Attention: TDR Forum Junkies 
Howdy all,
I had been following Greg Long (Lsfarm) and others into the sound suppression efforts last year on my truck. After many, many emails with Greg, I decided on the SoundStop Superfoam from the awesome folks at Great Southern Insulation in Ft. Lauderdale, FL. I put a layer of the 1/2" Soundstop foam on the floor of the cab, 2 layers on the rear wall, and a layer on the panels of all 4 doors. It made a significant difference, but I still had the dreaded exhaust drone in the cab between 2000 - 2300 RPM.
Well, I recently decided to see what else I could do to quiet the drone. I went back and searched through Greg's, and other threads on sound reduction, and I remember Greg had commented that one of, if not the most significant item to attack, other than the rear cab wall, is the oil pan.
So, I called GSI, talked with Don, explained I had already used several sheets of their 1/2" foam, and now was looking to do more. He recommended another of their products, and I thought he said it was fairly new, but I may have misunderstood him. Anyway, it is a Dynamat like sheeting, not really asphalt, but close to it, with self adhesive backing. It's about 1/8" thick, and quite pliable. He suggested I put a layer of that on any metal surface, and then glue the foam on top of that.
Ok, so I ordered a couple more sheets of foam and 4 sheets of the [new] stuff, I forgot it's exact name. This new stuff is simply awesome
. Lay it on the sidewalk in the sun for an hour, it becomes very pliable and easy to work with. I cut pieces to fit the oil pan, and stuck them on. I let them sit for an hour or so, while I removed my back seat again and then removed the original foam I had glued to the rear cab wall. Turns out, I hadn't done a very good job, and that foam came out easily... So, I next put not one, but TWO layers of the asphalt like sheeting on the rear wall.
I then went back to the oil pan and glued a layer of the Superfoam on top of the asphalt sheeting. As per Greg's previous suggestions, I safety wired that all in place, just to be safe. I then went back and re-glued my original 2 layers of the foam on top of the 2 layers of the asphalt sheeting on the rear cab wall, reinstalled the rear seats, etc. .
I still had enough of the asphalt sheeting to do both main doors. I ran out of new "christmas tree" door panel fasteners, so I was only able to finish the passengers main door. Originally, I had glued the foam not to the actual doors, but to the backs of the plastic door panels. Not entirely sure how much, if any good that really did... So this time, I put a layer of this asphalt sheeting on the outside and inside portions of the passengers main door. Basically, covered every thing I could reach with a layer of the asphalt sheeting. I meant to also put a layer of foam on top of that, but forgot to...
Ok, so bottom line... According to my girlfriend and my own ears, even though the exhaust drone is still there, it is VERY MUCH reduced, and the entire cab is very noticeably quieter now. I fully intend to get more door panel clips and finish the drivers main door, and possibly get more asphalt sheeting and do the quad cab doors as well.
I just now ordered 2 rolls of the GSI fiberglass exhaust header wrap tape, and will be covering as much of my exhaust pipe as I possibly can.
I wanted to point out that Greg Long has worked a discount with the great folks at GSI as long as you specifically tell them you are a TDR or Turbo Diesel Register member. They don't ask for your member number, just make sure you tell them you heard about them on the TDR and you get the discount. Going from my oh-so-perfect memory of the shipping invoice of my recent order, I think it was either 20 or 30% discount on the SuperFoam, and either 10 or 20% on the asphalt sheeting.
I know Greg and several other folks had been gluing lead sheeting to the truck metal surfaces and then using the Foam, but this asphalt sheeting is so much easier to use, self sticking and non-toxic, and I am sure is about the same price if not cheaper than the lead sheeting... it is an awesome product.
Just in case you hadn't seen my earlier threads on sound suppression, to answer the $64,000 question: Why are you spending so much money on this quest? A: To kill the exhaust drone in the cab, basically. Next Q: So why not put a muffler back on the truck? A: No Way!!!!!! Yes, I had no drone when I had a muffler, but I also didn't have anything like the sound that comes out of the pipe without a muffler, and I am not gonna go back. Am not, am not, am not!!!
I put this thread up for anyone who might now be interested in sound suppression, and to let everyone know of this new?? product offering from GSI.
Tom
I had been following Greg Long (Lsfarm) and others into the sound suppression efforts last year on my truck. After many, many emails with Greg, I decided on the SoundStop Superfoam from the awesome folks at Great Southern Insulation in Ft. Lauderdale, FL. I put a layer of the 1/2" Soundstop foam on the floor of the cab, 2 layers on the rear wall, and a layer on the panels of all 4 doors. It made a significant difference, but I still had the dreaded exhaust drone in the cab between 2000 - 2300 RPM.
Well, I recently decided to see what else I could do to quiet the drone. I went back and searched through Greg's, and other threads on sound reduction, and I remember Greg had commented that one of, if not the most significant item to attack, other than the rear cab wall, is the oil pan.
So, I called GSI, talked with Don, explained I had already used several sheets of their 1/2" foam, and now was looking to do more. He recommended another of their products, and I thought he said it was fairly new, but I may have misunderstood him. Anyway, it is a Dynamat like sheeting, not really asphalt, but close to it, with self adhesive backing. It's about 1/8" thick, and quite pliable. He suggested I put a layer of that on any metal surface, and then glue the foam on top of that.
Ok, so I ordered a couple more sheets of foam and 4 sheets of the [new] stuff, I forgot it's exact name. This new stuff is simply awesome
. Lay it on the sidewalk in the sun for an hour, it becomes very pliable and easy to work with. I cut pieces to fit the oil pan, and stuck them on. I let them sit for an hour or so, while I removed my back seat again and then removed the original foam I had glued to the rear cab wall. Turns out, I hadn't done a very good job, and that foam came out easily... So, I next put not one, but TWO layers of the asphalt like sheeting on the rear wall. I then went back to the oil pan and glued a layer of the Superfoam on top of the asphalt sheeting. As per Greg's previous suggestions, I safety wired that all in place, just to be safe. I then went back and re-glued my original 2 layers of the foam on top of the 2 layers of the asphalt sheeting on the rear cab wall, reinstalled the rear seats, etc. .
I still had enough of the asphalt sheeting to do both main doors. I ran out of new "christmas tree" door panel fasteners, so I was only able to finish the passengers main door. Originally, I had glued the foam not to the actual doors, but to the backs of the plastic door panels. Not entirely sure how much, if any good that really did... So this time, I put a layer of this asphalt sheeting on the outside and inside portions of the passengers main door. Basically, covered every thing I could reach with a layer of the asphalt sheeting. I meant to also put a layer of foam on top of that, but forgot to...
Ok, so bottom line... According to my girlfriend and my own ears, even though the exhaust drone is still there, it is VERY MUCH reduced, and the entire cab is very noticeably quieter now. I fully intend to get more door panel clips and finish the drivers main door, and possibly get more asphalt sheeting and do the quad cab doors as well.
I just now ordered 2 rolls of the GSI fiberglass exhaust header wrap tape, and will be covering as much of my exhaust pipe as I possibly can.
I wanted to point out that Greg Long has worked a discount with the great folks at GSI as long as you specifically tell them you are a TDR or Turbo Diesel Register member. They don't ask for your member number, just make sure you tell them you heard about them on the TDR and you get the discount. Going from my oh-so-perfect memory of the shipping invoice of my recent order, I think it was either 20 or 30% discount on the SuperFoam, and either 10 or 20% on the asphalt sheeting.
I know Greg and several other folks had been gluing lead sheeting to the truck metal surfaces and then using the Foam, but this asphalt sheeting is so much easier to use, self sticking and non-toxic, and I am sure is about the same price if not cheaper than the lead sheeting... it is an awesome product.
Just in case you hadn't seen my earlier threads on sound suppression, to answer the $64,000 question: Why are you spending so much money on this quest? A: To kill the exhaust drone in the cab, basically. Next Q: So why not put a muffler back on the truck? A: No Way!!!!!! Yes, I had no drone when I had a muffler, but I also didn't have anything like the
sound that comes out of the pipe without a muffler, and I am not gonna go back. Am not, am not, am not!!! I put this thread up for anyone who might now be interested in sound suppression, and to let everyone know of this new?? product offering from GSI.
Tom
I just might try some different variations with the angle iron, it's cheap and easily available, so it won't cost much to try.
