SOUNDPROOF Truck's Noisy Engine - SOUND TEST Before & After

In this video I will be sound deaden engine bay of my Toyota Tundra. I will also be using a decibel meter to determine how much noise was reduced after sound deadening the hood/bonnet of the car.

I will show you step by step How to apply a sound deadening mat to your hood. The sound deadening material I use in this video is from Canopus. Links to the products I used in this video bellow. You can choose between black and silver within each link.

Here are some of the soundproofing material I recommend. These are affiliate links that gives me a commission at no extra cost to you. Thank you for supporting my Channel!

Here are more videos regarding car soundproofing and vehicle sound deadening material test and car soundproofing before and after.

Bear in mind that some of the links in this video are affiliate links, and if you go through them to make a purchase, I will earn a commission at no extra cost to you.

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[tronmcrae]

Best part of this video was watching how clean you got the underside of the hood.

[lohengrinknight]

I did the same on the hood of my truck. My readings at 65 mph on the same road before and after installing butyl sound deadener were 71 and 69.5 db. So far that's all I've done, but I'm planning on doing more things to bring the db reading to 67. That's my ultimate goal with a US$ 200 budget.

[tgriebe]

Normally the under hood absorber is a molded fiberglass product intended to absorb higher frequencies. The mass loading and damping is done on the firewall itself and inside with the dash absorber.

[PabloGonzalez-iopq]

Nice video! Just a quick comment: A 3dB difference does not mean "half" or "double" the sound perceived by a human, which is around a 10dB difference. 3dB applies to amplification power, since in order for an audio amplifier to produce an extra 3dB, it needs twice the power.

[shawng]

After only using a little so far, this is one of the best products you can add to a vehicle. I have an older chevy silverado LTZ. Has the same interior as the Denali of the same year. 3 full sheets so far have made such a dif it's hard to explain. Mine has a huge hood mat under it. The firewall would make a diff as much as anything. You could literally throw a couple scrap pieces on a panel and kill the ring in it. That's why OEM does that. 1 square on a roof skin will kill the whole panel. learn how much coverage you need and how much starts diminishing returns. You will waste a ton you don't really need. It doesn't work like those foam blocks in a sound booth. ITs made to stop the panels from becoming a speaker itself.

[Mauser]

"quality of life improvements", decouplers (Kilmat/Dynamat) as used in this content is an awesome step to take. I appreciate that you actually used a db meter. just as I did my vehicle, I suggest focusing on where the things attach as that's the transmission points. Where the shocks, springs, and other suspension parts connect underneath. For example, under the rear seat of an old Jeep Cherokee (XJ) is close to where leaf springs connect as well as the shocks. Wheel wells are very solid, which shouldn't need decoupler but can be insulated. Insulation I refer to Siless for example, a close cell foam with a film that helps as well. So near your hood mounts and latch's are where I would use a decoupler, then install insulation. Yet I don't know if the roof had been done, besides the usual door panels, cargo area and rear quarters. Let me throw in cork as an insulator and decoupler that has it's own properties for home and vehicle use.

[gabet]

What if you just cover the whole under part of the hood?

[tjonesauto]

That's radiant noise from the exhaust at the 1st curve of the downpipe. The surface (floor) above it is the most efficient spot to insulate sound.

[jasjeet]

one question: why do you cut the sheet instead of using whole sheet?

[PiRXa]

Hi there!
Interesting video, just wanted to add my two cents. For measuring the impact of deadening under the hood, you might actually want to measure noise level in standing car, just revving the engine up to reasonable rpms.
At the 100km/h speeds road/wind noise probably is stronger than engine noise and you won't notice gains unless your cabin is already deadened.

[lohengrinknight]

Since you know a lot of soundproofing materials for home purposes, which products do you think would help to bring down the dB's if installed inside the doors and on the back wall of a pickup truck. The sound deadening mats and foams available for vehicles really don't seem to cut that much noise and are very expensive. I'm not sure if there's a wooly material for homes of about 0.5 in thick that could be glued onto the metal to help reduce noise. Thanks for your videos.

[porscheguy]

I’m questioning the claimed thickness of this material. 80mm is over 3 inches thick which this material clearly isn’t. I think each piece is probably 8mm thick not 80mm.

[scottykilmer]

4:40 WOW ! that car must have a big exhaust manifold leak somewhere ?? 🤣🤣

[robertfontaine]

Spectrum analyzer makes a lot more sense for any of these. Everyone uses cheap absolute db and you have no idea what the impact of the sound deadening material really is.

[melaniezette]

You must lower 10 dB to feel twice lower. Nevertheless dampening vibrations where the ear is most sensitive is essential. You have to analyse the sound. The most important is what you feel.

[pauloalmaden]

Just what I was looking for. Thanks for this

[SaycoPworrell]

Need to mount that dB meter correctly to make this a genuine test and compare. Mount it at the center

[backseatcovers]

That just convinced me to put some under the hood/bonnet of my little Korean shitbox.
And I learned a new word - mil! Never realised that „mil” is a completely different unit to millimetres!

[danbell]

Can you also cover the firewall with this material?

[ukstuartpatterson]

Theres alot of mounting holes unused - where you stuck that sound deadener. Looks to me like there should be an OEM fibre matting pinned in place there and that would have been a superior result. You could still go to a breakers yard and get a used one and some plastic "christmas trees" and bang that onto the panel.