Sound proofing

both inside and out

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Sound proofing

Postby Jelmer » Fri Nov 10, 2017 3:33 am

Now that our 93 goes into hibernation for the winter it is a good time to get the truck a bit more quiet.
What have you guys done to make it more quiet on the freeway? In Holland the normal freeway speed is 80-85mph so pretty fast which causes a lot of noise.
A lot of noise comes from the doors, rhs under the dash and from the gear boot.

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Greetings from the Netherlands where there are only 2 or 3 1stgens!
93 D250 Cummins, G360, 4" stainless exhaust, BHAF, DennyT stage 2 pin, 3200rpm governor spring, 12cm housing, rest stock.
03 VW Bora 1.6
83 Datsun Laurel 4.5 32v V8
84 Nissan Patrol 2.8i
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Re: Sound proofing

Postby Philip » Fri Nov 10, 2017 5:48 am

I used Lizard skin on the floors. I then went over that with Dynamat. I also did the roof and inside of the doors with Dynamat. I had the dash out at the time so the firewall was also done.

The biggest improvements are the floor and the doors. Our doors let a lot of sound it. The firewall has enough supporst welded into it. There isn't much noise from it.

The floor shifter lets in a lot of sound. My truck used to be an auto. When I converted it to stick. I noticed the extra noise from the shifter.
93 W350 Club/cab w/duals, buckets & console, B&W flatbed, G56, 6 spd, 3:07 rears, gages, HX40/16, 4" exhaust, 6X.018 sticks, rear air ride suspension
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Re: Sound proofing

Postby meby » Sat Nov 11, 2017 6:30 am

I used dynamat extreme on the roof, floor, doors... basically anything resembling a flat surface. The doors I also gave a thin layer of dynaliner. Two layers of jute insulation on the floor with a third over the hump.

Presently the truck is within 2 decibels of dad's 05 Cummins at 60 mph.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


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Re: Sound proofing

Postby Richie O » Sat Nov 11, 2017 5:38 pm

Where and how do you do the doors? Where does the material go?
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Re: Sound proofing

Postby PToombs » Sat Nov 11, 2017 6:22 pm

Richie O wrote:Where and how do you do the doors? Where does the material go?


You just peel the backing and stick it to the outside of the door. The noise comes from outside, so that's where you need it the most.













:finger:
pete

Just enough power to break everything behind the crankshaft.
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Re: Sound proofing

Postby meby » Sun Nov 12, 2017 5:24 pm

Richie O wrote:Where and how do you do the doors? Where does the material go?



before I reassembled the doors, I put strips of dynamat extreme on the outer shell and then right before I put on the inside panel, I covered each door under the panel area with an entire sheet of dynamat extreme. Plus I put some thin 1/8" soundproofing on the back side of the panel itself.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


www.ebyfarmsllc.com
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Re: Sound proofing

Postby Richie O » Sun Nov 12, 2017 5:31 pm

meby wrote:

before I reassembled the doors, I put strips of dynamat extreme on the outer shell and then right before I put on the inside panel, I covered each door under the panel area with an entire sheet of dynamat extreme. Plus I put some thin 1/8" soundproofing on the back side of the panel itself.



Ok, I thought that would be a pain to have all the layers between the panel and the door.


And to Pete, as always your a great help, you pinhead :lol:
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Re: Sound proofing

Postby PToombs » Sun Nov 12, 2017 5:34 pm

Well, I figured it was kinda common sense to put it on the door skin. ;)
pete

Just enough power to break everything behind the crankshaft.
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Re: Sound proofing

Postby meby » Mon Nov 13, 2017 5:07 am

Richie O wrote:
meby wrote:

before I reassembled the doors, I put strips of dynamat extreme on the outer shell and then right before I put on the inside panel, I covered each door under the panel area with an entire sheet of dynamat extreme. Plus I put some thin 1/8" soundproofing on the back side of the panel itself.



Ok, I thought that would be a pain to have all the layers between the panel and the door.


If I ever have to get back inside the door, it will be a bit of a pain. Until then, I figured one solid sheet should help cut noise a lot.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


www.ebyfarmsllc.com
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meby
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Re: Sound proofing

Postby Philip » Mon Nov 13, 2017 7:05 am

Hea Matt Give me some DB numbers on your truck.

Base number just setting in the truck not running. My number was 60

Truck idling setting. Mine was 90.

Running 60 MPH in OD cruise set no radio. Mine was 94
93 W350 Club/cab w/duals, buckets & console, B&W flatbed, G56, 6 spd, 3:07 rears, gages, HX40/16, 4" exhaust, 6X.018 sticks, rear air ride suspension
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Re: Sound proofing

Postby Jelmer » Tue Nov 14, 2017 7:42 am

Thanks guys! Looks like Dynamat is the stuff to get!
Greetings from the Netherlands where there are only 2 or 3 1stgens!
93 D250 Cummins, G360, 4" stainless exhaust, BHAF, DennyT stage 2 pin, 3200rpm governor spring, 12cm housing, rest stock.
03 VW Bora 1.6
83 Datsun Laurel 4.5 32v V8
84 Nissan Patrol 2.8i
Jelmer
fuel screw!!!!
 
Posts: 53
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Re: Sound proofing

Postby meby » Tue Nov 14, 2017 10:22 am

Philip wrote:Hea Matt Give me some DB numbers on your truck.

Base number just setting in the truck not running. My number was 60

Truck idling setting. Mine was 90.

Running 60 MPH in OD cruise set no radio. Mine was 94

It's been eight months since we tested...I think mine was 70 db after. No before numbers. Don't hold me to that though, a lot of things have run through my brain since. If I get a chance, I'll look it up tonight.
Last edited by meby on Tue Nov 14, 2017 12:53 pm, edited 1 time in total.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


www.ebyfarmsllc.com
User avatar
meby
14mm rotor
 
Posts: 855
Joined: Sun Jan 14, 2007 1:14 pm
Location: Southwest Michigan
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Re: Sound proofing

Postby meby » Tue Nov 14, 2017 12:52 pm

70 db was right. 55 db idling.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


www.ebyfarmsllc.com
User avatar
meby
14mm rotor
 
Posts: 855
Joined: Sun Jan 14, 2007 1:14 pm
Location: Southwest Michigan
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Re: Sound proofing

Postby Pausma » Wed Nov 15, 2017 8:50 am

When I soundproofed my cab I removed the seat and carpet. The product I used was called fat mat, similar to dynamat but a little cheaper. I put fat mat as far up the firewall as I could without pulling the dash apart. I then applied fat mat on the entire floor and all the way up the back of the cab to the rear window. Made a huge difference mostly with engine noise and vibrations in the cab.

At highway speeds the wind noise is still pretty loud. I have some fat mat left and I plan to put it inside the doors.

Another area to look at is the quality of your door and window seals. I know the triangle windows are a leaky spot on first gens. I plan to do door seals on my truck and see if it helps and if I get ambitious enough I may replace the window seals as well but I know those can be a real pain.
91 D350, adjusted fuel pump, custom exhaust, pyro, tach and boost gauges
2001 2500 4x4 stage 2 afe intake, custom exhaust, edge insight
06 VW jetta tdi 5 speed, custom exhaust, egr blockoff, 1.5 malone tune
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Re: Sound proofing

Postby Jelmer » Thu Dec 14, 2017 1:06 am

It is indeed noisy at the door seals and window seals. We replaced both already (OEM Dodge) but the window seals are not keeping the window thight. You can wiggle it front and back and you feel the wind coming in when driving. I'm thinking about putting some foam like stuff behind the window seals so that the window sit thighter in them.
Greetings from the Netherlands where there are only 2 or 3 1stgens!
93 D250 Cummins, G360, 4" stainless exhaust, BHAF, DennyT stage 2 pin, 3200rpm governor spring, 12cm housing, rest stock.
03 VW Bora 1.6
83 Datsun Laurel 4.5 32v V8
84 Nissan Patrol 2.8i
Jelmer
fuel screw!!!!
 
Posts: 53
Joined: Thu Jan 15, 2009 7:40 pm
Location: Netherlands
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