Road/Wind noise dB readings

Discussion in 'Gen 3 Prius Accessories and Modifications' started by VovCA, Jan 8, 2016.

  1. VovCA

    VovCA Member

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    I installed Sound Meter app (Android) and made some measuring.
    at 70-74mph on normal pavement 70-72dB. Average noise was 64dB. On rough freeway more like 72-74dB. Got average 66dB (may be 3/18 hwy)

    I think one reason why noise is more noticeable because on low speeds and stops car is very quite, so on hwy it's a quite contrast. G4 improved noise insolation, so yes it's an issue.
     
    #1 VovCA, Jan 8, 2016
    Last edited: Jan 9, 2016
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  2. bisco

    bisco cookie crumbler

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    tyres play a big part, but yes, sound dampening in the doors, floorboards and hatch make a big difference.
     
  3. double-i

    double-i New Member

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    I am in the process of adding the sound deadening material to my prius. The spots that made the biggest difference was the trunk (including the side panels around wheels) and all 4 doors. When you do the doors make sure you get the round impact bars. I plan to do the floor and roof.
     
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  4. VovCA

    VovCA Member

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    Could you please make some pictures, and give us other useful links which you use for your dyi.

    I think it's a good idea have objective measuring before and sound proof projects (tires change etc.). The experiment is quite repeatable (although we cannot control wind). We can always go on same freeway and drive let say 72mph for 5 miles, and make measuring. App is simple reset/pause also see graph and average.
     
  5. wjtracy

    wjtracy Senior Member

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    I like the Decibel10 app for iphone but I have not tried it for the car.
     
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  6. double-i

    double-i New Member

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    Once I finish the rear doors and under / around battery at the end of the week I will post some shots. Let me know what app you want me to use to measure the sound and I will download it to my iphone. I can do the recording next weekend.
     
  7. VovCA

    VovCA Member

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    App's name is Sound Meter. I tried Sound Meter Pro first, but dB indication is too small. I wanted to see it when I drive.
     
  8. bisco

    bisco cookie crumbler

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    there are some existing sound proofing threads here with great pics and write ups.
     
  9. winglik

    winglik Junior Member

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    Getting better tires is much better solution than sound proofing. I replaced all 4 tires and then do to sound proofing early last year. The road noise drops dramatically. but 2 months ago, I replaced to a lightly used 17" Rim and tires. the 17" tires are noise as hell and pretty much makes the sound proofing not existed. Changing the tires is so much less work and even costs less.
     
  10. VicD

    VicD Junior Member

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    Damn, you must be driving on some quietest road. I have just got new tires, Michelin X Ice 3, sound proofing on the door, and cargo and spare wheel well area, and when i drive 70mph, i got 75-78dB.
    Before, sound deadening, i can't even get 75dB at 70mph.

    On the same road, even a Volvo V60 read 73-75dB at 70mph.

    I used Decibel 10th on iPhone.
     
  11. Dealeo

    Dealeo Junior Member

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    Well at least we are all way ahead of a 1967 VW bus at 116 DB at 65 mph
     
  12. VovCA

    VovCA Member

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    May be your measurement more precise. iOS doesn't run too many phones with different hw. I used on app Nexus 5, although it is google phone. I think it would be interesting to run both apps together and see.
     
  13. VovCA

    VovCA Member

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    Wow, it must be feels like 100 mph!
     
  14. VovCA

    VovCA Member

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    Yes, you right. I'm not so deep into it, I'll go after low hanging fruits, trunk and tires.
     
  15. jdcollins5

    jdcollins5 Senior Member

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    I used the Decibel 10th on my iPhone. This morning it was about 34F and the decibel was 75-78 at 65 mph.

    This afternoon it was 55F and the return trip was 62-65 at 65 mph.

    So apparently temperature makes a big difference.
     
  16. VovCA

    VovCA Member

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    Interesting, i'm in San Francisco Bay Area, so 55-60F is quite common for winter.
     
  17. VicD

    VicD Junior Member

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    I doubt it's the temp, it's more likely whether you are driving against the wind or In a crosswind situation. I notice this all the time, the same road, back and forth is different because of the wind direction is diff. Heading and crosswind are the worst case.


    iPhone ?
     
  18. VovCA

    VovCA Member

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    Yes, tail/head wind can make a difference. As derivation ICE works with different tempo. I'm not sure that wind by itself a big component in the noise. On temperature, when 44F, a lot plastic makes displeasing noises, but sound insolation may be should not be effected. Can it be a tire pressure cause different ride, too?
     
  19. jdcollins5

    jdcollins5 Senior Member

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    There was no wind to speak of that day. I cross two rivers on my morning commute and both were slick as glass. That was when the dB was the highest.

    On the afternoon commute I also pass a recreation park with an American Flag flying. It was pretty limp that afternoon.

    I think it has everything to do with the cold temps, cold tires and cold asphalt.
     
  20. VicD

    VicD Junior Member

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    the only thing i can think of regarding temp is when its warmer, the tires got warmer, which the rubber compound got softer, and ride better.

    And also, another thing is sound level is based off pressure, but i doubt the colder temp would cause the pressure diff that much to read that much off in dB.

    I am an automotive tester, and i have never heard one day of forecast that it is 0mph of wind. even its calm, it's always something.
     
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