How many square feet of damplifier pro would i need to cover the whole interior of the car?

 

and where could i get rubber plugs for the holes in my firewall, now that i removed the a/c setup?

 

no clue on the deadening, i cut little squares out of sheet metal and epoxied them in and painted them to match

 

A little bit of math will tell you how much mat you need to lay down:

Area = L x W

So just divide the car into squares and rectangles, calculate the areas, add those together then just add a percentage for error (20% or so). That will give you a rough idea. Then buy a little extra to account for curved surfaces.

The rubber plugs are available from good auto parts stores.

 

yea i know what equation to use, i was asking to save time, since alot of people have already done this... ; )

 

RX-7 owners have done this before????

 

are you going to be scraping up all the old crap and using this in its place?

 

yea i got the idea from a thread a couple days ago, and i think im going to scrape the tar off, im not sure yet

 

I did. I laid down a layer of RAAMat BXT that covered the doors, front floor, and the rear wheel wells. I still had material left over to cover the rear hatch floor (not under the storage boxes though). One roll was 62.5 sq. feet. I also user a single layer of Ensolite to cover the doors and the inside of plastic trim panels, and used RattlePad closed cell foam on the main floor, the hatch mat, inside of the rear quarter trim, and some other areas. All the jute backing was replaced with closed cell foam.

Bear in mind, I only used one layer of dampening mat (not counting the foams) overall because I didn't want to add on too much weight, I retained the factory sound deadener and focused most of my attention on the doors (it has a layer of BXT on the inner support beam, the holes are covered with aluminum sheets and sealed with aluminum tape, and a square sheet of thicker closed cell foam behind the speaker). A second or third layer of Butyl-based sound deadener may be desirable. What you're doing is eliminating resonance (that hollow tin-can sound) by damping it.

Oh, and here's a little tip: If your cardboard jack cover is warped and worn out, you can make a new one with a piece of aluminum sheeting, and two layers of foam on both sides using the old cover as a template.

And avoid the cheap asphalt-based stuff. You want butyl-based.

Check out this thread for more information:
http://forums.maxima.org/showthread.php?t=31028100

It has several links to various how-tos and other information. It should help in selecting materials and in determining how far you want to go. Incidentally, I didn't go that far.

Especially focus on page two of the thread, knapp9 has a few descriptions and some threads on sound deadening project he did. The Maxima http://forums.maxima.org/showthread.php?t=370523

The one on a Ford Escape shows you a pretty real-world application of deadening material: http://www.secondskinaudio.com/forum...ead.php?t=1849

Also, this site compares various manufacturers and explains a few things about sound deadening:
http://www.sounddeadenershowdown.com/