I'm wondering if this would make a difference or not if it was filled/stuffed in the open areas underneath.

I think it would. Pretty sure someone stuffed a moving blanket in there and noticed a difference. And quietest my car has ever been was when I had a couple good size soft-sided coolers in the back. IMHO, the big thing is to keep the sound from bouncing off the glass and forward to the seats. The glass is like a perfect cone to send the sound forward. Not sure that it's as much of a decibel problem as it is a focus of the soundwaves problem.

Quote:

Originally Posted by AdamRacer (Post 3060671)

After I had the interior panels re-installed after installing the sound damping, but without spare/sub/carpet, the cabin was pretty noisy. The damping material helped a lot, but it was still noisier than no damping with spare/sub/carpet. Put everything back in the car and it was much quieter than without damping. So, yeah, I'd say that something like a thicker pad under the carpet would help.
You can install sound damping in the floor of the hatch area without doing any major dis-assembly of the interior. Should have the same (or better) effect than thicker pad/carpet. Covering the strut towers and wheel wells will do more good but you have to remove interior panels.

ScottIN is right about the back glass - great sound reflector. Nice if you have a Bose sub but terrible for road noise. Some internal louvers might help but there's not a lot you can do about it.

Thanks! I think I'm going to try just to see if it'll help a little. I've kinda gotten used to the road noise until I drive another car lol..

This is something...

I'm going to try to tackle over the winter.
I have NO experience with cars but worked building offices for years in buildings where we tried to keep noise from being transmitted to adjacent offices from audio/video/boardrooms, etc. Hence, I subscribe to the school that you use a layer of dampening material, a layer of close coupled foam, a layer of sound blocker and if you have the additional space, some sound absorber.
This is the site I found valuable.

Welcome to Sound Deadener Showdown | Sound Deadener Showdown

My intentions are to do my install following this guy's methods. It remains to be seen what room I will have on the sides of the hatch and the doors. I see no issues with the hatch floor.
It looks as though I need at least 3/8".....more would be a luxury. The layer of absorber may wind up being deleted on the hatch sides and doors.

104

Quote:

Originally Posted by nvdave04 (Post 3053736)

So I'm sick of hearing rattles since adding new exhaust and also sick of hearing this crazy loud road noise - I got a quote to have a audio shop use an entire roll of Dynamat in rear adding in panels as well and using 3m tape on anything possibly rattling. He says he has done this job several times on 370z before bc when installing audio it always rattles. He swears this will solve my rattling issue and will be able to actually have a phone call without holding my ear to hear the person talking lol I just think $450 is a lot for this but he said it's going to take atleast 5 hours of labor.. The good thing is the wife is paying half for my Xmas present so that helps - do you all think it's worth it for those who has done this ?

I have inquired in my area and it was 400 with hush mat for the door panels and rear hatch area. Its worth that price in my opinion.