Interesting sound on 2005 WRX
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This is a discussion on Interesting sound on 2005 WRX within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Purchased my wrx last week and I'm loving it. It makes one curious sound that I don't know what it ...

  1. #1
    Registered User ajsades's Avatar
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    Interesting sound on 2005 WRX

    Purchased my wrx last week and I'm loving it. It makes one curious sound that I don't know what it is.

    Iit sounds like a very quiet hissing. Almost like gas passing from one valve to another. It happens off and on during normal driving conditions. It happens during constant speed but has also happened during acceleration and deceleration.

    There is a clear difference between the sound of the turbo and this small almost faint hiss.

    Is this the work of the stock bpv?

    Thanks for the input, love the forums, such great information here!

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  3. #2
    Registered User rr1911's Avatar
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    at what speeds does it do this ?
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    Registered User ajsades's Avatar
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    normal speeds, was driving around 20-30 in a neighborhood

    it's hard to describe but it is a different sound than the turbo makes, very faint almost atmospheric gas like

    if no one can pin it down ill come back tomorrow with a better description.
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  5. #4
    Registered User rr1911's Avatar
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    is it during shifting ? or anytime while crusing ?
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  6. #5
    Registered User ajsades's Avatar
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    just normal steady speeds. I kept it on 25-30 or so
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  7. #6
    Registered User rr1911's Avatar
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    might just be air going into the hood scoop but im not sure
    i notice that im my cars but its usually at high speeds
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  8. #7
    Registered User ajsades's Avatar
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    hmmk, it could be air passing through the inter cooler. Just figured I'd check. I'll listen in and bring a better description tomorrow after I get to work.
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  9. #8
    Registered User rr1911's Avatar
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    Quote Originally Posted by ajsades View Post
    hmmk, it could be air passing through the inter cooler. Just figured I'd check. I'll listen in and bring a better description tomorrow after I get to work.
    ok sounds great man
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    You my friend might have a leak..

  11. #10
    Registered User wait3's Avatar
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    Do you have a boost gauge? Watch to see if it happens as you are rising/falling past the '0' mark (going in/out of vacuum). If so, you're probably hearing your wastegate actuator opening and closing. Sort of sounds like an extra fan on top of the normal turbo spool noise (high 'swishing'). It'll be louder with an aftermarket downpipe, catless or divorced wastegate design.

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    UnBanned Sinister's Avatar
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    do you have any aftermarket intake?
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  13. #12
    Registered User ajsades's Avatar
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    it's 100% stock

    I doubt that it is a leak in boost, while I haven't driven the car for that long, there is no lack of power. It pulls hard from start to finish.

    I don't have a boost gauge, should probably put that on my list of mods.

    Don't really have a better description of the sound, it really just sounds like air passing through a valve or hose (slightly metallic sounding).
    Last edited by ajsades; 09-26-2007 at 07:56 AM. Reason: left out information
    2005 WRX - "Bone me blue color"
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  14. #13
    Registered User ajsades's Avatar
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    so I found the sounds: it was the a/c doing it's job

    no harm no foul, thanks for the info guys!
    2005 WRX - "Bone me blue color"
    TBE Exhaust (Sickly sweet). Syn oil.

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