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

Dump Valve vs Diverter valve

Discussion in 'A3/S3 Forum (8L Chassis)' started by dannyh, Jun 29, 2010.

  1. dannyh
    Offline

    dannyh Nogaro S3

    Joined:
    Jul 4, 2009
    Messages:
    787
    Likes Received:
    11
    [Jun 29, 2010]
    Ok i dont know much about dump / diverter valves so i hope you can help me.

    My 1.8 turbo is standard at the moment and i can hear the standard dump valve.

    I want this noise to be louder but i dont want it to be slower, i dont know how they work but would a diverter valve be better for the engine, would that make a noise

    Can someone help me because i dont know a lot as you can tell

    cheers
    #1
  2. Ads

    Ads

    [Sep 18, 2014]

  3. Westy
    Offline

    Westy Double Dark Side! Diesel & 8P

    Joined:
    Dec 2, 2008
    Messages:
    17,297
    Likes Received:
    971
    [Jun 29, 2010]
    The diverter (or recirc) vave will put the boost pressure back into the systemm to aid the turbo spool up. A dump valve dumps the boost pressure to atmosphere which is why you get a louder pisshhh noise. The ECU on the Audis is setup for a recirc valve and isn't happy when running a full dump valve. The alternative is to buy the forge valve which allows you to recirc some of the pressure and dump the rest so you get a bit of a louder sound but to be honest you're better off sticking with a decent recirc valve like the Forge 007P.
    #2
  4. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,916
    Likes Received:
    1,333
    [Jun 29, 2010]
    Buy a Forge 007p (or similar diverter) and a panel filter or suitable cone/CAI and you will hear the 'whoosh' a bit more.... 1.8t's are not designed to run atmospheric dump valves, they must be recirculating (diverter) otherwise it will lead to poor running of the engine... if you car is remapped this will increase the noise as there is more pressure to release...

    <tuffty/>
    #3
  5. Matt82
    Offline

    Matt82 Active Member

    Joined:
    Sep 7, 2009
    Messages:
    2,366
    Likes Received:
    2
    [Jun 29, 2010]
    and if you can hear the standard dump valve its likely to be broken.
    #4
  6. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,916
    Likes Received:
    1,333
    [Jun 29, 2010]
    If the noise you are hearing is a fluttering noise then yes...

    <tuffty/>
    #5
  7. sportstractor
    Offline

    sportstractor Chugger

    Joined:
    Nov 25, 2009
    Messages:
    2,715
    Likes Received:
    31
    [Jun 29, 2010]
    you could be a pikey and drill your airbox :eyebrows:

    Im a pikey so qualified to say that it works, draw backs being the possibility of drawing warmer air from engine bay, but meh. Would also add a pipercross panel filter in there or even just a new audi filter.
    #6
  8. mark_sarah
    Offline

    mark_sarah Limp mode!

    Joined:
    Nov 3, 2009
    Messages:
    203
    Likes Received:
    0
    [Jun 29, 2010]
    Mine was louder once i replaced my faulty standard DV with a Forge 007, i also mounted it with the vacuum pipe facing passenger side rather than upwards.
    Also became more audible when i fitted a pipercross panel filter.

    There was a Dump valve fitted to a 1.8T that i purchased a while back, and it ran like a bag of pooh. I binned it, and replaced it with a standard recirculating DV, and noticed a power incrase instantly.
    #7
  9. dannyh
    Offline

    dannyh Nogaro S3

    Joined:
    Jul 4, 2009
    Messages:
    787
    Likes Received:
    11
    [Jun 29, 2010]
    yes it is.

    Is this major?
    will it make the car loose power?
    #8
  10. <tuffty/>
    Offline

    <tuffty/> Badger 5 Edition Staff Member Moderator

    Joined:
    Sep 14, 2008
    Messages:
    15,916
    Likes Received:
    1,333
    [Jun 29, 2010]
    Assuming its a OEM DV then the diaphram has gone so needs to be replaced... as the pressure can't be released easily then the fluttering noise could be the onset of compressor stall which not a good thing on a little turbo like the K03/4 but I suspect the noise is just the poorly DV trying to do its job and can't...

    You will be loosing power as you will effectively have a boost leak....

    Replacement DV's such as the Forge won't give power but are serviceable and have a longer service life than the OEM ones... that said OEM are much cheaper and do the job just as well, they just wear out much sooner and don't look as bling :)

    <tuffty/>
    #9
  11. xCoupexAshx
    Offline

    xCoupexAshx All Torque

    Joined:
    Jun 4, 2010
    Messages:
    117
    Likes Received:
    0
    [Jun 30, 2010]
    sori to hijack, but my car is fluttering atm also, so i guess i should replace it? the forge 007p is bout 75 quid so i gathered, how much u lookin at for the oem one? is that the bosch one?

    ( again sori my knowledge of this is pants, i only know about renaults =p)
    #10
  12. S3-Oski
    Offline

    S3-Oski Member

    Joined:
    Nov 10, 2008
    Messages:
    484
    Likes Received:
    4
    [Jun 30, 2010]

    Hi mate i think they were £20-25 tops iirc, for the OEM and i think it is bosh,
    #11

Share This Page