Sound deadening?

[tak-]

I completely stripped my interior to do some rust work, and what not. I am all for weight reduction, but I would personally rather buy a lightened flywheel and driveshaft and pulleys than sacrafice ride quality for a DD. I have contemplated running a bare interior for a while, but the road noise is too much. So here are my questions:

1. How much does stock sound deadening weigh?
(I removed mine, and the bag was pretty heavy)

2. How much would re-deadening the floor, doors, flywheel, and hatch weigh?

3. What sound dampening/deadening materials does everyone use? I have heard of alot of cheaper dynamat alternatives, and suck of them being not so good.


I appreciate the help and any suggestions you may have.

[slideways2004]

depends on what you use. i think the spray stuff is the lightest b/c you can apply it where you want it. and you can do a light coat.

i felt that dynamat stuff and it's pretty heavy and thick.

[TheWolf]

I used fatmat in my car. Now it's not like Mercedes benz quiet inside but it's substantially quieter. I will probably add some more in later for a nicer quieter ride. I will say that the fatmat stuff sticks like glue. I bought 100sqft and had enough to do the floor areas twice and everything else once. That included the trunk area on my s14 which made a substantial difference. Definite upgrade for those of you with sub's. 100sqft is around 60lbs so it's not a big sacrifice for quiet interior. I'm going to try it under the hood next. Hard to say if the fiberglass hood made any larger dB of a difference. A good coating of undercoat underneath the chassis should help as well. Stock sound deadening sux but if you don't mind an extra 100lbs you can have a very very quiet ride and pull the 100lbs from elsewhere if you are super conscious of weight savings. Making sure you properly isolate and insulate your shifter and the hole for it makes a difference. The spray stuff is lighter in weight but not as thick. 2 gallons usually covers 100sqft and doesn't work as well IMHO. Maybe as a top coat for the fat mat or to cover the areas that would suck to cover.

[S14DB]

I like Tsunami by Metra. The Alum backed stuff works best. Just go around and tap on parts and panels like a drum. What ever sounds like a drum and not a thud needs to be matted. Cut out a piece about 1" smaller in diam and apply with a Wallpaper seam roller. Any joints cut 1" wider than the joint/part.

[alexchanman]

dyna mat works really well and they have different kinds of it for every part of the car like the trunk, cabin and so on. i dont think its that heavy but if you have alot of it, it does all add up.

[S14DB]

It's lighter than the stock shit and you'll use less of it if you only do it were you need it.


Carpeting make a huge diff.

[tak-]

i meant to say firewall not flywheel ;]

[projectRDM]

I dropped the wallet and had the entire interior sheetmetal from the footwells back to the rear trunk wall sprayed in bedliner material. Beforehand I spent a few hours taping up all the spare bolt and access holes and covering any open areas with rubber matting so it's now completely sealed and looks more unibody instead of the swiss cheese it comes from the factory. Added about 35 pounds total but deadened the car considerably. I plan to fill the rear quarters and line the backs of all the interior panels with jute padding when I get time for further reduction.