sound deadening

[undercnstrction]

i'm sure this topic has been discussed on here before but i apparently can't figure out how to find it with the search button.....

any recommendations on which sound deadening to use? after the roll bar goes in i'm going to put something in there to make it much quieter than it was before. i've seen dynamat, hushmat, lizard skin, second skin, etc etc. is one better than another? i like the idea of the lizard skin because it would get into all of the corners and crevices and the fact that's it's seamless. But i'll go with the sheets of whatever if that's the better product.

 

[RatStang]

Do you have the whole interior removed for the cage install? If so you might want to consider a sound deadener that either sprays on or is put on with a roller/brush.

 

[castine917]

i used the sheets of dynomat in mine. since then things have gotten better in sound deadening and spray or roll is the best now for many reasons.

 

[El_CUCUY]

i'm gonna use lizard skin on my project...

 

[fiveohwblow]

This is a new topic for me. Which is the better product, spray or roll? And also, what brand is best?

 

[undercnstrction]

the interior isn't out yet, but will be soon.....hopefully.

i remember seeing lizard skin on one of those sunday morning DIY car shows on spike. they seemed to like it, but i'm going to go out on a limb here and assume they were PAID to say that .

 

[Deleted member 87397]

Lizard skin is pretty cool stuff but it's expensive. More so than Dynamat. You can roll or spray Lizard skin but if you want to spray it on and don't have the equipment, there's another investment.

 

[Shaolin Crane]

i used hushmat in all my vehicles. But that brings me to my next question. You're putting a cage in your car, then sound deadening, then full interior i assume. You do know your car is going to weigh as much if not more than an s197 right?
You're looking at 120-160lbs for a 8 point cage, then another 60-100 lbs of sound deadening. Plus all the stereo stuff im sure you're going to run you're looking at 3560lbs. Before driver, that car is gonna be a pig, you need to focus on what you want the car to do, all that weight isnt going to help your car handle better

 

[RatStang]

i used hushmat in all my vehicles. But that brings me to my next question. You're putting a cage in your car, then sound deadening, then full interior i assume. You do know your car is going to weigh as much if not more than an s197 right?
You're looking at 120-160lbs for a 8 point cage, then another 60-100 lbs of sound deadening. Plus all the stereo stuff im sure you're going to run you're looking at 3560lbs. Before driver, that car is gonna be a pig, you need to focus on what you want the car to do, all that weight isnt going to help your car handle better

I've looked into this a little bit (read: I'm no expert but this is what I've found).

The Lizard Skin required for Fox should come out to less than 2 gallons total assuming you're spraying it on the floor pans and driveshaft tunnel. One gallon covers approx 50 square feet at 20 mil thick. Assuming that you're applying the sound deadener only, you're looking at MOST (after drying/curing) at adding 12 lbs total weight to the car with a 40 mil coating.

One gallon of the stuff only weighs 13 lbs. wet. Dry... It weighs roughly .12 lb / sq foot. @ 20 mils thick. So even 100 square foot (more floor than we have in our cars) you're looking at 12 lbs.

2 gallons of this stuff cost $150. That much lizard skin again, covers 100 sq.ft @ 20 mils.

4 square feet of Dynamat costs $42.95.

The point is that with the lizard skin, you can afford to spend the $79.95 on the spray gun kit and STILL come out way ahead of the Dynamat... even if you wanted to apply a 40 mils thick layer.


Personally... I wouldn't be looking for anything more than a 20 mils thick layer on a Fox body. The majority of the noise you get on these cars is wind noise though the door seals and the result of the "flying brick" aerodynamics anyway. The sound deadener should greatly reduce the road, tire, and suspension noise. If you pull the dash and spray the firewall well... all the better!

 

[Shaolin Crane]

The liquid stuff never works as well as sheeted deadeners. Hushmat is a foil lined butyl material. Sound, heat, everything is much better insulated with those types. Lizard skin is FAR easier to apply but i dont think it works all that great, none of the spray on **** does. Yes hushmat is expensive but everything that's good is.

And the myth about our foxes being flying bricks, well thats another debate, but they are actually VERY aerodynamic. A 87 mustang gt has a drag coefficient of .38 compare that to a c6 vette which is .34 not too shabby IMO

 

[castine917]

hushmat and dyynomat are better insulators but the cost is in all the extra weight and dollars. the spray and roll on are a compromise between nothing and heavy expensive insulation.

 

[2000xp8]

How about the ACC mass back carpet that supposidly has rubber in the middle?
I need a new carpet and was thinking of doing that.
It's like $40 more than a regular replacement carpet.

 

[undercnstrction]

i used hushmat in all my vehicles. But that brings me to my next question. You're putting a cage in your car, then sound deadening, then full interior i assume. You do know your car is going to weigh as much if not more than an s197 right?
You're looking at 120-160lbs for a 8 point cage, then another 60-100 lbs of sound deadening. Plus all the stereo stuff im sure you're going to run you're looking at 3560lbs. Before driver, that car is gonna be a pig, you need to focus on what you want the car to do, all that weight isnt going to help your car handle better

excellent points!

it will have a full interior (i'm thinking about deleting the back seat but haven't decided on that just yet, which probably doesn't weigh more than 20lbs anyway.) but it won't have a bonkers stereo.

i had not thought about the cage weighing that much. my main idea behind the cage was the safety and chassis stiffening. i could probably forget about the cage since i plan to run subframes anyway and this car will spend the VAST majority of it's life on the street. which is why i'm looking into the sound deadener.

as far as the sound deadening, i knew that it would add weight but had not gone far enough to calculate out the # of lbs yet. the little bit that i had heard about lizard skin is that it added very little weight. how much difference did the hushmat make with interior noise on your vehicles? did you use it on the mustang in your sig or did not use it there because of the weight? what made you go with hushmat over the other "sheet" material available?

 

[undercnstrction]

How about the ACC mass back carpet that supposidly has rubber in the middle?
I need a new carpet and was thinking of doing that.
It's like $40 more than a regular replacement carpet.

if i remember correctly there was another post on here somewhere where the mass backing was highly recommended. i'll be replacing mine as well (since i currently have porno red) so i'll be curious on the responses to this question as well.

 

[90lxcoupe]

i used hushmat in all my vehicles. But that brings me to my next question. You're putting a cage in your car, then sound deadening, then full interior i assume. You do know your car is going to weigh as much if not more than an s197 right?
You're looking at 120-160lbs for a 8 point cage, then another 60-100 lbs of sound deadening. Plus all the stereo stuff im sure you're going to run you're looking at 3560lbs. Before driver, that car is gonna be a pig, you need to focus on what you want the car to do, all that weight isnt going to help your car handle better

I'd say your numbers are a little off here, before my cage, my car weighed 2960 with MM full length subframes. After the MM subframes were removed, and the thru the floor subframes and 8pt 1 3/4" moly rollbar was put in the car tipped the scale at 2980. So id guess the bar weighs about 80 lbs max, thos MM subframes were heavy, but def nowhere near 100 lbs. Also, i ordered 100 sq feet of FatMat, which weighed 47 lbs and is 70mil thick, just slightlyh thicker than dynomat extreme which is 67mil. So you could get away with less than 40lbs of sound deadening because i highly dowbt that your going to use 100 sq ft of sound deadening in these cars.

 

[undercnstrction]

I'd say your numbers are a little off here, before my cage, my car weighed 2960 with MM full length subframes. After the MM subframes were removed, and the thru the floor subframes and 8pt 1 3/4" moly rollbar was put in the car tipped the scale at 2980. So id guess the bar weighs about 80 lbs max, thos MM subframes were heavy, but def nowhere near 100 lbs. Also, i ordered 100 sq feet of FatMat, which weighed 47 lbs and is 70mil thick, just slightlyh thicker than dynomat extreme which is 67mil. So you could get away with less than 40lbs of sound deadening because i highly dowbt that your going to use 100 sq ft of sound deadening in these cars.

i have not heard of FatMat. looks like i have something else to look up are you happy with how well it worked? would you recommend it?


just went through their site. they have a TON of different products!

 

[90lxcoupe]

i have not heard of FatMat. looks like i have something else to look up are you happy with how well it worked? would you recommend it?

I havent installed it yet, going to put it in this week, it was 240 for 100 sq feet so its about 4x cheaper then dynamat and it looks pretty good in the roll. I did some reading on sound deadener and it seems that the only way your goin to keep the sound out is to use something thats like a plyable lead, and thats gonna add a ton of weight.

So basically the way i looked at it is the fatmat will be better than nothing at all, and from what i read about it, people say it definitly helps that have installed it. I know its not going to seal the car, but it should help with heat and keep SOME noise out. You gotta figure that the floorpans on these cars are only .030 thick so anything is gonna help

 

[Shaolin Crane]

I'd say your numbers are a little off here, before my cage, my car weighed 2960 with MM full length subframes. After the MM subframes were removed, and the thru the floor subframes and 8pt 1 3/4" moly rollbar was put in the car tipped the scale at 2980. So id guess the bar weighs about 80 lbs max, thos MM subframes were heavy, but def nowhere near 100 lbs. Also, i ordered 100 sq feet of FatMat, which weighed 47 lbs and is 70mil thick, just slightlyh thicker than dynomat extreme which is 67mil. So you could get away with less than 40lbs of sound deadening because i highly dowbt that your going to use 100 sq ft of sound deadening in these cars.

Hushmat floor kits weigh about 30lbs, they say its enough to do the whole floor of the car but you cant, add another kit to finish the firewall and 1/4 panels and misc crevises and you're looking at 65-70lbs right there. IIRC those MM subframes were about 45-50lbs, and my DOM 8 point cage weighs about 110lbs, so i figure im pretty darn close

 

[90lxcoupe]

Hushmat floor kits weigh about 30lbs, they say its enough to do the whole floor of the car but you cant, add another kit to finish the firewall and 1/4 panels and misc crevises and you're looking at 65-70lbs right there. IIRC those MM subframes were about 45-50lbs, and my DOM 8 point cage weighs about 110lbs, so i figure im pretty darn close

id say this is a little closer, but the first post you said the bar was 120-150, which if your using moly its much lighter, and like i said, 100sq feet of fatmat weighs 47lbs, and theres no way the average guy is going to put more than that into his interior

 

[fiveohwblow]

Hushmat floor kits weigh about 30lbs, they say its enough to do the whole floor of the car but you cant, add another kit to finish the firewall and 1/4 panels and misc crevises and you're looking at 65-70lbs right there. IIRC those MM subframes were about 45-50lbs, and my DOM 8 point cage weighs about 110lbs, so i figure im pretty darn close

Ive got my full length MM subframes in the box next the car in the garage. Nothing over 40 lbs max... I could even look at the shipping label actually...