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Old 08-16-2019, 12:06 AM #16
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if i had the time and paitence, i would of do a spray on liquid deadener over the sound deadener, that should add another layer of treatment.
Spectrum Sludge Deadener: Sound Dampening Liquid - Second Skin Audio

let us know how your results turned out. i wouldnt spent my time in the engine bay. it just me.
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Old 08-16-2019, 10:58 PM #17
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Quote:
Originally Posted by riceandpho View Post
if i had the time and paitence, i would of do a spray on liquid deadener over the sound deadener, that should add another layer of treatment.
Spectrum Sludge Deadener: Sound Dampening Liquid - Second Skin Audio

let us know how your results turned out. i wouldnt spent my time in the engine bay. it just me.

Others have said the same, but based on my results, the wheel wells are major sources of noise. They’re essentially bare sheet metal with tires spinning who know how fast inside so it stands to reason that treating them will help. I was very pleasantly surprised at how much quieter it was today now that both fronts are done.

The best thing about listening to music now is how much more mid-range detail is audible.

Last edited by Bluesky 07; 08-17-2019 at 08:25 AM.
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Old 08-16-2019, 11:57 PM #18
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Nice! I'd considered doing something similar when I gutted mine again to redo the system last year but never got around to it. Would've been curious to see the actual db drop but perception is reality in most of these cases anyway (avoiding getting into the whole sound deadening vs panel resonance reduction of cld, this isn't DIYMA afterall lol)...especially since this isn't too expensive/time consuming to go ahead and do the wheel wells once you've already committed.

How do you like the Noico Green CCF? I used Noico 80mil myself and was surprised at how good it went on and seemed to be legit butyl to boot.
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Old 08-17-2019, 08:37 AM #19
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Originally Posted by CrimsonCountry View Post
Nice! I'd considered doing something similar when I gutted mine again to redo the system last year but never got around to it. Would've been curious to see the actual db drop but perception is reality in most of these cases anyway (avoiding getting into the whole sound deadening vs panel resonance reduction of cld, this isn't DIYMA afterall lol)...especially since this isn't too expensive/time consuming to go ahead and do the wheel wells once you've already committed.

How do you like the Noico Green CCF? I used Noico 80mil myself and was surprised at how good it went on and seemed to be legit butyl to boot.

100% satisfied with the value, ease of use, and effectiveness of both the 80 mil butyl & Noico green foam.

You’re right about perception as being part of how you personally measure the results. It depends on variables such as installed equipment (A/T tires for instance) and even the state of your hearing (I have tinnitus & other effects from jet engine exposure, but the results I’ve described are relative to before adding deadener so that only affects my perception overall, not the product’s effectiveness).

I also strongly believe that every little bit helps. For example, on its own, doing the A-pillars is hardly worthwhile, but as part of an overall strategy, that fraction of a decibel adds up. To take a business example, what’s a single cherry tomato worth? But years ago, an American Airlines flight attendant suggested removing them from salads b/c people seldom ate them. The company listened and the annual savings was $100K+ (at the time, AA operated over 4,000 daily flights). She got a nice chunk of that too through the company’s IdeAAs in Action program.

Last edited by Bluesky 07; 08-17-2019 at 01:32 PM.
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Old 08-19-2019, 08:16 PM #20
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Quote:
Originally Posted by Bluesky 07 View Post
This series of posts explains my approach to sound deadening my truck, what Iíve done and plan to do, and results/observations to date.

Disclaimer: I understand that there are many opinions on how best to go about sound deadening. I did a lot of research before deciding how to proceed. Please take whatever info you find useful here and discard the rest.

Philosophy: I feel like layers between sound and occupants is key to a quiet cabin along with addressing noise close to the source, so I used leftover material to do places some people may ignore, for example the underside of the A-pillars, door sills, and kick panels, and inside the glove box. Itís not hard; I just take the panel, the foam material & maybe a small butyl piece for rattle dampening, and some scissors into the house and do it while I watch TV. Why? Because IMO, every fraction of a decibel makes a difference.

Thatís also why I am doing the wheel wells. More on that in a later post.

Materials (from Amazon)
Noico 80 mil butyl deadener & Noico Green foam insulation. Very pleased with the effectiveness & value.

General Advice
- This is tedious work. Bring your patience.

- Metallic HVAC or dryer vent tape with a peel-off adhesive back is outstanding for covering seams such as around the panels covering the large door openings. I originally bought it for installing a dryer vent pipe but itís perfect for this use as well.

- A short piece of PVC pipe makes an excellent flattening tool.



Doors
Most people agree that doing the doors gives the best bang for the buck if you donít plan to do the entire interior. This was the first thing I did, with a full coverage layer of butyl & foam on both the inner & outer panels. I used a leftover plastic honeycomb yard sign to cut covers for the large openings & attached them with the tape I mentioned. This is just before adding the butyl layer to the inner front door panel.



Butyl layer on the inner rear door panel:



Important: stay within the ďsunkenĒ area and away from the fastener holes, otherwise the trim panel may not go back on.

Final layer on. Ended up having to trim a bit of it from the raised edge areas to get the trim to fit properly.



Door results: We have to start with the understanding that a 4Runner is never going to be luxury car quiet. With that said, there were two significant and complementary outcomes after finishing the doors. First, there was a noticeable lessening of noise, particularly in the frequency range that makes conversation in the car easier to hear and understand, so thatís a bonus. Second, as many have mentioned, the door treatment really maximizes speaker performance. Those two things taken together make doing the doors absolutely worthwhile.

My next post will cover the process and results of doing the rear wheel wells.
Can you tell me if a single order (from Amazon) of the Noico butyl and green foam is enough to do all four doors? Thanks!
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Old 08-20-2019, 05:48 AM #21
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Old 12-17-2019, 10:56 AM #22
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Does any of this mitigate wind noise? I get so much wind noise on the driver's side door.

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Old 01-02-2020, 06:51 PM #23
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Subscribed! Thanks for the great pics
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Old 01-03-2020, 12:15 AM #24
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once you guys add a layer to the front floor areas, its alot quieter when you drive during rainy days. i can barely hear the splash at the wheel wells.

im waiting on new speaker adapters and should be redoing some of my deadening in a few days. took advantage of the discounts from tacotunes so i decide to replace my mdf speaker adapters, hopefully my 4 sheets of secondskin is enough for front and back speaker area. also trying some new soundskins rings. its replacing the fast rings.
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Old 01-03-2020, 11:12 AM #25
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Great thread! I have a box or two of sound deadening left over from other projects that I have slowly started to use in my 4Runner. The first thing I did was the inside of the hatch and the hatch plastic interior trim. Only issue was this added weight wasn't something that my rear hatch struts could keep up with. I think I went a little overboard haha.

In others experience, it seems like doors, rear wheel wells, and front floor are the best bang for the buck, does this seem right to those that have done a bit more deadening than I have?
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Old 01-14-2020, 11:58 PM #26
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@gloch , doing the doors & the inside of the A-pillar trim does help with wind noise.
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Old 01-15-2020, 10:53 AM #27
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@gloch , doing the doors & the inside of the A-pillar trim does help with wind noise.
Good to know. Thanks!
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Old 01-15-2020, 12:52 PM #28
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This is super well done, great thread.

I doubt that I actually will get to it anytime in the near future, but man I would like to.
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Old 01-30-2020, 03:29 PM #29
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Loving this thread. I have a bunch of butyl based deadener and foam in my garage waiting to go in once I figure out the radio details. Sub'd!
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Old 01-31-2020, 12:56 PM #30
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x2, great thread.

I did everything behind the rear seat with NOICO butyl this fall on a lark and was truly impressed at how much it cut the road noise... it was like someone turned the bass up on the factory sub. I was so impressed that I ordered another round of butyl and the thicker foam to go over it and plan on doing the whole interior including the roof save maybe the floor pans.
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