1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

My car whistles at me....

Discussion in 'A3/S3 Forum (8L Chassis)' started by Pete20vt, May 15, 2010.

  1. Pete20vt
    Offline

    Pete20vt Supermoto Junkie

    Joined:
    Apr 14, 2010
    Messages:
    121
    Likes Received:
    0
    [May 15, 2010]
    Since having the car mapped it whistles under load (4th or 5th), well its more like a quick sharp intake of air briefly at a certain boost level, it comes in very quick, and stops very quick too. Its not a spooling sound and it defo dosnt sound right, and i'm having a right nightmare finding it as it dosnt do it while stationary.

    I ran the car without an air filter and the whislte lastted longer so i'm thinking airbox/intake issue? Checked all the hoses and everything seems ok.

    Anyone else have this or know what it is?

    Only mods on the car are K&N panel and Custom-Code map.
    #1
  2. Ads

    Ads

    [Dec 27, 2014]

  3. voorhees
    Offline

    voorhees Moderator Staff Member Moderator

    Joined:
    Dec 18, 2005
    Messages:
    15,351
    Likes Received:
    1,317
  4. Broken Byzan
    Offline

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

    Joined:
    Apr 26, 2004
    Messages:
    12,778
    Likes Received:
    325
    [May 15, 2010]
    Its called Cavitation, if its the sound i think it is
    #3
  5. Pete20vt
    Offline

    Pete20vt Supermoto Junkie

    Joined:
    Apr 14, 2010
    Messages:
    121
    Likes Received:
    0
    [May 15, 2010]
    Don't know, why would the MAF make a noise?

    Care to elaborate?
    #4
  6. OllieH
    Offline

    OllieH Member

    Joined:
    Aug 27, 2009
    Messages:
    368
    Likes Received:
    0
    [May 15, 2010]
    Cavitation is turbulent air, where the turbo is trying to draw the air in quicker than the intake can supply it, so the airflow is no longer smooth, but becomes turbulent. Sounds abit like a squeel when the turbo is boosting up. Is quite normal for a remapped car.
    #5
  7. Pete20vt
    Offline

    Pete20vt Supermoto Junkie

    Joined:
    Apr 14, 2010
    Messages:
    121
    Likes Received:
    0
    [May 15, 2010]
    I see, i did try it briefly without an air filter at all (just an empty airbox) earlier though so there should have been plenty of air supplied to the turbo?
    #6
  8. Y83OLK
    Offline

    Y83OLK Hulk Smash!

    Joined:
    Sep 6, 2009
    Messages:
    841
    Likes Received:
    4
    [May 15, 2010]
    Cavitation can only occur in liquid though.

    Its commonly heard if you run you pas fluid low etc.
    #7
  9. Pete20vt
    Offline

    Pete20vt Supermoto Junkie

    Joined:
    Apr 14, 2010
    Messages:
    121
    Likes Received:
    0
    [May 16, 2010]
    Hmm, will check my fluid then :)
    #8
  10. Y83OLK
    Offline

    Y83OLK Hulk Smash!

    Joined:
    Sep 6, 2009
    Messages:
    841
    Likes Received:
    4
    [May 16, 2010]
    I doubt fluid will cause your whistle though mate..
    Cavitations air bubbles in fluid, sounds like sucking pea's through a hose pipe.

    If youve recently had the remap... That'll be the sound you hear.
    4-5th on a hill or under load., Sound like darth vader breathing through a bean can???
    If so, its just air turbulence. nothing to worry about.
    #9
  11. Pete20vt
    Offline

    Pete20vt Supermoto Junkie

    Joined:
    Apr 14, 2010
    Messages:
    121
    Likes Received:
    0
    [May 16, 2010]
    Its just nothing i've heard before on a 1.8T, just seems a little odd.
    #10

Share This Page