Cheap Soundproofing

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Mar 26, 2007 | 12:23 AM

zTrek

Thread Starter

Burning Brakes

Joined: Apr 2006

Posts: 940

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From: Surprise Arizona

Cheap Soundproofing

I bought a roll of fiberglass insulation, cut it down to size, and wrapped it up well in some lawn bags...then stuffed all three rear storage compartments with it. I topped that off with some poly-fill nu Foam that I bought at a crafts store. Let me tell you, the sound reduction is simply amazing. I thought wrapping the insulation might compromise its ability to attenuate noise/resonance...but it works wonderfully. And there's no loose fiberglass to be worried about. I think this arrangement does more to reduce resonance within the compartments than to block sound itself. The net effect is rather remarkable though. I have B&B PRT with x-pipe and eliminated at least 80% of the around town drone. It's almost too quiet, and I have considered removing some of the material to strike a more suiting balance. Just thought I would share my experience...

Mar 26, 2007 | 01:10 AM

z06Bigbird

Safety Car

Joined: Jan 2007

Posts: 4,300

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From: San Antonio Texas

There is my next mod.

Ed

Mar 26, 2007 | 02:11 AM

BATM4N

Le Mans Master

Joined: Feb 2006

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From: USA

There was a thread similiar to this last week with similiar results.

Mar 26, 2007 | 04:09 AM

FactoryRaceCar

Race Director

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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12

Mar 26, 2007 | 11:45 AM

ALLEGRO

Le Mans Master

Joined: Feb 2003

Posts: 6,683

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From: Memphis Tennessee

I will study this some more!

Mar 26, 2007 | 06:48 PM

berryj

Drifting

Joined: Mar 2003

Posts: 1,398

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From: Kingsport TN

That's interesting. I remember a similar post about this too. I have a vert and I have PRT's w/ that drone at 1600 rpm. I think I'll try this. What is the poly-fill nu foam? Is it something u cut and place in the bag w/ the insulation or place on top of the lawn bags? How many lawn bags per compartment? I have two small compartments on either side and the one big one in the middle. Not sure if all coupes and verts have the same rear size compartments.

Thanks for the tip!

Mar 26, 2007 | 06:51 PM

BUBBAS 01Z06

Melting Slicks

Joined: Oct 2006

Posts: 2,574

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From: Fredericton NB

Pics ??

Mar 26, 2007 | 06:54 PM

C5XTASY

Safety Car

Joined: Oct 2000

Posts: 4,949

Likes: 10

From: Monticello MN

Quote:

Originally Posted by captcruz

There was a thread similiar to this last week with similiar results.

This sounds extremely interesting. Does anyone have a link to last week's thead?

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Mar 26, 2007 | 07:26 PM

Oldvetter

Le Mans Master

Joined: Feb 2002

Posts: 6,937

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From: Waldorf MD

Quote:

Originally Posted by C5XTASY

This sounds extremely interesting. Does anyone have a link to last week's thead?

I think you might be refering to my thread, here it is:

http://forums.corvetteforum.com/show....php?t=1632147

Mar 26, 2007 | 08:11 PM

#10

DefenderC5

Melting Slicks

Joined: Oct 2006

Posts: 3,447

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From: Los Angeles

And people are still asking for pics in this thread too

Just stuff it in there!

Mar 26, 2007 | 09:42 PM

#11

Mike Mercury

Team Owner

Joined: Apr 2001

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From: S.W. Ohio. . . . . . NRA Life Member

Quote:

Originally Posted by Oldvetter

I think you might be refering to my thread, here it is:

http://forums.corvetteforum.com/show....php?t=1632147

that was a great discovery!

Last edited by Mike Mercury; Mar 26, 2007 at 10:38 PM.

Mar 26, 2007 | 09:44 PM

#12

Oldvetter

Le Mans Master

Joined: Feb 2002

Posts: 6,937

Likes: 21

From: Waldorf MD

Quote:

Originally Posted by Mike Mercury

thast was a great discovery!

Thank you, just deductive reasoning. "I have to give credit to Choreo's post about soundproofing, when he said that carrying a roll of fiberglass wall insulation home from the store reduced his car's noise, I got thinking."

Last edited by Oldvetter; Mar 26, 2007 at 09:46 PM.

Mar 29, 2007 | 08:39 PM

#13

C5XTASY

Safety Car

Joined: Oct 2000

Posts: 4,949

Likes: 10

From: Monticello MN

Don't think it would work on my car

Quote:

Originally Posted by Oldvetter

I believe my situation is different than a stock machine. The frequencies must be different. I have a coupe with H/C, longtubes w/high flow cats & X-pipe, GHL Bullet exhaust (6 inch mufflers), etc., and a Lloyd's cargo mat in the back. As an experiment I stuffed a pillow in each of the three compartments thinking that, at the very least, any frequency amplification would be negated, or changed, in those three locations. I couldn't really detect any difference, at any speed. I used to run with two comforters spread out in the rear for sound attenuation. When I purchased the cargo mat, sound attenuation was at least as good, with just that, as with the comforters. Stuffing those pillows into the compartments did nothing for me. I was hoping for some change, at least. I really don't want fiberglass in the car, and, after my experiment, don't think I'll be dropping $40.00 on foam to try that out. I sure was hoping...
Ed