Sound Reduction Project - Diesel Forum - TheDieselStop.com
1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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post #1 of 16 (permalink) Old 06-05-2017, 08:19 AM Thread Starter
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Sound Reduction Project

My truck is loud and wears me out on long trips. I have completed my research and am ready to get started on reducing the sound. I plan on documenting my progress and showing before and after decibel readings along the way. Hopefully the money and time I spend will be rewarded. Here are my general plans. Please feel free to steer me in the right direction if I am doing something wrong:


1. Doors. Install 80 mil Noico sound deadening mat on metal at roughly 50% coverage. Install Noico 157 mil Heat Insulation pad (closed cell foam) over top. Finish with TMS 1lb Mass Loaded Vinyl Acoustic Barrier at 100% coverage.


2. Floors: Same process as above assuming I have the room for the closed cell foam.


3. Ceiling. Same as above sans the MLV.

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
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post #2 of 16 (permalink) Old 06-05-2017, 12:29 PM
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Check out post #9 from my work log link below. There are some large access holes in the doors that should be filled but do it in a way that access can still be relativity easy to gain when needed. I used plywood with a stainless backer.

Good luck with your project, I will be looking forward to seeing your results!

2007 F350 SRW 6.0L Auto, 3.73LS, 172"WB 4x4. Viper Alarm/RS, WD pillar Guages,AutoEnginuity, 100gal polished alum fuel tank.
All Sold: 99.5, early03 , 2004 - all were 172" wb 4x4 lariat's.

My Worklog - *Updated 8/18 with Edge CTS2 install click here =>*:
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post #3 of 16 (permalink) Old 06-05-2017, 04:10 PM Thread Starter
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I conducted a pre-project decibel check. At 70mph with the decibel meter at ear level it read 75.8 decibels. The reading at the door speaker was 82 decibels. At warm idle it read 52.5 at ear level and 57.5 at the door.

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
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post #4 of 16 (permalink) Old 06-05-2017, 04:15 PM Thread Starter
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Phil,

Really neat project you completed. Nice job. Did you use the standard B-Quiet sound dampener?

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
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post #5 of 16 (permalink) Old 06-06-2017, 07:15 PM Thread Starter
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Completed the driver side door. The fit was very tight and took quite a bit of work and trimming to get it in. The results weren't very good but have a tiny bit of promise to them.

70 mph at ear level was 75.9, the door was 80.
At warm idle ear level was 53, the door was 58.

So the only real change was a drop of 2 decibels at the door at 70mph. I think (hope) the floor is where the biggest results will come through.

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
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post #6 of 16 (permalink) Old 06-14-2017, 02:51 PM Thread Starter
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I finally got around to removing all the interior. Ford did put some sound proofing in but not much. Attached is a picture of the back wall. There are two big square grommet looking things. Does anybody know what they are?
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2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
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post #7 of 16 (permalink) Old 06-14-2017, 03:15 PM Thread Starter
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I also noticed water and rust in the back passenger side corner. Anyone have an idea of the source?
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2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
jeffreybandel is offline  
post #8 of 16 (permalink) Old 06-14-2017, 04:03 PM
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The firewall has hardly any insulation.

Run surgical tubing through all the door seals.

This will help a lot.

Get the updated steering shaft seal as well.
That makes a huge difference.

Another thing that can really quiet the truck down is engine mods.

A fuel rail crossover and high pressure oil crossover can really quiet down the engine.

A closed Intake system like ford AIS also helps.
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post #9 of 16 (permalink) Old 06-15-2017, 07:45 AM
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Quote:
Originally Posted by jeffreybandel View Post
I finally got around to removing all the interior. Ford did put some sound proofing in but not much. Attached is a picture of the back wall. There are two big square grommet looking things. Does anybody know what they are?
Basically a vent.

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post #10 of 16 (permalink) Old 06-16-2017, 05:35 AM Thread Starter
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It seems like a good source for noise. Is it needed or can I close it off?

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
jeffreybandel is offline  
post #11 of 16 (permalink) Old 06-16-2017, 06:03 AM Thread Starter
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I did the door seal mod last year and it helped a lot. I just did the updated steering shaft seal but unfortunately it had no impact.

2002 F250 Lariat Crew Cab 8ft bed
1,500 lb dog box in bed
9,800 lb travel trailer
Automatic Transmission
4x4
3.73 Limited Slip Differential (rebuilt July, 2014)
Pretty much stock
Riff Raff Air Filter
DP Tuner PCM change--Econo Mod
216,578 miles as of July 17, 2014
"Gooch" coolant flush with Rotella ELC
Mobil 1 Synthetic in AT.
Gone through 6 CPS's
Gone through 4 alternators
Gone through 2 GPR's
jeffreybandel is offline  
post #12 of 16 (permalink) Old 06-16-2017, 07:24 AM
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Quote:
Originally Posted by jeffreybandel View Post
Phil,

Really neat project you completed. Nice job. Did you use the standard B-Quiet sound dampener?
Sorry for the slow reply, I was travelling for the last week and a half. It was the premium B-Quiet, I forget what they called it.

Regarding those rear vents, yes you need them. When you slam the last door shut with all the windows up, the air pressure needs a place to escape. Also when the HVAC is running, again a positive pressure created in the cab needs out.

2007 F350 SRW 6.0L Auto, 3.73LS, 172"WB 4x4. Viper Alarm/RS, WD pillar Guages,AutoEnginuity, 100gal polished alum fuel tank.
All Sold: 99.5, early03 , 2004 - all were 172" wb 4x4 lariat's.

My Worklog - *Updated 8/18 with Edge CTS2 install click here =>*:
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post #13 of 16 (permalink) Old 06-16-2017, 11:30 AM
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If the vents weren't there, and the airbags inflated with all windows rolled up, you'd likely rupture an eardrum from the pressure generated inside the cab.

My 2001 rear cab corner rusted through from water between the inner and outer panel. Seems the story was the roof seam sometimes lets water between those panels.

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2015 F-250 XLT, SC, LWB, 6.2L V8, 6R140, 3.73 E-Locker, Bronze Fire, Roof Lights, Upfitter Switches, Wheelwell Liners. ORDERED 6/10/14, delivered 8/26/14............let the mods begin!

I STILL miss my V-10 !

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for modifications: Weathertech all weather floormats, Weathertech dark wind deflectors, Groboski Highland Mudflaps, ARE DCU Cap, Truck-lite ID bar, Blazer Aux back-up lights, Wolf Automotive van console, Berkeley Fishing Rod Holders, Bilstein 4600's.

2001 F-350, XL, SC, LWB, 6.8L V10, 4R100, 3.73 LS. RETIRED at 214,500 August 2014.
1986 F-150, XL, SC, LWB, 351 4bbl, C-6. RETIRED at 165,000 May 2001.
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post #14 of 16 (permalink) Old 07-04-2017, 08:12 AM
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Sound Reduction Project

I recently put Dynamat 1/8" butyl under hood, four doors, rear cab wall and inside the outer truck bed skin. I added 1/4" Dynaliner under the hood and on rear wall. DBs measured at head level were cut by 6db, which is a reduction of loudness by 50%. I used scrap Dynaliner under the drivers footwell and intend to put butyl on the roof soon (still have half box); along with additional insulation under the dash. Really made a big difference for $350.

I left the cab wall vents alone.


Stephen. Diesel newbie
2006 F250 CC SRW SB
Purchased March 2017 with 41,000 miles
Updates: coolant filter, side mount truck boxes, backup camera, blue spring, dynamat in doors, rear cab wall, and under hood.
2004 Jayco 29 BHS
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post #15 of 16 (permalink) Old 08-14-2017, 12:49 PM
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Pressure release valves

Quote:
Originally Posted by jeffreybandel View Post
I finally got around to removing all the interior. Ford did put some sound proofing in but not much. Attached is a picture of the back wall. There are two big square grommet looking things. Does anybody know what they are?
This are to let the air pressure release when you shut the door so it doesn't blow your eardrums.

02 F250 CC 4x4 7.3 Lariat, 3.73 rears, DPTuner F5, WW2, IH UPs, Airdog+Frx, HPOilX, BanksMonster Exhaust, Centramatics, Gearvendor, Custom rear springs, [BTS!], 130k, Dieselsite 203, Eaton Truetrac. FYI- Blackout/2/3 all me! Can't get back into my original logins.
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