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Message: <blockquote data-quote="cvkit17" data-source="post: 1064257992" data-attributes="member: 131276">NVH, or Noise, Vibration and Harshness, is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. - Wikipedia, Feb 2013.So what exactly is it? In other words: You sit in the car. The car runs, you feel annoyed by the noise e.g. tyre or road noise, rattling noise, tweaking noise, or even ur mother in law keep on nagging. Sorry I cant solve the last problem for you. You're on your own <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="rofl    :rofl:" data-shortname=":rofl:" />Too long exposure to certain level of noises would cause us crazy, or even death. So what is noisy and what is not, except the monster in law? Here is a few examples:1. Jet tak-off (measured at 25m) : 150 decibel (dB) - eardrum rupture2. Thunderclap, chain saw, oxygen torch : 120 dB - Pain to the ear3. Motorcycle, farm tractor, garbage truck: 100 dB - Serious damage in 8hr exposure4. Average factory, milling machine : 80 dB - Damage in 8hr exposure5. Passenger car at 65mph at 25ft : 77dB - Arbitrary base of comparison. Annoyingly loud to some people6. Office, background music, restaurant : 60 dB - Fairly quiet7. Quiet suburb, conversation at home : 50 dB - quiet8. Library, lowest limit of urban ambient : 40 dB - zzzzzZZzzzZzz krruuuh ~ <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="rofl    :rofl:" data-shortname=":rofl:" />What I did was trying to improve the NVH of my car, and test if I succeed. So how would I know if I succeed? Sound is measured in decibel, or dB in short. The usual frequency is the 'A' band. That's where dB(A) comes. Sound dB doesnt add up like 1+1 = 2, but in a logarithmic pattern. Ok dat's boring. Let me give an example: when two source of sound have the same dB (lets say you have two Monster in Law nagging the same thing at the same sound level), the add up amount of sound is 3.01dB. So if I can achieve an improvement that gives plus minus 3dB, i'm happy. Ok. Lecture session done. Now's the practical session. What do I need? Sound insulation material, and if possible, a leng lui beside me of course. <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/smokin.gif"  class="smilie" loading="lazy" alt=":smokin:" title="Smokin    :smokin:" data-shortname=":smokin:" /> Many people use polyethelyene foam as sound insulation with brands such as Insulflex or Superlon. For damping purposes, bitumen with butyl sheet is commonly used. For my case, I neither used Insulflex nor Superlon, but something similar. Trocellen. Same kind of material and serve the same purpose. Trocellen is not known for its purpose as sound insulation to Automotive dudes. But in fact, the manufacture OEM sound insulation panels for many automotive brands. What I used is actually for industrial purposes, commonly used to insulate ductings, chilled water pipes, etc. So not only do PE Foams improve sound insulation, they improve the heat resistivity too. Measurement: I dont have a decibel meter and I cant manage to borrow one. But hey! I bet you dont know...we have smartphones!! Decibel measuring apps are available and they are quite accurate. With accuracy of plus minus 2 dB. But of course, not all apps could do that, so choose wisely. I am using "decibel 10th" btw, and it's quite accurate. So lets start the pictures already !!! :slug: Oh ya, I'm doing it on a Myvi Extreme.1. This is the P.E Foam I mentioned. 1.2m width, 10m long. Another roll is my friend's.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/001_zps4a2666ad.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />2. The damping material I used. Bitumen + butyl sheet.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/f03c0897-9bc4-40fb-bae5-382e2348a1a4_zps20269f06.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />3. Rear door. I used Dunlop Contact Adhesive to stick to it.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/1f038016-02b4-436c-9413-09e4914a54af_zps792bd84e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />4. Apply some on the PE Foam, and then on the place you wana stick as well. Stick and then apply pressure. As you can see, I used some damping material near the speaker. Once done, let the glue dry under a fan or ventilation to get rid of the smell.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/35d4129d-43e1-4647-80ab-58ca90571797_zps4388667b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />5. This is how it looks inside. Notice the large free area, that's where it vibrates the most.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/003b_zps144bd4dd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />6. Stick the damping material...make sure all inch is sticked on the panel. Notice that there's two different material. The bottom one is previous insulation material being applied. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/004_zps3a585cd1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />7. I did not do two layers damping as I deem that it is unecessary. Just dampens the free area would do. So for the inner panel, I only stick some on big flat panels. DIY is all about cost efficient isnt it?<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/907f70bc-acd6-421e-9a81-681b81b5ffc7_zpsb7f88aa3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />8. This is where the speaker would be, so I put two layers of dampening material (old bitumen + new one)<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/006_zpsf5d35e3d.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />9. As I did not do 2 dampening layers, I just cover up the holes with PE Foam to reduce noise travel.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/007a_zpsab35532b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />10. Moving to the front door. Open the triangle thingy first....<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/008_zps9dd6cb80.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />11. Open up the handle in order to take out the plastic panel. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/009_zpsd0847e4b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />12. For the front door, because there's no speaker there, I only dampen the free area and not whole metal sheet. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/010_zps822e582e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />13. In order to reduce wastage, must always measure and plan!!<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/011_zpsc0a92eba.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />14. Opps, perfect. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/012_zpsa0584dc3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />15. Next, the upper firewall<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/013_zpsebe0e82c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />16. Open the bolt that secures the wiper.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/013a_zpsb21801cd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />17. Then disamble this thing out by sliding it outwards.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/014_zps19909975.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />18. There's a piece of clip that secures it. Pull it out from this clip.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/015_zps17511be0.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />19. The clip at another side is red colour<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/016_zps15d31bb1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />20. install some PE Foam on the plastic panel<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/018_zps1db8ae9a.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />21. I actually used both PE foam and Bitumen sheet on this. Bitumen first, then PE foam on top of the bitumen.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/019_zps0d9132e2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />22. More<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/020_zpscc5e309c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />23. Sticked some on the inner side of the fender. Same thing, bitumen then PE Foam on top.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/020a_zps57f5ea00.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />24. The rear boot floor...bare metal<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/021_zps7820c06c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />25. Before and after<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/025_zpsd36ffca4.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />26. Another before and after<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/024_zps7594d5d1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />27. The bare part has this very hard metal so the vibration wont be much. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/022_zpsf4a04c62.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />28. A layer of PE Foam on top of everything after that.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/713996b3-cb5d-4d1c-905f-46465979df63_zps09281e1d.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />29. Remove the carpet and put some PE Foam here.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/027_zps99eb1ab4.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />30. Stuffed the PE Foam under the carpet without any adhesive.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/028_zps84a20396.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />31. Plastic panels at the inner side of the boot. Use PE Foam.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/026_zpsca9a2235.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />32. The panel covering the spare tyre.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/bb51ae49-99dd-4110-b2e5-b1e4f2c69b92_zps8b07042b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />33. The middle plastic panel. At the seat belt that one.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/030_zps90567b8e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />34. Front Floor. Same thing, stuffed PE Foam into it. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/033_zps99bdc573.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />35.Open up the utility box and you'll see this. Yes it is a fan<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/035_zps68fe469d.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />36. PE Foam on the inner side of the utility box to absorb the fan noise.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/036_zpsb84cca89.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />37. Sticked some on the firewall...inner side of the dashboard.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/037_zpsb913ff30.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />38.Moreeee<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/038_zps04f2e559.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />39. The boot door. Open the plastic panel and put insulation inside.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/031_zps734fa0d5.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />40. Stick some PE Foam inside the metal panel.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/032a_zps8226c8c0.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />41. FDaun Pisang ~<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/041_zps6b916e66.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />42. Put some dampening material and PE foam on the fender, near the fender bar there. But this picture only shows dampening. I added PE foam afterwards.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/042_zpsf6f13edf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />43. My humble vegetarian lunch of the day ~<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/034_zps2dffa9ed.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />44. Finally, proceeded with the hood.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/044_zpse9b301d3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />45. I still have this much after the installations. So might wanna add more layers to some of the parts next time. Maybe I shall do the roof next. Previously didnt think of doing the roof as I wana reduce maily road noise.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/046_zps9b635747.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />46. This is how I positioned the sensors, in this case, the microphones and earpiece.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/IMG_2440_zps50778e70.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />NOW! THE TESTING AND ITS RESULTS EVERYBODY HAS BEEN WAITING FORRRRRRRR !!!I did my testing at DUKE Highway, both started at 11p.m. 1. First Test. In the car porch, engine off, no movement.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/001B4AFNS_zps2046d233.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />2. Second Test: In car porch, ENGINE RUNNING, idle.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/002BFAFEngStart_zps1b0cd108.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />3. Third Test: In car porch, ENGINE RUNNING, AIR CONDITIONING ON. <img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/003B4AFACON_zps91ca3b9d.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />4. Forth Test: Driving at 60km/h, no music, AC On<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/004BFAF60_zpsa8543227.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />5. Fifth Test: Driving at 110km/h, AC On. Note that the reading for 110kmh is lower than 60 which is weird. But take note at the maximum reading and the graph. At 60kmh there's less disturbance and averagely lower. Its just at that time, the reading was caught at 70dB.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/005BFAF110_zps7a01806b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />6. I sped up to 120km/h and this is what I got.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/006AF120_zps01674203.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />7. And just for information, with all windows down and at 110km/h. But this was before the insulation is installed.<img src="http://i1266.photobucket.com/albums/jj533/cvkit17/Sound%20Insulation/008WD_zps42097145.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />So there we are with respective readings. The effort resulted in 2-4dB decreased in noise level, which is a very good thing. It means that my effort isnt down the drain <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="rofl    :rofl:" data-shortname=":rofl:" />Personally, without seeing these data, what I can feel after installing the insulation:1. Road noise level reduced, but not to the extend of heaven and hell2. No more rattling noise when I blast the speakers!!! Previously there was some rattling sound which is very annoying made me canot turn up the volume too much.3. ICE is improved. The music is now more solid feel.4. Doors feel solid, especially the rear door. The satisfaction level of completing a DIY = pricelessThe adrenaline pumping feel to your heart when you nearly fucked up your DIY = also damn priceless <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="rofl    :rofl:" data-shortname=":rofl:" />Thanks for viewing. Please comment / suggest if there's any in your mind <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/driver.gif"  class="smilie" loading="lazy" alt=":driver:" title="Driver    :driver:" data-shortname=":driver:" />:wavey:<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/driver.gif"  class="smilie" loading="lazy" alt=":driver:" title="Driver    :driver:" data-shortname=":driver:" /></blockquote>

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