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Thread: Sound Proofing

  1. #1
    Senior Member Azmodon's Avatar
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    Sound Proofing

    The '10 grand tin can' as we all know, earns its name when it comes to road noise and every other type of noise that could exist in a car - anyone who's stripped the trunk of carpet and plastic knows you can see outside from inside where you really aught not to lol

    So while I figure out the mounting of the diffuser, I'm also getting started on phase 3 of sound proofing the car.

    Phase one - strip the interior and line the floor with (not) dynamat (used "noico"), pictures to follow.
    cost: ~$75

    Phase two - bridging the gaps in the trunk (wheel well to fender... damn thing's a drum skin) with "reflectix" - a thermal barrier for duct work that just so happens to be a great sound absorber (unpoppable high grade bubble wrap lined on both sides with foil)
    cost: ~$30

    Phase three - I'm going to fabricate some VB-3 from Cascade Audio. Normally the stuff is $9.80ish per square foot... I'll be laminating aluminum foil in place of the lead sheet they use since it's density changes, not density itself, that causes these materials to function. The foam I'll be using is Volara since it's rated for a 54 decibel drop at 1/2" thick. Since I can get 250 square feet of foam for $70 (+shipping... which'll be another 50ish because it's so heavy). Halved since it's the bread of the sandwich puts it at 125 sq-ft.
    250ish square feet of heavy duty aluminum foil is ~$6, assuming I use 10 layers to reach somewhere near 1/64th thick, that's ~25sq-ft per roll, 5 rolls to do 125 = $30... + spray adhesive... so like, $160ish, to get 125 square feet of VB-3... $1.28 per square foot, instead of $9.80/sq-ft + shipping.

    Won't make all 125 though, should be more than enough to load the doors without doing that and then line the inner skins with just the foam.

    So that's what I'll use this thread for - progression pics of the VB-3 assembly will come, for now, here's some of the ones I took while installing the butyl rubber sheets.

    rear cover removal
    Name:  1- back left cover off.jpg
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    Name:  2- back right cover off.jpg
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    Pulling the headliner not all the way off
    Name:  3- liner pulled down.jpg
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    Mind the air bags
    Name:  5- liner air bag.jpg
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    after feeding in a sheet, smoothed over scrapper acts as the 'roller'
    Name:  10- press liner padding on.jpg
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    Name:  11- liner padding complete.jpg
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    Last edited by Azmodon; 10-11-2017 at 11:17 AM.

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


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    Senior Member Azmodon's Avatar
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    Rear door - plastic pulled up (all pop latches)
    Name:  a1- Back Door Plastic Popped up.jpg
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    How to remove these dudes
    Name:  a2- Clip 1.jpg
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    Name:  a3- clip 2.jpg
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    Name:  a4- clip 3.jpg
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    4 bolts per seat, out they come
    Name:  a5- Drivers Seat Out.jpg
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    another for the seat belt
    Name:  a6- Seat-Belt unbolted.jpg
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    the pile
    Name:  a7- parts removed.jpg
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    Name:  a8- Front Seat seat-bet cover.jpg
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    Pulling at the edges, everything just comes up
    Name:  a9- front seat seat-belt cover 2.jpg
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        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


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    Senior Member Azmodon's Avatar
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    peeling the carpet back - Didn't remove the centre console... really should've lol

    Name:  a10- Driver Side Carpet up.jpg
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    Name:  a10A- passenger side - carpet up.jpg
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    Name:  a10B- passenger foam removed.jpg
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    Name:  a11- drivers footwell.jpg
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    Mind the stem
    Name:  a12- Plastic Stem attachment.jpg
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    Name:  a13- air duct - apart.jpg
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    Name:  a14- Back seat beginning.jpg
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    Name:  a15- Back seat padded.jpg
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    Name:  a16- passenger padding down.jpg
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    Name:  a17- rear passenger padding down 2.jpg
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        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


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    Senior Member Azmodon's Avatar
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    fin
    Name:  a18- rear passenger padding down.jpg
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    so yeah... now to glue layers of foil together as I wait for foam to arrive :P

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


  5. The Following 5 Users Say Thank You to Azmodon For This Useful Post:

    HammyJ (03-24-2021),jephpej (11-28-2020),MrMicra2015 (03-22-2021),not_a_bot (11-02-2017),SuperTurbo (11-25-2017)

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    Quote Originally Posted by Azmodon View Post
    fin
    Name:  a18- rear passenger padding down.jpg
Views: 772
Size:  99.9 KB

    so yeah... now to glue layers of foil together as I wait for foam to arrive :P
    sorry to bring up a post from so long ago, but how is the difference, did you find it worth it?

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    Senior Member Azmodon's Avatar
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    I did, with the race exhaust it was quite loud inside. I've since built a silencer to insert in the muffler, and it's really nice now but still keeps the growl. If I took the time to do it again, I would also put more effort in to fully covering the roof.

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


  8. The Following User Says Thank You to Azmodon For This Useful Post:

    MrMicra2015 (03-22-2021)

  9. #7
    Senior Member MrMicra2015's Avatar
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    yikeberries! you disassembled your brand new car!
    2015 Micra S (manual)
    no A/C /no power options
    Feb 2015 build
    9,999 purchase price + tax..no additional 1600$ because it was a 2015 purchased in 2016
    so receipt says $8,399....+1600 .... so they look good i guess...for a brand new car!

    Covid 19...she up on blocks!!!

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    I want to do as much as i possibly can on mine, how much did you use, the stuff im ordering comes in square meters and i dont want to get too little but i dont want to have enough for a second micra when done either haha, i plan to do the whole floor, hood, firewall, roof, hatch, doors, up the pillers front mid and back as much as possible, plan to make this tin car sound like a mercedes, going to do a full sound system probably next year as well. i was going to install a/c but havent been able to aquire the parts needed, so sound deadening i shall do.

  11. #9
    Senior Member Azmodon's Avatar
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    I would advise against putting anything not designed for the hood, on the hood. Most of the stuff I used is butyl rubber, which is really sticky, but when heated can lose some stick and catch fire given the surfaces in the engine bay. I bought 36 sq-ft (3.4m^2) of the stuff and would probably have needed 2 of those to finish the door skins, roof, tunnel etc.

    I was able to greatly reduce road noise but the sections that were lacking are the doors and roof. The doors being open to the air with fair sized holes and the only 'sound proofing' they have is the plastic sheet covering the cutouts. While a butyl layer can be added to the inside of the exterior door skin, some type of foam pad (I made the foam aluminum sandwich) cut to shape really helps. Don't forget behind the wheel well liners in the front, where your foot sits - some layers of spray on rubber coating work well.

    The biggest issue is, for example, the trunk, peel back enough and you'll find open holes to the outside. I used a layer of rubber, then covered that with... aluminum bubble wrap... homedepot - just sealed air pockets to catch some of the higher pitched stuff. Also if you leave the trucks divider plate in (it won't hurt any bass coming from back there) you can line the bottom of it too.

        __________________________________________

        click to view fuel log View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...


  12. #10
    Senior Member MrMicra2015's Avatar
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    turn the radio up..dont hear wheel bearings,belt noise, the guy next to you,tappets, etc JK!


    2015 Micra S (manual)
    no A/C /no power options
    Feb 2015 build
    9,999 purchase price + tax..no additional 1600$ because it was a 2015 purchased in 2016
    so receipt says $8,399....+1600 .... so they look good i guess...for a brand new car!

    Covid 19...she up on blocks!!!

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