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

Thread: best type and place for a dump valve on a Z20LET?

  
  1. #1
    Status
    Offline
    C9SRi's Avatar
    AOC Obsessed
    Join Date
    Oct 2005
    Posts
    1,694
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Question best type and place for a dump valve on a Z20LET?

    whats the best type of dump valve to get for a standard z20let?
    and where the best place to get one from... would need to be with a fitting kit aswell...?
    Star Silver Astra Coupe Turbo

  2. #2
    Status
    Offline
    jalfrezigazee's Avatar
    AOC Obsessed
    Join Date
    Aug 2006
    Posts
    3,102
    Mentioned in
    1 Post(s)
    Quoted
    0 Post(s)
    best type is the cheapest you can get your hands on as you will probably take it off and sell it soon after due to problems on the car
    Be Happy


  3. #3
    Status
    Offline
    Rhino_GSi's Avatar
    AOC Regular
    Join Date
    Nov 2006
    Posts
    149
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    problems like what?!
    Arden Blue VXR, Sat Nav, Climate, IDS+, 19"'s, AFL Xenons, Bluetooth, Keyless entry and push button start!

  4. #4
    Status
    Offline
    Gary_Lawton's Avatar
    AOC Regular
    Join Date
    Feb 2008
    Posts
    142
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    The loudest one is a Blitz item, the is a fitting guide for the blitz one on zlet.co.uk. But if you can't afford one of those either a Bailey dv26 or dv36(trumpet type) will work fine and come with a fitting kit if purchased from the likes of LMF.

    Problem wise, the car can get a little jumpy when you ease off the power as the valve can vent too much air and cause the engine to cough slightly. Ive seen some people continue to run the standard recirculating one as well, rather than replacing the spring withe the spacer supplied in the fitting kit. But this means the dump valve wont be as loud.
    Astra Coupe Turbo - *LawtoSport Stage 3*

  5. #5
    Status
    Offline
    NickW's Avatar
    AOC Obsessed
    Join Date
    Jan 2008
    Location
    London, United Kingdom, United Kingdom
    Posts
    1,657
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    I'd keep the standard valve on as surely a recirc valve will be much better performance wise as its dumping air back into the system and turbo quicker, hence less spool of the turbo and more boost when ever you change gear as the pressure is almost already there. Less waiting time for power

  6. #6
    Status
    Offline
    Enkidu's Avatar
    AOC Obsessed
    Join Date
    Feb 2006
    Posts
    2,716
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Thing is the ECU measures volume of air coming through the AFM.... The standard valve recirculates the air back to after the AFM meaning the air stays in the system as its been measured. You fit a Chavalve and it dumps air to atmo, the ecu dont know where this has gone and mixture goes out...
    Arden Astra GSI - Phase 3.5

    EDS Phase 3.5 288 BHP 340 FT/LB

    Inlet cam and Dbilas manifold.

  7. #7
    Status
    Offline
    montyfox's Avatar
    AOC Obsessed
    Join Date
    Apr 2006
    Posts
    7,434
    Mentioned in
    1 Post(s)
    Quoted
    1 Post(s)
    The fitting kit required is

    just open the lid, pop the dump valve inside (its so easy, you don't even have to open the packaging) and replace lid. No tools, training or spacer kit required

  8. #8
    Status
    Offline
    NickW's Avatar
    AOC Obsessed
    Join Date
    Jan 2008
    Location
    London, United Kingdom, United Kingdom
    Posts
    1,657
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    My Golf GTI used to have a recirc dump valve but you used to be able to buy a valve from Forge, like this one

    The Splitter, a Recirculation and Blow Off Valve

    and also relocate it to the cold side of the engine, not sure if that would work on the Z20LET, but still, you can see where i'm coming from. There maybe a valve out there that does both like the one above


    After reading the forge page, it does not specify a make or model of car. So maybe its universal. Give them a call mate

  9. #9
    Status
    Offline
    NickW's Avatar
    AOC Obsessed
    Join Date
    Jan 2008
    Location
    London, United Kingdom, United Kingdom
    Posts
    1,657
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by montyfox View Post
    Stop dumping stuff in my bins, told you once already. THERE MY BINS






    soz

  10. #10
    Status
    Offline
    Turbo_Scott's Avatar
    AOC Obsessed
    Join Date
    Oct 2004
    Posts
    11,474
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by jalfrezigazee View Post
    best type is the cheapest you can get your hands on as you will probably take it off and sell it soon after due to problems on the car
    3 1/2 years of Astra Coupe Turbo & 888 ownership and never had one problem with dump valves on either car and they were fitted straight away to both cars. Both have ran a Bailey DV26-D and anyone whos been in my car will agree that its not lumpy, jumpy, erratic and I also know it hasnt gained a flat spot or lost power.

    For a technical advisor, I thought your comment would be more constructive.
    Fastest, Most Powerful & Only Mag Featured Astra In The AOC Cumbrian Region

Page 1 of 2 12 LastLast

Similar Threads

  1. Is there more than 1 type of group A collins dump valve??
    By D4nnyGsi in forum Turbo Petrol Engines inc. Transmissions
    Replies: 5
    Last Post: 12-02-2010, 21:41

Posting Permissions

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