The carpet has some jute backing behind the vertical wall, floors and trunk. That stuff looks to insulate sound better then dynamat or brown bread would. Any opinions on that? I have the brownbread and V comp on order but I dont see how it could do any better then that 3/8" jute backing could under the carpet. Anyway, here are my progress pics. It only took about an hour to an hour and a half to get to this step and all vacuumed out.





Dave

 

hehehehe....just looking at your pics and had a thought!

GM should have a reduced price option to deliver our Vettes only about 80% assembled. We buy 'em...and not too soon after take 'em apart again!

 

looks good dave. gonna do the same thing in 30years when my cars together again

 

yes, how does one tell the performance of a sound reduction material by its "looks"

there's two ways to reduce sound:

1. Absorbtion via thickness - the more sound absorbtion material between your ears and the offending sound producer... the better. Problem is, in an automobile cockpit, there is no room for added thickness. And it takes a lot of material to "absorb" sound. Just look at a top notch recording studio; they pour inches of asbrobition materials on the walls/ceilings... then add wavy type foam they is abotu 10 inches thick. But in that environment, they have the room (space) to do it that way.

2. Dampening of the vibrating surface. Add mass to a surface, and this inhibits the surfaces ability to vibrate/conduct sound from one side of it to the other.

the factory material is "thickness only" based. And not much can be accomplished with the minute amount of the factory material - when placed under carpeting. Hence... the reason you are wanting to further quiet the interior noise. The factory "thickness and absorbing" materials won't cut it - even if they're thickness were doubled.

"Dampening" on the other hand can be accomplished with very little added thickness. You take something with mass, bond it to a surface, and that surfaces ability to vibrate has diminished greatly.

The brownbread and V comp you mention work with the second method - dampening.

It's simple, you're comparing apples to oranges. These two types of materials (factory versus the brownbread and V comp) don't work the same way, so they can't be compared to each other using "visual" means.

TT_Vert; I just gotta ask... have you not read any of the multiple posts on this subject over the past couple of years?

the only suggestion I have is to make certain your brownbread and V comp produitsd don't contain any petroleum based fillers. I know that Evil-Twin has warned us numerous times about gas release problems from petroleum based products ... and the resultant "tar smell" they can create.

As you are already aware, yoru project will take more that just a few hours. Take yout time doing it; will be well worth your time.

 

i've read pretty much every post however im not sure what that has to do with anything. Ive read that the brownbread doesnt have any odors when it gets warm but there is only one way to tell. So by dampening sounds, will that effectively reduce road noise transmitted into the interior of the car?

Dave

 

also let me ask you this mike> Do you think i'd benefit any (sound reduction wise) by putting some Frost king over the brown bread in areas like the rear trunk vertical and side walls and stuff? Its much cheaper and I plan to use all the brownbread I purchased in the doors/first layer of floors. For the cost of the stuff if it'll help at all i'll use it as a second layer in all areas but the floors in cockpit, rear seating area and trunk floors. (I plan to lay V comp over the brownbread in those areas). Where do you think the most problem areas are for sound transmission on a c5??

Thanks
dave

 

Excellent mod...use a dampener first. Brown Bread or Dynamat Extreme work well to dampen the panels. Then add a sound barrier layer on top. VComp is an outstanding sound barrier layer. Frost King on top of the dampener would also work well. I have 1 layer of Dynamat and 1 layer of VComp, and I am very satisfied with the results.

Here's my B-Quiet VComp install pictures...(over Dynamat)...







Finish up with a Lloyd's Mat for the finishing touch...

 

i saw your post thats what gaveme the idea Did you have any problems getting any interior piece back on?

Dave

 

No problem at all...fit in easily. I left about 1/4 inch without VComp at the edge of the speaker housings, so the carpet could slide in ok.

 

the vert is a little differnt but ok. Did you double layer anything anywhere?

Dave

 

I didn't...but you could in the flat areas of the rear. I think the cockpit would be too tight to do a double layer.

 

i was hoping to get some v comp under the floorpans on both sides too. I might put some FK in too in vertical areas and on wheelwells behind the speakers etc.

dave

 

The VComp just lays on top of the dampener...if you had trouble with carpet/seat install...you could always pull it out.

If you could fit it in, it would help with sound reduction.

 

IMO, yes. But your best reduction would be using the most heaviest/dense material... which the Frost King is not the heaviest/most dense, and it won't be as effective as the others.

But when costs and weight become a factor, then this is where the FK becomes a viable product.

Also, if thin'ness is a serious factory iwith a particular install, the Reflextix material ET has worked with is thinner.

Lots of options... and that's always a good thing

 

WOW; I LIKE the looks of that LLoyds mat

does anyone knwo how much it weighs?

 

its not so much cost as product availability. I only ordered 100 sqft of the expensive brown bread. I dont know how far it'll go so I figured if i ran out and had places that just had free air behind them I could add a layer or two to quiet it down even more in that area. Do you know if one area transmits more sound then another?

Dave

 

I just did this mod to my coupe this weekend in preparation
for the stereo install next weekend. Im very happy with the results
much lest road noise/engine noise. The interior is so much quieter
I can now hear the ac fan on its lowest setting, where as before
It had to be on the highest setting for me to notice it.

The hardest part was dissasembling all the plastic trim, Ive got to
replace a few of the push-pins ( they work but they look mangled )
in the overhead trim.

I took a 50 mile drive after it was complete and even the heat from
the transmission is greatly reduced. Now soon as my Subthump
box arrives ill be ready to install my new stereo =).

 

Mike, the Lloyd's cargo mat weighed 8 pounds. Not too bad.

 

Has anyone tried a double layer of FK all around? Is it too thick to do that?

 

it just dawned on me that the weight is not important... as it can be easily removed just before a drive to the track.

Very interesting item.