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Old 10-02-2002, 12:50 PM   #1
topcover
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Question Reducing Exhaust Noise in Cabin

Just put in a new exhaust and although the sound outside of the car is certainly not as loud as many on the market, doesn't call a lot of attention to my car and most importantly I like it!

I do NOT want to put a silencer on my exhaust or hack it in any way.


The noise inside my wagon however is a bit louder than my wife would like. The low end drone takes a bit getting used to.

Wanted to know your opinions and feedback on:

1) the use of sound dampening material (i.e., Dynomat Extreme) in the doors and floor of the the trunk space as an effective way to reduce noise

2) Besides those places I mentioned, where else should I use the material in the car

I'd like to hear the opinions especially from all of the audiophiles with performance exhaust. I figure you would know most about the best method to get the most out of your audio AND performance.

Thanks ahead of time!
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Old 10-02-2002, 01:06 PM   #2
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I'd concentrate on the floor of the trunk and the floor in front of the back seat simply because this is where the noise should be most prominent. I suppose you could try using an SPL meter to verify this is the case, someone probably has one they'd let you borrow for a couple days.

Materials you should be looking at should at the very least have a thin sheet of aluminum. Ideally you'd want lead bonded to the damping material. It's not as ridiculous as it sounds, thin sheets of lead are flexible and not THAT heavy (~1 pound per sq foot). McMaster-Carr sells them for sound BARRIER purposes. After all, it's much more effective to not let the sound in in the first place than it is to damp it once it gets into the car.

Constraining it to damping material will be even more effective. Sound must travel through the damping material, then gets reflected by the lead sheet back into the damping material again.

If you go with an off the shelf product, try to get one with as thick of a barrier layer as possible. Think reflection rather than absorbtion.
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Old 10-02-2002, 09:42 PM   #3
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What about the general reduction of cabin noise? is there a way taht one could fill the head liner? would it help
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Old 10-03-2002, 12:09 AM   #4
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What kind of exhaust did you put on? I HAD a Borla. Its not on the car because of the droning it produced. Another guy had the Borla and installed a different muffler, some type of race muffler, and it disappeared. I yanked mine off and went with a Prodrive muffler. It was neat being loud but it got old after a while.
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Old 10-03-2002, 12:16 AM   #5
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I am going to use RaamMAt on my car this weekend. Check out this link of several people who have already use sound deading materials in there cars.

http://forums.nasioc.com/forums/show...hreadid=208027


Jland
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Old 10-03-2002, 12:45 AM   #6
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man that stuff gets heavy if you do it how i used to do it for car audio...

I know firewall, floor board, and trunk areas make a hug difference.
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Old 10-03-2002, 12:49 AM   #7
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Hey, he has a Vishnu Stage 2. Wonder if he has bell-mouth downpipe and twin tip muffler or signature downpipe with single tip? Wonder if the drone would be as apparent in a sedan?

Lee
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Old 10-03-2002, 01:31 AM   #8
topcover
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The exhaust is the Vishnu non-signature exhaust. It is a beautiful piece of work and the noise outside is not loud. Let me lay out some other parameters.

1) Not loud on the outside.

2) Other i-club members especially the younger ones don't consider it loud.

3) The biggest complaint is coming from MY WIFE. For those of you who are married you understand.

Actually a day after the install, I'm getting used to it. (note: "I'm getting used to it") Just wanted some options.

QUESTIONS:

1) Should I start with the trunk, rear floor boards and work my way toward the front and check as I go?

2) Besides me doing this myself. Would reputable car audio places be able to do this work?

Last edited by topcover; 10-03-2002 at 01:39 AM.
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Old 10-03-2002, 01:35 AM   #9
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yes, but you shoudl do it yourself. Most installers assume you won't be pulling your carpet.. and won't take the time to do it right.

If you don't heat it up and apply correctly... it will not dampen as well as it can.

It's been awhile, and there amy be tons of new stuff since I was an installer... but back when i was installing, Super Dynamat was the bomb. I would use a few layers of that, then use the dampening spray over it.

That was before i cared about weight though...
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Old 10-03-2002, 02:31 AM   #10
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well... i guess you should try lining the trunk first to see if that is acceptable by the wifey. lining the firewall and floorboard would require WAAY too much work! another idea might be to line the hood?
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Old 10-03-2002, 09:53 AM   #11
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I would go another route. Add a resonator. This will quiet it down quite a bit without hurting performance or messing up your car.

Greg
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Old 10-03-2002, 01:09 PM   #12
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Quote:
Originally posted by TurboRex
I would go another route. Add a resonator. This will quiet it down quite a bit without hurting performance or messing up your car.

Greg
Greg -

Believe it or not... it already has a resonator!
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Old 10-03-2002, 01:17 PM   #13
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give it 2 weeks, ur wife will get use to it.
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Old 10-03-2002, 02:10 PM   #14
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Add another one! I have one resonators and two mufflers. The sound is still noticeable but adding the second muffler (looks like a resonator) made my wife comment on how much quieter it was.

Greg
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Old 10-03-2002, 02:33 PM   #15
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Quote:
Originally posted by TurboRex
I would go another route. Add a resonator. This will quiet it down quite a bit without hurting performance or messing up your car.

Greg
thats the best thing to do, but he doesnt wanna hack his exhaust up to add another.
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Old 10-03-2002, 02:44 PM   #16
TurboRex
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Yeah, I know what you mean. I hated doing it to mine since it was a nice turbo back exhaust system. However, I think it is a better flowing exhaust now and quieter as well.

Greg
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Old 10-03-2002, 07:14 PM   #17
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I have had great results with this stuff in my previous car:

Cascade Audio Engineering VB-1X spray

Really easy to apply (just spray it on and let dry) and it does a good job of damping exhaust and road noise. No messing around with heavy Dynamat sheets.

-Jeff
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Old 10-03-2002, 08:06 PM   #18
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Stan,

Remove your VS-2 and return it to stock. Then you can sell the setup to me cheap!
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Old 10-04-2002, 12:28 AM   #19
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Stan,

Get some ear plugs!!!! lol

Calvin
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Old 10-04-2002, 12:52 AM   #20
topcover
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Yeah... I'm gonna go ahead and wait a few weeks and see if we don't get used to it. I'm already there. My 6 y/o thinks its kinda cool and my wife after three days is still undecided.

If by that time she's still not used to it, I think I'll go ahead and buy a roll of RaamMat that Jland suggested and start on the floor of the trunk and work forward.

If that doesn't work, I think I'll go ahead and talk to my lawyer about getting the divorce papers drawn up.
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Old 10-04-2002, 12:12 PM   #21
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Quote:
Originally posted by prodrive121
What about the general reduction of cabin noise? is there a way taht one could fill the head liner? would it help

Its best to stop the noise at its source.

There's not much you can do to the stock headliner to absorb more interior noise.

Brian
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Old 10-04-2002, 01:27 PM   #22
thrashvr6
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Quote:
Originally posted by bcristea



Its best to stop the noise at its source.

Yeah, have you considered sticking a sock in your wife's mouth?








(If my wife sees this I'm dead..)
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