Help dynamat didn't work

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bigwise1

Member - Posts: 39

Joined: December 28, 2004

Posted: January 01, 2005 at 2:37 PM / IP Logged

I have a chrysler 300c with 2 JL 10w6v2's in a sealed enlosure firing towards rear w/ 1 zapco 500/1 going to each. Applied dynamat extreme to entire trunk and it still rattles bad. Should I apply another layer?

audiobass10

Silver - Posts: 328

Joined: October 11, 2004

Location: United States

Posted: January 01, 2005 at 2:45 PM / IP Logged

I'll tell you what I was told by a car audio shop owner. He orders dynamat for people who want their whole car done in it. He reccomended not to buy it because it's costly and doesn't look great. He told me to go to lowe's/home depot and get a can of "great stuff"..I believe it was called. It will run you about $5 and its basically a foam insulation that plumbers often use. You spray it into all of the wholes and spaces in your trunk and in 24 hours it hardens and supposedly takes all of the rattel out. I would assume most of it anyway. It will get rock hard and any excess you can scrape off with a razor blade and spray paint over it if you feel necessary.

Dave

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Teamrf

Gold - Posts: 1,031

Joined: January 13, 2004

Location: United States

Posted: January 01, 2005 at 3:08 PM / IP Logged

Find out where the rattle is coming from and then apply accordingly.

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biker8018

Copper - Posts: 46

Joined: November 23, 2004

Location: United States

Posted: January 01, 2005 at 3:17 PM / IP Logged

don't do this! Please.Great stuff gets rock hard. Then you will play it and it will begin to break apart.Now you have a mess of powder in your trunk as well as a surface that has to be recleaned. Does the trunk rattle or is it the lights. If you applied enough mat to the trunk area then the next step is to get some rubber "O" rings and some foam rubber with self adhesive on it.Remove the tail lights.Put some mat(Hushmat is great) to these exposed areas. Then put some foam over that. This will stop the plastic and metal from vibrating against each other.Now where these screw in, place an O ring on both sides and tighten it up. You may never get all the vibration noise but this should eliminate a lot.

bigwise1

Member - Posts: 39

Joined: December 28, 2004

Posted: January 01, 2005 at 3:27 PM / IP Logged

biker8018 wrote:

I'm out of town right now but from what I remember it was mainly the trunk because I could put all my weight on it and get it to stop. Good idea with the tail lights. I'll have to listen to those.

audiobass10

Silver - Posts: 328

Joined: October 11, 2004

Location: United States

Posted: January 01, 2005 at 4:28 PM / IP Logged

From what i've heard great stuff works good. Never heard of it breaking off before. Id say its worth a try. Might save you $100.

Dave

Pioneer Premier DEH-P660

15" Kicker CVR

Profile AP1000M

It's Loud

maaudio1

Copper - Posts: 50

Joined: November 14, 2004

Location: United States

Posted: January 01, 2005 at 4:30 PM / IP Logged

Is there anyway to adjust the hood latch? If you can adjust the latch to make a tighter close that could solve your problem.

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bigwise1

Member - Posts: 39

Joined: December 28, 2004

Posted: January 01, 2005 at 9:17 PM / IP Logged

maaudio1 wrote:

Is there anyway to adjust the hood latch? If you can adjust the latch to make a tighter close that could solve your problem.

i'll look into that.

biker8018

Copper - Posts: 46

Joined: November 23, 2004

Location: United States

Posted: January 01, 2005 at 9:17 PM / IP Logged

foam rubber,o rings and a little hushmat $25-$30 1 hour time. It can't hurt to try this for that much

Poormanq45

Silver - Posts: 597

Joined: October 27, 2004

Location: United States

Posted: January 01, 2005 at 9:51 PM / IP Logged

"don't do this! Please.Great stuff gets rock hard. Then you will play it and it will begin to break apart.Now you have a mess of powder in your trunk as well as a surface that has to be recleaned."

Wrong! Great Stuff a.k.a. Expanding Foam, does not break down as you suggest. It does not become "rock hard" either. It does work kind of good at stopping the metal/Plastic from resonating because it actually adhears to the surface and does not easily transmit vibrations.

Now, it is not a really good sound absorber either. The foam in "Great Stuff" is a closed cell material. For a material to be a good sound absorber it must have "open" cells it it. This allows places for the sound waves to cavitate and eventually "die-out"

Anyway, when using Great Stuff, only fill the area approximately 1/3 full because that stuff expands alot.

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