2nd Gen Non-Engine/Transmission Soundproofing do's and don'ts?

[snowracer69]

Have my back seat out, and will be removing the rest of the interior probably at the end of next week. I want to soundproof everything! After 14 hours of non-stop driving (ok, one stop at the 6 hour point, but she never got shut down) my ears are ringing and I can't hear a dang thing!



Obviously the back wall of the cab needs done. Also am probably going to send off my compressor housing and have a TAG (hopefully a T2) installed for the quietness. Am planning on wrapping my downpipe w/ something (header tape?) to keep some noise in, and doing the passenger floor-board up w/ material to keep some more of that noise out.



How important are the doors for interior noise? What material is best to use? I can get Dynamat Extreme (the good stuff) for cheap from a stereo friend, and plan on putting down probably two layers everywhere! I'm tired of the inside noise! I don't care how loud it is outside, but inside is KILLING ME!!! Should I do the oil pan, and if so, with what?



Sorry for not using the search, but on a 14. 4k dialup connection, it would honestly take me days to find something.



Josh

 

[bmoeller]

Originally posted by snowracer69

but on a 14. 4k dialup connection

OUCH. I don't miss those days for anything.



I've been thinking about doing the same for the back wall. www.jcwhitney.com has some sound deadening stuff also.



This may help- https://www.turbodieselregister.com...p?s=&threadid=63647&highlight=sound+deadening

 

[snowracer69]

Thanks bmoeller... will look into that stuff.



Anybody else? You guys telling me there are absolutely no tricks to doing this, and that it's all straight forward? Nobody who's done this before has any helpful hints?



ttt one time



Josh

 

[gbm]

SnowRacer,



I know exactly what you are going through. I love the way our truck pulls the trailer, but after a long trip, my wife and I would be fatigued from the noise. So I set out on making the truck a little more noise friendly.



In January of 2001 I purchased a “full Set” of blankets covers from ATP (www.atpwrap.com) for the: Oil pan, Valve cover, Exhaust manifold, Turbocharger, Downpipe, and Hood liner. I had done some serious research into what was available, and was tremendously impressed with the quality of the ATP products. The quality of their products is Aerospace / Military. In 3 years of use, and over 60,000 miles, the ATP products on my truck are “like new” no problems or issues what so ever. These are expensive components, and they really work well.



If you are looking into really reducing the sound level in the cab of your truck, additional soundproofing can make a significant noise reduction. On my truck, I pulled the interior and put down a “Dyna-mat” type material on the floor and rear wall. I covered the “Dyna-mat” on the floor with a layer of 2 ½ pound per square foot lead. I glued CSI sound stop foam on the rear wall of the cab. I removed the door panels and glued 1” CSI foam on the inside of the door skins – all four (quad cab). I also covered the complete firewall on the engine side with CSI foam. I removed the headliner and glued foil faced “Jute” to the roof of the cab. I insulated the “cowl” –the box that the windshield wiper motor sits in with “Dyna-mat” and foam.

I wish that I had purchased a Db meter prior to starting this project. I did purchase a Db meter about half way through the project, and it really helped quantify some of the changes. Lead sheeting on the floor and CSI foam on the back wall were a couple of the best “return on investments” – from a time and cost of material standpoint. Covering the complete firewall with the CSI foam was difficult and time consuming, but I really liked the result.

At first, I was concerned about over-insulating the engine, and causing heat related problems with the oil etc. . This has not been the case at all, marine and generator versions of our engines see far more insulation and work much harder that our trucks without any airflow over the block.



Now when my wife and I travel, we can talk at a normal voice level. We feel less fatigue after a long day on the road. The stereo system seems to sound better now that we don’t have it turned up as loud. We have also noticed that much less heat gets transferred into the cab, from the floor, firewall, and roof.



The patron saint of noise reduction for our trucks is a man who goes by LSFarm. He has been amazingly helpful in my quest for a "quiet Cummins". Look for posts that he has made, and you will have some tremendous insight into noise reduction.



I know this was long, I hope it helps.

Geoff

 

[SteveE]

Soundproofing

Using dynamat you will need to Roll it down. Replace the pop rivit

in the roller with a small bolt and nut, your knuckles will thank you.

Make little doors for the vin numbers, don't cover those, you will see them.



The back panel made the biggest difference.



Make sure the exhaust is not pointing toward a part that could reflect sound.



Rip Rook has ridden in my truck and he thought it was really quiet.



Steve



https://www.turbodieselregister.com/user_gallery/sizeimage.php?&photoid=4678&width=4