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Engine Sounds

Discussion in 'General Tech and Maintenance' started by guitarjon, Jan 9, 2004.

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  1. guitarjon

    guitarjon Junior Member

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    What makes the high-pitched air sound from an engine? I'm talking about when you have somebody with a tuned out engine, and when they shift, it makes a high-pitched air "squeak', I guess you could say. There was a WRX I saw on the road a while ago, and it made that sound. Is it the hydraulic transmission?
     
  2. preludude

    preludude Member

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    You are talking about the blow off valve. Its an upgrade you make with a turbo. It dumps the air out of the turbo every time you shift and creates a high pitched "whoosh" noise. I think it's stock on wrx's and lancers though.

    I wish I had a turbo!!
     
  3. dohcvtec_accord

    dohcvtec_accord WRX Sellout

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    It's not an "upgrade" for a turbo, it's necessary. When the throttle plate closes during a shift or if you lift off the throttle while driving, the compressed air needs to go somewhere. If you don't have a blowoff valve, the air tries to force its way back into the turbo, which is, umm, a bad thing. On most stock turboed cars (WRX's, older Eclipses, etc), the air gets plumbed back into the intake manifold rather than into the atmosphere. A full or partial atmospheric venting blowoff valve is what makes the squeeking or whoosing noise. Or, if you remove various stock silencing mechanisms on a stock car (like mine), you can still hear a full plumb-back BOV.
     
  4. guitarjon

    guitarjon Junior Member

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    Excellent. Is there any way I could do the same to my 99 Civic EX w/o having to purchase the turbo? What are the silencing mechanisms?
     
  5. dohcvtec_accord

    dohcvtec_accord WRX Sellout

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    Why would you want to do that? You're not turbo'ed, so there'd be no reason for your car to be making any sort of turbo-related noise.

    If you're REALLY into that, however, some companies sell an "N/A blowoff valve" that replicates that squeeking noise when it detects the throttle plate closing. Very expensive for a bogus noise, IMO.
     
  6. HatchSpeeD

    HatchSpeeD ...Hi...

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    :eek: ...Oh God, here we go...dohcvtec_accord...I give you a lot of credit bro.

    I give it 5 mins b4 flaming commences.
     
  7. K2e2vin

    K2e2vin Senior Member

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    the wastegate is a necessity, not a bov(some drag cars dont use bovs). but it is much better to have a bov.

    anyway if you just want the sound you might want to take this to another forum.
     
  8. EG6D16Z6_NA

    EG6D16Z6_NA Member

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    i have on a skunk2 IM, and everytime i take off the throttle, it has a swoosh. pretty kewl, but not anything like a BOV.
     
  9. DarkHand

    DarkHand Senior Member VIP

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    Me too, I thought you were going to be sarcastic later in the post and start talking about muffler bearings and blinker fluid. :)

    We've all got to start somewhere!
     
  10. sportlinecrx

    sportlinecrx Banned

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    You can search Ebay for devices that make your car sound like it has a wastegate/turbo.

    Pointless thread. Locked.

    :locked2:
     
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