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

' turbo flutter ' ?

Discussion in 'A3/S3 Forum (8L Chassis)' started by jamieA3, Jul 19, 2012.

  1. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    evening all, since buying my 1.8 t a few weeks ago. I have noticed that when i release the throtle i hear a noise from the front thats sounds like :uhm: a bird cooo. Wasnt sure what it was as ive never had a tubro charged car before. after reading online and watching videos on youtube i believe the noise is commonly refered to as turbo flutter.

    anyway, is this a sign that my bov is faulty as im getting some mixed answers though google ect. some say its the DV. Whats the difference ? ( complete turbo newby ) :huh:

    anyway, maybe this noise is normal, maybe not but anyone with an idea of what to do/not do I iwill be very grateful.


    jamie
    #1
  2. Ads

    Ads

    [Sep 18, 2014]

  3. Prawn
    Online

    Prawn My other car is a MINI!!!!

    Joined:
    Dec 8, 2006
    Messages:
    9,579
    Likes Received:
    1,345
    [Jul 19, 2012]
    What you're hearing is called compressor stall mate, often refered to as 'flutter'

    it's down to the diaphram in your standard DV being split.

    BOV means Blow off valve, which your car shouldn't have fitted.

    it should instead have a diverter valve, or Recirculating dump valve, known as a recirc.

    You can either replace it with a new Bosch 710N part from audi for less than £30, or upgrade to a forge alloy piston type dump valve to avoid having another failling in the future for around £80.

    You'll also find the car drives better and fuel economy will increase as well with a new DV in place, as the current one is a constant leak in the boost system costing you power and efficiency.
    #2
  4. badger5
    Online

    badger5 www.badger5.co.uk Site Sponsor

    Joined:
    May 28, 2004
    Messages:
    7,331
    Likes Received:
    695
    [Jul 19, 2012]
    wot he said
    #3
  5. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    229
    Likes Received:
    3
    [Jul 19, 2012]
    check the small pipe ontop of the dump valve and make sure all associated pipes havent come off or are split. I tempereraly fitted a boost gauge to the pipe going to the dump valve which blew off after a bit of driving and caused this sound, connected the pipe back up and it went away.
    #4
  6. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,913
    Likes Received:
    1,333
    [Jul 19, 2012]
    That noise is typically down to the DV (dump valve) being faulty assuming you still have the original valve as they are prone to failure... the noise you are hearing is compressor stall and is generally bad for the turbo...

    DV = diverter valve... still technically a dump valve but doesn't vent to atmosphere like 'blow off' valves do... the ECU's fitted to these cars don't like atmos valves and you will end up with running problems using one... either buy a new OEM DV or if you fancy something else then the Forge 007p or 008p

    <tuffty/>
    #5
  7. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    thanks guys, ill just run the car like a grandad until i can get one.( below 2000 rpm ) would you all recomend a 007p from forge IE are there any gains to be had or is it just for noise.

    thanks again, jamie
    #6
  8. Grazam
    Offline

    Grazam Member

    Joined:
    Nov 13, 2011
    Messages:
    191
    Likes Received:
    2
    [Jul 19, 2012]
    I have recently fitted the 007p and my standard one is fine if you want it?
    #7
  9. Lavis89
    Offline

    Lavis89 Active Member

    Joined:
    Aug 18, 2011
    Messages:
    791
    Likes Received:
    137
    [Jul 19, 2012]
    if you've got the extra £20 - 30 handy you might as well pick up a FMDV008 (the new version of the 007p) i installed one today and am very happy with it, or if you're keeping it cheap, 007p, they are pretty bullet proof compared to the standard bosch valves that are very prone to splitting. not sure about power gains etc, i've only just started working on my car but i've heard it gives better thottle response

    EDIT: thats £20-30 more expensive than the 007p
    #8
  10. cjsuk
    Offline

    cjsuk Member

    Joined:
    Feb 18, 2012
    Messages:
    564
    Likes Received:
    81
    [Jul 19, 2012]
    pigeon syndrome is what I like to call it :) Do what's been said and you won't go wrong and spending that little more on a forge dv is a good idea like said :)
    #9
  11. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    well thanks you to all for the responses, ive inspected the dv. and hoses as far as i can see are ok. so im guessing its a internal fault or something i cant see. anyway, thanks again, ill fit a stock one for now as i am skint ( after buying the car last month )
    #10
  12. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

    Joined:
    Jan 30, 2008
    Messages:
    15,571
    Likes Received:
    313
    [Jul 19, 2012]
    Stock ones work fine on 600hp RS4's, and are fit and forget.

    Better choice IMO than some aftermarket part thats 3 times the price and requires "servicing"
    #11
  13. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    yeah i cant say whether or not aftermarket ones are better or worse, but I always wonder if many parts are better over the oem parts. I mean audi obviously research there stuff and know what there doing. on the other hand, many on these cars are pushing 15 years old, so technology has got to have improved since the mid 90s. anyway this is off topic lol
    #12
  14. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    ive inboxed you mate
    #13
  15. Gops
    Offline

    Gops 6th gear @7000rpm

    Joined:
    Nov 6, 2009
    Messages:
    2,641
    Likes Received:
    286
    [Jul 19, 2012]
    My007p gives me better response! Better than OEM!
    #14
  16. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 19, 2012]
    yeah i will be trying one when the wallet allows. until then ...
    #15
  17. S3_chris 11
    Offline

    S3_chris 11 Member

    Joined:
    Nov 14, 2011
    Messages:
    189
    Likes Received:
    2
    [Jul 21, 2012]
    S3 Turbo Chatter - YouTube

    mine sounds like this all the time even with all new pipes and a new forge 007 happened after stage 2 map
    #16
  18. Gregg1
    Offline

    Gregg1 New Member

    Joined:
    Jun 21, 2012
    Messages:
    1
    Likes Received:
    0
    [Jul 21, 2012]
    chris if im right in saying youll have a cone air filter? the chatter your hearing is through there, it will do it on a standard S3 but probably louder on yours with it being stage 2 :icon_thumright:
    #17
  19. S3_chris 11
    Offline

    S3_chris 11 Member

    Joined:
    Nov 14, 2011
    Messages:
    189
    Likes Received:
    2
    [Jul 21, 2012]
    yeah a rather large cone filter the biggest one u have probably seen, everyone kept saying that it was a bad sign but i wasnt sure.

    [​IMG]
    #18
  20. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 21, 2012]
    jesus is that from a hummer or a monster truck ? lol
    #19
    S3_chris 11 likes this.
  21. S3_chris 11
    Offline

    S3_chris 11 Member

    Joined:
    Nov 14, 2011
    Messages:
    189
    Likes Received:
    2
    [Jul 21, 2012]
    i got if off a guy that was breaking his s3 cost him £199 or something like that i got it from him for a bargain of £30
    #20
  22. jamieA3
    Offline

    jamieA3 Member

    Joined:
    Jun 30, 2012
    Messages:
    150
    Likes Received:
    3
    [Jul 21, 2012]
    lol seriously funny that. looks like it could run a diesel train! surely its too big though mate ?
    #21

Share This Page