Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Z20LET Whistling Sound

  
  1. #1
    Status
    Offline
    deono's Avatar
    AOC Newbie
    Join Date
    Sep 2006
    Posts
    16
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Z20LET Whistling Sound

    Howdy,

    Got a Astra-G Z20LET, it makes a whistling sound when you're on part throttle (about 1/2 to 3/4) so I'm thinking its related to the blow off of unused air. It doesn't make this sound when you're driving without boosting too much or when you're FLOORING it. I've checked the boost lines at the back of the engine and they seem intact.

    Also I should mention I've got a very agressive exhaust (freeflow) and intake system (1.9 debaffled airbox and Vectra intake) as well as a FMIC. Turbo and map are standard.

    Car goes perfectly and there are no error codes.

    Anyone else experience such a noise on part throttle?

  2. #2
    Status
    Offline
    spinner's Avatar
    AOC Fanatic
    Join Date
    Dec 2008
    Posts
    522
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    yeh mine does the same always has done probbebly because of ure air box you can hear it more

  3. #3
    Status
    Offline
    deono's Avatar
    AOC Newbie
    Join Date
    Sep 2006
    Posts
    16
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Cool, thanks for the feedback.

  4. #4
    Status
    Offline
    KevT.'s Avatar
    Yorkshire RO
    Join Date
    Jul 2005
    Location
    Bradford
    Posts
    9,218
    Mentioned in
    7 Post(s)
    Quoted
    15 Post(s)
    mine makes this noise but on full throttle and its the turbo spinning up and whining because its shouldnt be taking what it is!

    AOC top 15 car at PVS 2009 & 2010
    313.7bhp/343Ibft


  5. #5
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Turbo spooling.

  6. #6
    Status
    Offline
    Mr Sexman's Avatar
    AOC Regular
    Join Date
    May 2009
    Posts
    99
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    when i bought my coupe it was whistling loads when on boost and when i changed the exhaust system the previous owner had put a 1.8 back box on it and the step down in bore caused it to whistle as it still did it when i had a new turbo fitted but the min i changed exhaust it didnt do it anymore

  7. #7
    Status
    Offline
    smithy874's Avatar
    AOC Newbie
    Join Date
    Jan 2010
    Posts
    28
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    mine done the same and the bearings collapsed in the turbo

  8. #8
    Status
    Offline
    Rainey88's Avatar
    AOC Fanatic
    Join Date
    Nov 2009
    Location
    Scarborough, North Yorks
    Posts
    890
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    How would you know if the bearing was going? someone mentioned about mine being quite loud the other day ?

  9. #9
    Status
    Offline
    mobile's Avatar
    AOC Newbie
    Join Date
    Aug 2008
    Posts
    36
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    the mrs' is quite loud whistling as well but noticed the other day that one of the dump vlave mounting bolts was not tightened up and could see a gap between turbo and dumpvalve, didnt have allen keys with me so havent tried tifghtening it up yet, please tell me this isnt normal

  10. #10
    Status
    Offline
    K1ngsteve888's Avatar
    AOC Regular
    Join Date
    Jul 2007
    Posts
    277
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by deono View Post
    Howdy,

    Got a Astra-G Z20LET, it makes a whistling sound when you're on part throttle (about 1/2 to 3/4) so I'm thinking its related to the blow off of unused air. It doesn't make this sound when you're driving without boosting too much or when you're FLOORING it. I've checked the boost lines at the back of the engine and they seem intact.

    Also I should mention I've got a very agressive exhaust (freeflow) and intake system (1.9 debaffled airbox and Vectra intake) as well as a FMIC. Turbo and map are standard.

    Car goes perfectly and there are no error codes.

    Anyone else experience such a noise on part throttle?
    have you got a dump valve fitted? i had a whistling sound on mines turned out it was the baileys valve leaking boost.
    888 Coupe No: 33/100: Vxr Engine, 3" Turbo Back Exhaust, Regal Inlet Cam, Hi-Flow Inlet Manifold, 1.9 CDTI Airbox, Dbilas Airscoop, Courts FMIC, Courts Fuel Pump, Forge Recirc, Full Polybushed (Front & Rear), 888Dan Droplinks, Whitline RARB, 888Dan Aircon Delete, Double Core Radiator, Carbon Fibre bonnet, Alcon 4 Pots, Yoko AD08 Tyres

Page 1 of 2 12 LastLast

Similar Threads

  1. Whistling sound
    By daz16v in forum Turbo Petrol Engines inc. Transmissions
    Replies: 4
    Last Post: 15-02-2007, 19:12
  2. Whistling sound
    By daz16v in forum Turbo Petrol Engines inc. Transmissions
    Replies: 1
    Last Post: 24-01-2007, 23:48

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •