Monster MotorsportJMB Retrofits
Results 1 to 6 of 6

Thread: Wasted boost

  1. #1
    g60leigh's Avatar
    5th Gear

    Status
    Online
    Join Date
    Jun 2007
    Location
    Stockton on Tees
    Posts
    1,389

    Wasted boost

    may be a really daft question this one, but......
    now I have fitted an induction kit I can hear my DV. when running slowly through the rev range I can hear it purging boost. (@ about 5psi)
    is there any point in adjusting my DV spring or is it supposed to be doing this for a vital reason?

    If I should change, any idea which spring to use?

    2001 S3 (AMK)
    AEM WMI Kit, Black Silicone Hoses, Badger5 TIP with Cone Filter, AH Fabrications FMIC, Relentless Manifold Downpipe & Sport Cat, Miltek Cat Back Exhaust, VAG Aero Wipers, Forge FMDV008 Re-Circ, Revo Stage 2 Remap with SPS+ Tweaks, 2.0 TFSI Coil Pack Mod, B&M Short Shift, RNS-D Retrofit, Brembo & B5 2 Piece Rotor Conversion

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    hiltoa's Avatar
    VAG erfahren

    Status
    Offline
    Join Date
    Jul 2006
    Location
    on the edge
    Posts
    299
    Is this not what the N75 valve controls to smooth out boost delivery?
    Nothing feels fast for long...

    2004 Audi Allroad 2.5 TDI L.E.
    Ebony Black.
    1991 VW Golf GTI 16v
    Tornado rot.

  4. #3
    jcb
    6th Gear

    Status
    Offline
    Join Date
    Sep 2005
    Location
    uk
    Posts
    4,077
    how do you know it is purging boost?

  5. #4
    g60leigh's Avatar
    5th Gear

    Status
    Online
    Join Date
    Jun 2007
    Location
    Stockton on Tees
    Posts
    1,389
    Quote Originally Posted by jcb View Post
    how do you know it is purging boost?
    I can hear the hiss now through the cone filter when gently accelerating and the boost gauge shows 5 psi
    if I boot it I run aprox 13-15psi
    Last edited by g60leigh; 30th June 2008 at 20:58.

    2001 S3 (AMK)
    AEM WMI Kit, Black Silicone Hoses, Badger5 TIP with Cone Filter, AH Fabrications FMIC, Relentless Manifold Downpipe & Sport Cat, Miltek Cat Back Exhaust, VAG Aero Wipers, Forge FMDV008 Re-Circ, Revo Stage 2 Remap with SPS+ Tweaks, 2.0 TFSI Coil Pack Mod, B&M Short Shift, RNS-D Retrofit, Brembo & B5 2 Piece Rotor Conversion

  6. #5
    "Stick a V8 in it!"

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    15,372
    would seem to me that its just doing its job...

    You have positive pressure and a closed throttle butterfly, you either dump the air thru the valve or you dont and stall out the compressor.

    You might find that the turbo would be fine handling 5psi without the dump valve, but then again they are pretty puny things and i guess they have just specced the valve to be safe

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  7. #6
    g60leigh's Avatar
    5th Gear

    Status
    Online
    Join Date
    Jun 2007
    Location
    Stockton on Tees
    Posts
    1,389
    ok best leave things alone before I break something then

    2001 S3 (AMK)
    AEM WMI Kit, Black Silicone Hoses, Badger5 TIP with Cone Filter, AH Fabrications FMIC, Relentless Manifold Downpipe & Sport Cat, Miltek Cat Back Exhaust, VAG Aero Wipers, Forge FMDV008 Re-Circ, Revo Stage 2 Remap with SPS+ Tweaks, 2.0 TFSI Coil Pack Mod, B&M Short Shift, RNS-D Retrofit, Brembo & B5 2 Piece Rotor Conversion

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO