Hey guys my CYM project is coming home on Wednesday, hopefully I'll reinstall the entire interior this weekend but I'm in need of some recommendations for sound insulation for the floor. Something like Dynamat or any other alternate suggestions.

I would like the stuff to be cheap, light and quiet but I know those things don't always go together.

Tell me what you've used before and how you liked it.

Pics of the project, the last page shows what it looked like today.

http://community.webshots.com/album/89560034SgoVwL

Thanks,
Jeff

 

silencer

 

If exhaust noice is what is going to bug you then you can do what I did. I got me some rolls of dynamat and just put it on the "storage area" from the divider to the back of the car all the way to where the hatch open at. dynamat is actually not expensive, you just get charged a lot because the labor involved. Just by how small our interior are it won't tkae much to cover it. 3 rolls of 18" x 32" runs you about $77.00. It took me about 1 1/2 rolls of dynamat to cover the trunk are alone. or before you put everything back together under the car get the spray stuff and spray the hell out of the bottom of the car.

 

I used Dynamat Extreme in my doors when I installed my component speakers. I put 2 layers on the outer door skin and one layer on the vertical frame portion of the door. The doors close very quietly now. If you knock on the doors, it sounds like you're knocking on concrete rather than aluminum. I purchased a bulk pack of the Dynamat Extreme and used about 7 sheets.

I would like to do what hondasr4kids is suggesting and Dynamat the rear hatch area and spray sound deadening under the car to kill some exhaust noise. RonKMiller had some good ideas regarding sound deadening. You should PM him.

 

I used the B-Quiet stuff and really like it:

http://www.b-quiet.com/extreme.html

Not as expensive as Dynamat, but works really well. I only did my doors about 2 years ago. I'm going to do the rear area to help drown out some exhaust noise this winter.

 

Mahjik,

Is B-quiet excessively smelly or sticky? I've heard that the other brands of sound deadening stuff tend to either be really messy to apply or will smell really bad if it gets hot.

 

Thanks for the tips guys.

What I'm trying to do is replicate the factory stuff on the interior floor. The entire floor was replaced with a new one and does not have any sound deadener on it.

 

Nope. It doesn't smell or anything. It's basically just like Dynamat except for it doesn't have the temperature rating to be used under the hood (and it's cheaper).

 

Anything that muffles sound is not going to be light. The principle of sound deadening is to stop vibrations, to do that you nead to add weight to flat panels. Dynamat or "brown bread" both work great for that... but they weigh a lot. Either of them are really wasy to install and not very messy.

 

lol, well, I'll say this.. The amount of B-Quiet I used on my doors, was about 1/10th the weight of my airpump.

 

I sprayed the inside door skins on each door and put ROADKILL on the inside panel. This worked great for me, but I thought the ROADKILL was a little pricey. My intention this winter is to do the same thing as Mahjik, using brownbread which is ALOT cheaper. I also thought about using some DIY bedliner stuff, at least where the spare tire well is.

 

I read many years ago about a material called "ensolite". It was a book written by an engineer about modifying Corvairs. Its supposedly used in corporate jet airplanes so its very light. He said it was a closed cell foam and was a fantastic sound deadener. Anyone here ever mess with this stuff. I have a phobia about adding weight into a light sportscar and would only like to add as little as possible. Price isint an issue to me as its a one time investment.

 

good, light, cheap........pick 2 =]

 

I used Roadkill on my last car. It is half the weight of Dynamat but costs a little more. Application is as easy as putting on a sticker and comes in huge rolls by the yard. Never had a problem with it coming off and worked extremely well. I needed it because I had 2 15'' MTX 8000's in my Civic hb and every panel would vibrate like no other.

 

I bought a roll of the stuff from the local Foam Mart (yes, that's the name). You can buy different thickness rolls/sheets, or simply laminate multiple pieces to make something thicker. The Foam Mart guy told me that it's common to use for sound deadening in car audio installations, and that it's also sometimes used to wrap wire harnesses (I think that he meant inside the cabin, to keep the harness from rattling).

Now, as to the effectiveness of ensoliite for sound insulation-- I have no freakin' idea I bought it to glue to the inside of my truck's cab, but never got around to doing the project. Still have the roll and the 3M spray adhesive in the garage.

Look in the local yellow pages under foam, and try to find one of these warehouse foam stores. They will have everything there. They also reek like every kind of nasty foam smell at the same time (it's gotta do some nasty things to the people that work there), so be prepared.