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  #1  
Old 07-17-2022, 11:52 AM
SJTD SJTD is online now
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Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
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ACC Carpet Kit Mass Backing

Anyone with experience with or without? Comments?

I'm about to order the carpet kit. I already put the MLV on the firewall and was going to put it on the floor. Cheaper and thicker than the extra $200 for the carpet kit with it and the stuff on the carpet isn't as thick. No, I don't really want to use both.
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'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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  #2  
Old 07-17-2022, 06:45 PM
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Cliff Cliff is offline
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Location: Upper East Tennessee
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I carpeted my 77 Cherokee 3 years ago and did not use it. I used a layer of Dynamat and then a layer of Frost King as insulation. I have no complaints - definately quieter. Frost King is a Home Depot product - just basic foil lined bubble wrap for ductwork. It has a self adhesive side and lays easily. Many people use 2 layers of Dynamat but it's very heavy and the Frost King is super light.
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  #3  
Old 07-17-2022, 08:30 PM
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cu4whln cu4whln is offline
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Location: Canton, Mi USA !
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Well, I just ordered a kit WITH the mass backing.
Give me a month after it gets here and I will tell you.
I am more worried about getting it to lay down well than the cost.

My Cherokee is LOUD right now, or was before I took it apart.
Tons of tire/road noise.

I have added Hushmat and some Kilmat throughout the vehicle.
My goal is to get the beast as quiet as possible for a long road trip.
As in 4 to 5 weeks on the road, cross country.
Noise makes you tired over time, I want to be sharp for this drive!

My thoughts are this -

Any thickness of material can, and will absorb and dampen sound.
Mass Backing will help the noise.
How much? I don't know, but this is a proven method over many years, by many manufacturers.
So I am adding as much sound treatment as possible.

My Yellow Madness build?
Was super quiet on the road.. except for wind noise above 70 mph.
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1977 "401" 'Da Chief
1979 Chero: "Madness" [Sold]
1985 CJ : Renegade -locked and loaded
2005 Unlimited Rubicon - Built
2001 XJ : Driver - 2016 JK 2 door

'Da Chief here: http://www.ifsja.org/forums/vb/showt...ighlight=chief

Round 2- LT Swap: 'Da Chief:
http://www.ifsja.org/forums/vb/showthread.php?t=188457

"Madness" build here:
http://www.ifsja.org/forums/vb/showthread.php?t=89280
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  #4  
Old 07-17-2022, 09:14 PM
SJTD SJTD is online now
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Location: Lompoc and Sunland, CA
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I'm thinking I'll spend that extra $200 on foam and 1/8" MLV like I did on the firewall. The backing on the carpet is only .04". I've already got some butyl to continue limited coverage on the floor under the foam. Hopefully I have enough to do the door skins too. I'll buy it for that id I have to.

I'm not sure what I'll put in the corrugations in the bed. Maybe the MLV I don't know if I've got enough butyl. Maybe buy some more. That would be best. Also thinking about filling it with more bedliner. Have to do some computering to see what that would cost.
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'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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  #5  
Old 07-17-2022, 11:03 PM
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babywag babywag is offline
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I'd spring for the mass backing.
Without it the carpet is ridiculously thin and huge difference in noise.
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88 GW, 67 J3000, 07 Magnum SRT8
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  #6  
Old 07-18-2022, 06:35 AM
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cu4whln cu4whln is offline
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Location: Canton, Mi USA !
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As for sound deading material..

FYI - Amazon prices

Hushmat was about $200 for 36 sq ft when I bought it.
I feel this is a very good product and used it in what I consider critical areas.

Kilmat is $65 for 36 sq ft. I used this on the roof, and other fill in areas.

I am not using the rear original rubber underlayment mats btw...
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It's not yours 'til ya bleed on it . . .

1977 "401" 'Da Chief
1979 Chero: "Madness" [Sold]
1985 CJ : Renegade -locked and loaded
2005 Unlimited Rubicon - Built
2001 XJ : Driver - 2016 JK 2 door

'Da Chief here: http://www.ifsja.org/forums/vb/showt...ighlight=chief

Round 2- LT Swap: 'Da Chief:
http://www.ifsja.org/forums/vb/showthread.php?t=188457

"Madness" build here:
http://www.ifsja.org/forums/vb/showthread.php?t=89280
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  #7  
Old 07-18-2022, 07:27 AM
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bkilby bkilby is offline
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Location: Burbank Ca.
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Quote:
Originally Posted by cu4whln
As for sound deading material..

FYI - Amazon prices
Hushmat was about $200 for 36 sq ft when I bought it.




Hushmat in bulk. https://www.amazon.com/HushMat-10500.../dp/B001VKO8WE
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  #8  
Old 07-18-2022, 08:18 AM
MysticRob MysticRob is offline
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Join Date: Nov 26, 2019
Location: Sierra Vista, AZ
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I used the mass backing and was happy with how it laid, and I can't imagine it not having helped with noise, though I also used Kilmat in stategic areas to avoid that hollow and metallic tingy noise, especially up front and in the front doors.
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--Rob--
1988 Jeep Grand Wagoneer / Baltic Blue & Tan
2008 BMW 535xi Wagon / Deep Sea Blue & Tan

My build thread:
https://ifsja.org/forums/vb/showthread.php?t=189245
My Howell TBI Install How-To:
https://ifsja.org/forums/vb/showthread.php?t=189877
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  #9  
Old 07-18-2022, 11:30 AM
SJTD SJTD is online now
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Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
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Comparing Hushmat or other butyl mats with MLV or the mass backing is invalid. They're for different purposes.

To be most effective the sound barrier should be isolated from the metal with a layer of padding. Used like this there's no reason to use butyl which is more expensive than MLV.

Butyl is best used directly on the metal for vibration. When in direct contact with the metal it looses effectiveness as a sound barrier.

Even Dynamat caught on to this and offers their own MLV sheeting.


I don't dispute the effectivity of the backing, I just think the money could be spent on more effective material. The improved shape holding ability might convince me.

Did the padding come separate or attached? Just read it's included.
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'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.

Last edited by SJTD : 07-18-2022 at 11:37 AM.
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  #10  
Old 07-19-2022, 10:39 AM
SJTD SJTD is online now
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Location: Lompoc and Sunland, CA
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Ordered it with the backing. I'll prolly add MLV over the tunnel only.
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'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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  #11  
Old 07-19-2022, 12:30 PM
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cu4whln cu4whln is offline
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Location: Canton, Mi USA !
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Quote:
Originally Posted by SJTD
Ordered it with the backing. I'll prolly add MLV over the tunnel only.

Nice.

I would still cover the floor, but that's just me.

Let us know how it works out.

Here's where I am right now.

[IMG]http://[/IMG]

[IMG]http://[/IMG]

[IMG]http://[/IMG]
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It's not yours 'til ya bleed on it . . .

1977 "401" 'Da Chief
1979 Chero: "Madness" [Sold]
1985 CJ : Renegade -locked and loaded
2005 Unlimited Rubicon - Built
2001 XJ : Driver - 2016 JK 2 door

'Da Chief here: http://www.ifsja.org/forums/vb/showt...ighlight=chief

Round 2- LT Swap: 'Da Chief:
http://www.ifsja.org/forums/vb/showthread.php?t=188457

"Madness" build here:
http://www.ifsja.org/forums/vb/showthread.php?t=89280
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  #12  
Old 07-19-2022, 12:32 PM
SJTD SJTD is online now
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Good idea on filling the corrugations in the bed. Are they now flush?
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Sic friatur crustulum

'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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  #13  
Old 07-19-2022, 10:07 PM
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cu4whln cu4whln is offline
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Location: Canton, Mi USA !
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Quote:
Originally Posted by SJTD
Good idea on filling the corrugations in the bed. Are they now flush?

Not quite. I might fill them IF I have extra mastic left. The KilMat is pretty affordable.
__________________
It's not yours 'til ya bleed on it . . .

1977 "401" 'Da Chief
1979 Chero: "Madness" [Sold]
1985 CJ : Renegade -locked and loaded
2005 Unlimited Rubicon - Built
2001 XJ : Driver - 2016 JK 2 door

'Da Chief here: http://www.ifsja.org/forums/vb/showt...ighlight=chief

Round 2- LT Swap: 'Da Chief:
http://www.ifsja.org/forums/vb/showthread.php?t=188457

"Madness" build here:
http://www.ifsja.org/forums/vb/showthread.php?t=89280
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  #14  
Old 07-19-2022, 10:23 PM
SJTD SJTD is online now
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Location: Lompoc and Sunland, CA
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I was looking at filling them with Durabak but my computering said it would take a couple gallons. Too spensive. Wish I could find one of those early rubber mats that fit down into them and was flat on top. Mine came with strips of "hardboard" stapled to the full top layer. Two or three in each groove.
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'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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  #15  
Old 07-20-2022, 05:27 AM
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cu4whln cu4whln is offline
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Location: Canton, Mi USA !
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Quote:
Originally Posted by SJTD
I was looking at filling them with Durabak but my computering said it would take a couple gallons. Too spensive. Wish I could find one of those early rubber mats that fit down into them and was flat on top. Mine came with strips of "hardboard" stapled to the full top layer. Two or three in each groove.

Dang.. too bad. I have them.
I would give you my rubber mat. BUT - it would be way too expensive and a hassle to ship it. Especially these days.
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It's not yours 'til ya bleed on it . . .

1977 "401" 'Da Chief
1979 Chero: "Madness" [Sold]
1985 CJ : Renegade -locked and loaded
2005 Unlimited Rubicon - Built
2001 XJ : Driver - 2016 JK 2 door

'Da Chief here: http://www.ifsja.org/forums/vb/showt...ighlight=chief

Round 2- LT Swap: 'Da Chief:
http://www.ifsja.org/forums/vb/showthread.php?t=188457

"Madness" build here:
http://www.ifsja.org/forums/vb/showthread.php?t=89280
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  #16  
Old 07-22-2022, 08:15 AM
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rang-a-stang rang-a-stang is offline
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Something to consider, also, when you get the mass backing (mine also had it), the carpet does not quite lay the same. The extra bulk can make it a little hard to match the floor contours. I had trouble around the gas pedal, where the A/C comes down around the trans hump, and, if the passenger was a driver, where thier gas pedal would be.

I also noticed in places where things bolted down (transfer case shifter, seats, etc.) the extra bulk had a tendency to cause the carper to pucker of your torqued the bolt down.

I am NOT saying don't get mass backing, just expect it to take a little extra fenagling to install.
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  #17  
Old 07-22-2022, 09:07 PM
jeepman42 jeepman42 is offline
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Join Date: Mar 13, 2019
Location: porter tx.
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Talking Mass backing

Agree w Rang about fit issues w extra thickness.
ordered my ACCs wo mass.. used 1/4" felt w alum cover & reused orig felt in tranny area & rear wheel wells glueing it to carpet.
resist temptation to add too much thickness as it will be tough to reattach seat bolts , seat belts,door plates & any thing else reattaching to floor incl. rear area chrome strips if going back stock.
I used my junk yard dog attitude to install.LOL
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  #18  
Old 07-24-2022, 07:06 AM
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chubbinius chubbinius is offline
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Location: San Diego
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I used the ACC Essex set with mass backing (bought from BJs) on mine. Combined with kilmat and the jute and backing it really quieted it down. Of course then I could hear all the wi s from the old weatherstripping around the doors and their windows, doh!

I found it pretty easy to get in. I left it backing side up in the sun on a hot day to soften up and it matched contours pretty well. Those that needed any persuasion were coerced with just a little bit of heat gun on low. Good luck.
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