Does the winter weather increase exhaust drone? Increase power? - Page 3
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This is a discussion on Does the winter weather increase exhaust drone? Increase power? within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Check out this android app if you want to play with how temperature affects the speed of sound. Speed of ...

  1. #31
    Registered User dan5505's Avatar
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    Check out this android app if you want to play with how temperature affects the speed of sound.

    Speed of Sound Calculator

    I have the equation somewhere if anyone is interested.

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  3. #32
    Administrator RayfieldsWRX's Avatar
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    V= 331m/s + (0.6m/s/C * T)
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  4. #33
    Registered User wrx650's Avatar
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    Does the winter weather increase exhaust drone? Increase power?

    Quote Originally Posted by RayfieldsWRX View Post
    The difference in what? The frequencies should be the same, simply traveling to your ear in a time that is 4% less.

    Let's say that the distance from your ear to the exhaust system is about 3 meters. (It's probably less, but I'll err towards what you're saying) The difference from 30 degrees versus 70 degrees means that the sound would reach your ear in 8.7 msec, versus 9.1 msec. I don't see why it would make a difference in what you hear. Are you referring to some other phenomenon?

    Resonance makes much more sense, to me.
    Resonance does seem to be most likely. Also the different materials are more brittle at lower temperatures and probably don't absorb the sound waves as well. More sound through more noise. Idk maybe.


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  5. #34
    Registered User dan5505's Avatar
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    Quote Originally Posted by RayfieldsWRX View Post
    V= 331m/s + (0.6m/s/C * T)
    For that app, I believe I used this form for an ideal gas:

    a = sqrt(γ*R*T)

    where
    a = speed of sound
    γ = heat capacity ratio (Cp/Cv)
    R = universal gas constant/molar mass (R/M)
    T = absolute temperature in kelvin

  6. #35
    Registered User CharlieBronson08's Avatar
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    Quote Originally Posted by Eric05mx View Post
    I haven't noticed more drone with the cold temps but noticed more drone if I have 2-3 people in the car.
    This is definitely true. There is more drone with people in the car or even if I have stuff in the hatch. I wonder why that is?

    Also, sounds like overall that cold air may increase vibration/resonance/sound a little. But definitely increases power. Is there a calculator out there for the power increase with a given temperature?

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