2nd Gen Non-Engine/Transmission sound proofing results

[jkidd]

Read up on a few sound proofing projects. was wondering if anyone had any real # readings in DBA before I go through and redo mine.



I currently have 74 DBA at 65mph and was wanting to reduce that by soundproofing the cab.



if you have done anything and don't have before readings, please post the readings on your finished product.



Please post idle and at cruising speed inside the cab.



If you have done exterior/engine compartment please post these results as well.



If no one has these numbers I will do the project and take results.





Planning project with use of some lead, Mass loaded vinly, butyl asphalt(dynomat/ or seal and peel) and some foam.



Thanks

 

[Allnew2Me]

I applied Lowe's Peel-n-seal on the back wall of the cab a while back. It is an aluminum/bituthane combo that is around $14 a roll. I used two layers on the back wall in opposite directions. I only checked the Db level after because I borrowed a meter and on the freeway it was 68-70 depending on where the reading was taken. It really cut down the resonanace in the cab and cut out the road noise. The back wall is like a drum, if you rap it with your knuckles it rings, but now it is dead quiet. I have plans to to the entire floor also.

 

[HookMeUp]

I did the entire truck floor and back of the cab with the peel-n-seal from Lowe's. Don't know what the db reading is, but made a huge difference in how quiet it is inside the cab. I can now carry and a conversation in a normal voice. I going to finish it out by doing the rear cab corners and the rear doors. I also read somewhere that if you line the inside of the cowl area under the windshield it will also make a difference.

 

[jkidd]

thanks for the info. I hope to hear more. hope to start my project in a month

 

[Boondocker]

Search on "Noise Reduction". There are some great threads from a few years back, hopefully still available.

Noise reduction easily rates in the top-10 best mods. I've had the complete interior (except headliner) out of my truck at least twice, and some parts three times. It's kind of like power, once you get some, you want some more Morale of story - don't skimp. While you have easy access to the surfaces in question, apply as much sound proofing as you can.

I don't have a DB meter, so no empirical data. I used QuietCoat, a visciolastic polymer (spray on) instead of the more traditional mat. It's all good. It's just that with the spray, I was able to get into nooks and crannies and places I couldn't reach with mat. In addition to the interior, I did the inner fender wells, under the hood (no blanket), parts of the cowl, and the oil pan. The truck has not lost any of its Cummins 24 Valve aural character, but the reduction of a few decibels is money in your hearing bank.

The non-scientific results are - stock stereo sounds much better, not as fatigued after a long drive - especially towing when RPMs are in the drone zone, I can comfortably carry on conversations with my family while driving.

Good luck, it's a good project.

Neil

 

[jeepit]

Neil, Where did you get the QuietCoat form?

 

[tony597fitter]

I, sorry my Wife and I just got done with my 97 ext. cab. I used a product from Menards called protecto-seal. Its a butyl based window sealer/flashing. It comes in 4" and 9" rolls.

We did the whole inside of the truck with 3 layers, floors, roof, doors, rear cab, everything. When we were doing that I got some expanding foam and sprayed that in all of the hollows on the floor.

We then bought some unfaced fiberglass insulation and garbage bags. I cut the into 16"x6" chunks and wrapped them in the garbage bags and spray adhesived them shut. We put these fiberglass batts in the hollows in the back (under the side windows). These trucks actually came with this from the factory, but not enough.

Then, we took a garage door insulation (looks like a windshield sun blocker, but in a roll). Its looks like reflective bubble wrap but is only about 1/4" thick. You can get rolls of it at Menards in 16", 24", and 48". I then put that stuff over the protecto-seal with 3m super strength spray adhesive and used a formica roller to seal it in. I put this stuff everywhere the protecto-seal was, floor, roof, back cab, everywhere.



Then I put a new headliner in and new carpet with a 40oz. padding attached to it. I then put the whole interior back together.



I loaded the whole family up and as soon as we started it my wife and I both said WOW! It feels like a whole different truck. My 3year old daughter even said that we can now talk in it (before she used to tell me "Dad, we can talk in Mommys car")



This was probably one of the best mods I have done to the truck.

 

[jkidd]

Mass loaded vinyl is supposed to be as good as lead sheet.

Still looking for something that will work on the following:

valve cover and oil pan
cowl area


any suggestions?

 

[jandtjil]

Dodge Cummins Diesel Truck Kit - Consumer Trucks Division of Advanced Thermal Products, Inc.

 

[Boondocker]

QuietCoat

Neil, Where did you get the QuietCoat form?

You're not gonna believe this - QuietCoat.com - :-laf

 

[DShore]

Try LizardSkin. They have a spray-on sound deadener and a spray-on heat blocker that is made out of some type of ceramic material. Just Google LizardSkin. They are in Lake Havasu City, AZ.

 

[brn2fsh]

Hello,



I used the Advance Thermal Products Quiet Kit on my 97. It made a significant difference in noise levels both in the cab and outside of the truck. I don't have meter readings to tell you exactly how much difference it made but the kit is worth the dollars in my opinion.



Scott

 

[jeepit]

You're not gonna believe this - QuietCoat.com - :-laf

How much would you estimate I will need just to do the interior?

 

[FLynes]

If you want the best sound deadener, their website recommends about 8 gallons.

 

[jkidd]

finally finished the inside. I have not got decibel measurements yet. I put a layer of rolled lead on the floor with 1/2" foam on the passenger side and 1/4" on the driver side.



I would definitely recommend putting something on the back wall, as there is no insulation there and the rear seat is easy to remove.



I can tell it is quieter.

 

[hilda]

I did mine last month

Quiet as can be, and No muffler or CC with 3" exhaust. I'm going to a 4" MBRP with muffler soon.



Hilda

 

[MAllen]

that looks nice,how much money in materials would you estimate?

 

[hilda]

dynamat Extreme

that looks nice,how much money in materials would you estimate?

If you shop EBay you can pick up the dynamat Extreme for about $125. 00 per box which is 36 square ft. I think I used a box and a half. I also replace the carpet while I was at it, also from EBay.



Hilda

 

[litespeed]

There is a product called PhatMat that is essentially the same thing for quite a bit less. A lot of the audio guys around here use it.



Also... I had a good friend of mine Rhino Line his entire interior floor, interior back of the cab, interior door skins and inside the bed. The difference was amazing. All of the "body drumming" and resonance is gone, the doors close with a thud and it is damn near silent going down the road. I plan to do some thing similar when I get my new dually.



I'm going to look into the QuietCoat. I would like to ride in a vehicle that has it.

 

[kxhonda]

Check out my gallery, kxhonda Gallery - Dodge Diesel, Diesel Truck Resource Galleries.



I've got 120 sqft of eDead from Elemental Designs. Its pretty cheap and they use butyl rubber now instead of asphalt so it won't stink and it sticks good during the summer heat.



It made a huge difference, but I have it pretty much everywhere possible. All together it added about 90 extra pounds of weight. I'm satisfied.