Just thought I'd document what I'm doing to the rear cargo area to tone down the TnG exhaust a bit in the cabin.
Removing the panels is pretty straight forward and once removed, you can see what the "Premium" package gets you in terms of deadening and insulation.
The bottom of the carpet has insulation attached, but only under the seating area. You can't see in this pic because the carpet is folded over the 2nd row seats, but the area which lays across the cargo space does not have any insulation on it at all.
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Also notice in the above pic the strips of material which were added to the sheet metal by the factory. This is what I would call "Constraint Layer Damping" material, or CLD. It's purpose is to stiffen the sheet metal and reduce the tendency of the panel to resonate. Tapping along the floor with my finger does produce a resonant ring still though, so some additional CLD would be beneficial here.
Looking at the sides, you can see the sound blocking materials which are added to the wheel wells. This is a layer of insulation to act as a decoupling layer, then topped with mass loaded vinyl for sound blocking. I believe this is part of the "Premium" package's additional insulation.
![Image]()
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The 1st step to this is to add some CLD to areas which resonate when tapped. So I added Second Skin's Damplifier product to the floor and to key areas in the corners. I basically tapped with my finger and where I heard resonance, I added some CLD. You don't need full coverage with CLD, as it is not sound blocking material, but it is meant to reduce the ability of a material from resonating. This is meant to stop noise by stopping resonating panels, not meant to stop sound waves themselves from passing through. Thus you just need to use enough to change the resonant frequency of the panel.
![Image]()
I also added it to a few key areas in the corners:
![Image]()
![Image]()
While I was investigating things, I noticed the rear HVAC duct work rattled quite a bit due to the way the pieces are joined. So I took some Second Skin Overkill product (ie: closed cell foam, or CCF), and cut strips of it to line the inside of the ducts where they connect together to create a tight fit. Then I also added CCF strips to the metal body panels where the plastic ducts touch it, and finally added some CLD pieces to the ducts themselves to stiffen it up.
Initially when I tapped on the duct work, it would not only resonate but also made plastic rattling sounds. Now it's a dull "thud" when tapping with no resonant ring or rattles. I'd think this will reduce the fan noise, but maybe not? I just figured since I was here and had the materials on hand, might as well address it.
![Image]()
I'm also looking for any places where objects may cause a rattle noise, and I'm adding CCF or butyl rope pieces to silence them. Here's an example ... this round piece is loosely connected to the panel and rattles quite a bit when tapping anywhere near it. So I added a piece of CCF to prevent any rattling .... BTW, anyone know what this cylinder thing is? It looks almost like a barometric pressure sensor
![Image]()
Next step is to add a layer of Mass Loaded Vinyl (MLV) with a bonded layer of CCF to the floor space. This is Second Skin's "Luxury Liner Pro" product. This is what will actually block sound waves directly, so it's important to cover as much of the floor as feasibly possible.
![Image]()
I'm hoping to tackle this sometime in the next day or two, as the wife really wants her interior back together
Removing the panels is pretty straight forward and once removed, you can see what the "Premium" package gets you in terms of deadening and insulation.
The bottom of the carpet has insulation attached, but only under the seating area. You can't see in this pic because the carpet is folded over the 2nd row seats, but the area which lays across the cargo space does not have any insulation on it at all.
Also notice in the above pic the strips of material which were added to the sheet metal by the factory. This is what I would call "Constraint Layer Damping" material, or CLD. It's purpose is to stiffen the sheet metal and reduce the tendency of the panel to resonate. Tapping along the floor with my finger does produce a resonant ring still though, so some additional CLD would be beneficial here.
Looking at the sides, you can see the sound blocking materials which are added to the wheel wells. This is a layer of insulation to act as a decoupling layer, then topped with mass loaded vinyl for sound blocking. I believe this is part of the "Premium" package's additional insulation.
The 1st step to this is to add some CLD to areas which resonate when tapped. So I added Second Skin's Damplifier product to the floor and to key areas in the corners. I basically tapped with my finger and where I heard resonance, I added some CLD. You don't need full coverage with CLD, as it is not sound blocking material, but it is meant to reduce the ability of a material from resonating. This is meant to stop noise by stopping resonating panels, not meant to stop sound waves themselves from passing through. Thus you just need to use enough to change the resonant frequency of the panel.
I also added it to a few key areas in the corners:
While I was investigating things, I noticed the rear HVAC duct work rattled quite a bit due to the way the pieces are joined. So I took some Second Skin Overkill product (ie: closed cell foam, or CCF), and cut strips of it to line the inside of the ducts where they connect together to create a tight fit. Then I also added CCF strips to the metal body panels where the plastic ducts touch it, and finally added some CLD pieces to the ducts themselves to stiffen it up.
Initially when I tapped on the duct work, it would not only resonate but also made plastic rattling sounds. Now it's a dull "thud" when tapping with no resonant ring or rattles. I'd think this will reduce the fan noise, but maybe not? I just figured since I was here and had the materials on hand, might as well address it.
I'm also looking for any places where objects may cause a rattle noise, and I'm adding CCF or butyl rope pieces to silence them. Here's an example ... this round piece is loosely connected to the panel and rattles quite a bit when tapping anywhere near it. So I added a piece of CCF to prevent any rattling .... BTW, anyone know what this cylinder thing is? It looks almost like a barometric pressure sensor
Next step is to add a layer of Mass Loaded Vinyl (MLV) with a bonded layer of CCF to the floor space. This is Second Skin's "Luxury Liner Pro" product. This is what will actually block sound waves directly, so it's important to cover as much of the floor as feasibly possible.
I'm hoping to tackle this sometime in the next day or two, as the wife really wants her interior back together
