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Interesting Dump Valve Information For New Buyers And Owners. Servicing Etc

Discussion in 'A3/S3 Forum (8L Chassis)' started by 16Klappe, Dec 3, 2012.

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  1. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    [Jan 2, 2013]
    Recently wen i cleaned my Forge DV and stripped and regreased it i noticed a very small stepped ring at the base of the piston... im guessing that will make it leak?
    To test it in water for a leak i need to preasurise the side of the dv? and the small pipe on the top to the same level? My car sounds like an externaly gated rally car if i lift off from part throttle ... spring? faulty DV? needs shimming? bad map?
    #81
  2. A3 T
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    A3 T Lord Of The Rings

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    [Jan 2, 2013]


    I remember a while back someone posted a good explanation on why you shouldn't run the DV like this but i cant remember the reason why .....lol

    I think it was one of tufftys posts :think:
    #82
  3. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Jan 2, 2013]
    if chirping DV aint opening at all or not fast enough
    #83
  4. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Jan 2, 2013]
    Bill im thinking of ditching my madmax dv and buying the newly rediisgned super sized forge valve, whats your thoughts on the forge one now forge have redone the piston and improved its sealing?
    #84
  5. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Jan 2, 2013]
    tufftys SS forge one sealed ok on bubble test
    his does not have the o ring piston
    #85
  6. camscockle20vT
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    camscockle20vT The stigs ugly brother

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    [Feb 15, 2013]
    This dump valve is verrrry filthy indeed, abit of spit and an old rag, elbow grease and some red lube did the trick nicely, [​IMG]

    Note that the seals where shot and grease was... Shall we say pissing out!
    [​IMG]

    Also the previous owner must of had the strength of a feild mouse, my 76 year old nan could of un done the dv with no problems, makes me laugh that people cant even refurb a 007p.
    #86
  7. JudderMan
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    JudderMan Active Member

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    [Feb 15, 2013]
    It's literally the easiest thing I've ever done. Did you get the new piston? Yours seems scored or is it just dirt?
    #87
  8. camscockle20vT
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    camscockle20vT The stigs ugly brother

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    [Feb 15, 2013]
    Yeh its scored slightley i suppose, just minute abrasion really, iv not seen a used piston without it.

    And no i just stuck with the old piston. I didnt have time to do the water and bucket test, but the finger and thumb jobbie sorted the men from the boys. Did this before and after to see how it preformed.

    I only cleaned it because i had abit of a lumpy idle on occasion, usually going from on boost to stand still, thought it may of been sticking open, but it was just out right shot. Feels alot better now though, no lumpy idle as of yet.
    #88
  9. AudiS3-Turbo
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    AudiS3-Turbo Member

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    [Feb 16, 2013]
    The only problem with the oem valve when used with b5 tip and jetex filter is the noise from it on light throttle, sounds like a trumpet, really annoying!
    #89
  10. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Feb 16, 2013]
    can you get a sound clip of this noise?
    #90
  11. AudiS3-Turbo
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    AudiS3-Turbo Member

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    [Feb 16, 2013]
    When I'm back home later this weekend I can and will upload it.
    #91
  12. paultownsend
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    paultownsend Member

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    [Feb 18, 2013]
    Well. My 28 day old TPS supplied 710n valve has started honking like road runner on light throttle. Sounds ridiculous. I'm sure it's not holding boost either.

    The thing is, I think my engine has too much vacuum at idle. -24HG.

    Thats why I sold my forge 008. With a green spring it wouldn't shut at low revs, and with a yellow it would make the blower chatter at high rev dump. Shims made no difference.

    Its only an AGU running a 185hp/220lbft map.

    I assume a high vacuum means there are no boost leaks?
    Does the PCV system have any effect on vacuum? As ATM I'm running a very crude system to atmosphere?
    #92
  13. Jason.s
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    Jason.s Active Member

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    [Feb 18, 2013]
    My standard 710n sounds like an owl with long hoots lol. Probably sounds like both the above posts its just hard to explain the sound. It must only have like 1500-2000miles on it. Did the n249 bypass at the weekend and now it does it all the time. Even longer and the slightest tiniest lift off the throttle and it does it. When cruising at any sort of speed 50/60/70/80 if you hold that speed steady it will do it as you`re foot is always moving the pedal from road bumps and dips. Have ordered another valve so going to try that tomorrow and see what happens.
    #93
  14. Jason.s
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    Jason.s Active Member

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    [Feb 18, 2013]
    http://img.photobucket.com/albums/v...E0C8F15-5190-000007A4796B3C02_zps5faa5cc5.mp4

    not the best but it was quick on the way home and kind of demonstrates the noise. Can't really be bothered to go out with the go-pro to show it better lol. It's not doing it as much as it was this morning or yesterday but probably needed to be going faster as that video was at 50ish. Higher speed is much longer and heavier acceleration and pedal release it does it when changing gear too now since the n249 bypass.
    Last edited: Feb 18, 2013
    #94
  15. paultownsend
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    paultownsend Member

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    [Feb 18, 2013]
    Yes mine is similar, but more of a honk. Coming off lights throttle, lower revs. Grr!
    Il whip the valve off tomorrow to see if its leaking.
    #95
  16. JudderMan
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    JudderMan Active Member

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    [Feb 18, 2013]
    Get onto Forge and get a new piston. I got mine for free as I bought the 007p in December and it started leaking a few weeks ago. Fit the new piston and it's spot on. No chirps.

    Those that are honking like a goose I reckon you've bust the diaphragm. Get a new one. I'm sure Bill mentioned that they've changed suppliers and the new OEM ones aren't made by Bosch (not that it should make any difference) but they're cheap enough to replace.
    #96
  17. paultownsend
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    paultownsend Member

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    [Feb 18, 2013]
    The valve is from the new supplier and only 28 days old :(
    #97
  18. AudiS3-Turbo
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    AudiS3-Turbo Member

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    [Feb 18, 2013]
    they dont leak,its just a noise they make when its on light boost on low vacume... annoying

    **** vid of the noise,difficult to hear with the phone but you should hear it.


    [​IMG]
    Last edited: Feb 18, 2013
    #98
  19. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    [Feb 19, 2013]
    that noise is very annoying i dont think i could put up with that on a daily basis.

    Well as my 007p is now running the new style piston and has been serviced so i thought i would try running with the green spring instead of the yellow for a bit. I also took the opportunity to replace the 4mm silicone pipe i used to do my n249 delete with some stronger 5mm braided hose as i was a tad concerned that the silicone was compressing under pressure as it does not have much strength really. The new hose is much tougher to squash between your fingers so i think it should do the job nicely.
    #99
  20. paultownsend
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    paultownsend Member

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    [Feb 19, 2013]
    HONK HONK! HONK HONK!

    well i took off the new 710N valve today. i kept the silicone hose attached and had a quick suck. holds pressure perfectly. also tried blowing the side port and it wouldn't pass air for the life of me.

    like the post above i don't trust silicone not to collapse under vacuum, so i used some thick walled 3mm ID clear PVC hose. piped back to my boost valve also as i had some hissing behind the dash. silicone is so easy to nip.
    it's still honking like roadrunner.

    i assume its just the diaphragm wobbling when going from vacuum to boost. annoying when your going up hill part throttle.

    it still cant be normal. iv never known another 1.8t to do it.
  21. Jason.s
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    Jason.s Active Member

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    [Feb 19, 2013]
    That second video is pretty much what mine does yeah. Got a new valve today so i`ll try that when i get home. Doesnt sound like its going to cure it though :(
  22. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 19, 2013]
    Silicon is better than PVC tube period as it will naturally spring back to its extruded (round) state once hot and if there is enough vacuum to close it up... PVC tube will collapse much sooner under heat and most PVC tubing installations I have seen have melted or fused flat once cooled down...

    Small bore silicon vacuum tube would take more vacuum than the engine is capable of to collapse... for larger bore stuff (8mm and above realistically) use proper layered silicon hose...

    <tuffty/>
  23. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    [Feb 19, 2013]
    Have you got another DV you can try on the car to see if its any different?
  24. Jason.s
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    Jason.s Active Member

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    [Feb 19, 2013]
    Just fitted another new standard valve. Noticed the one I took off that I fitted back in October was one of the new branded valves so doesn't look promising that it'll sort it. Will see what it's like in the morning on the way to work.

    I think its either going to be live with the hugely annoying noise which I don't think I can or buy a forge with new service kit :(
  25. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    [Feb 19, 2013]
    look in the classifieds as for some reason there are quite a few second hand 007p`s for sale lol

    get one as cheap as poss and then just get the service kit from forge with the new piston job done :)
  26. paultownsend
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    paultownsend Member

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    [Feb 19, 2013]
    that's me told :yum: good job i kept the old silicone!

    as the current valve is only a month old, i may ask TPS for a replacement....
  27. S3quatt
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    S3quatt Flat Oot like a ducks Foot

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    [Feb 19, 2013]
    Agreed on this!

    OE one's cant leak unless the diaphragm is burst then it would be obvious there was a problem.

    I have a forge one in a box at the back of the garage some place & went back to the OE valve, as it reacts as it should do.

    My feeling is that for the forge valves to be 100% leak free, the 'O' rings would have to be thicker to create a proper seal, which in turn would be too stiff to react properly.
  28. S3quatt
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    S3quatt Flat Oot like a ducks Foot

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    [Feb 19, 2013]

    Corrected that for you ;)
  29. Jason.s
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    Jason.s Active Member

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    [Feb 20, 2013]
    Well the drive to work was no different. Brand new valve same noise. So yeah as i mentioned further up its either live with it or get an aftermarket valve :(
  30. vanilla_ice
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    vanilla_ice Member

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    [Feb 20, 2013]
    Do this. I considered going back to OEM, but tried the new piston design. Now my car pulls noticeably (no logs) 'stronger' in the mid-to-high rev range.

    I guess my original piston wasn't seated properly as it only had a thin band around where it closes against the main body of the valve.
  31. Eddie S3
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    Eddie S3 Member

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    [Feb 20, 2013]
    Thanks to this thread ive gone back to my OEM one!
    007p is just over a year old I think


    excuse the music (it was radio1..honest :) )

    Edit: Just been for a drive and the oem one is now making that hooting noise people have posted about
    Last edited by a moderator: Aug 15, 2014
  32. Jason.s
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    Jason.s Active Member

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    [Feb 20, 2013]
    Anyone got an old Bosch 710n laying about they could try? Incase its maybe the new kayser branded valves causing it? Unless anyone in this thread that's reporting the noise is using an older valve
  33. David_8
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    David_8 New Member

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    [Feb 20, 2013]
    Greetings from Briskoda.

    Joined up just to post this, been reading this thread today, very interesting.

    I got home and thought I should check mine.

    [​IMG]
    [​IMG]
    [​IMG]

    I only cleaned it a few months ago so I guess the seals are shot.
    Been having a few running issues lately so we'll see if this helps
    I've dug out my OE Bosch job and fitted that back on after reading all this, I'll let you know how it feels in the morning.
  34. 16Klappe
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    16Klappe RacecaR forward is RacecaR backwards. Supporter

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    [Feb 26, 2013]
    Welcome to the site.

    How did you find the OE valve?
  35. [Dave B]
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    [Dave B] Daddy

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    [Feb 26, 2013]
    I test fitted a Kayser valve last week, it farted like a trooper so I refitted my 008p with a green spring.
  36. David_8
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    David_8 New Member

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    [Feb 26, 2013]

    Engine feels smoother through the revs, no so much of an on/off switch feel too it if that makes sense. And of course it's a little quieter which at my age is not a bad thing !!

    Edit... It's the original valve which the car came with, about 10 years old, mind I've had the forge on for about 6 yrs
  37. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Feb 26, 2013]
    it did what?

    I'll fit mine to the lupo now to see...
    fart sound, lol

    mrsb will luv that!

    not!
  38. Jason.s
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    Jason.s Active Member

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    [Feb 26, 2013]
    It makes the identical sound pretty much like when you blow over the top of a beer bottle and it makes that whistling sound.
  39. [Dave B]
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    [Dave B] Daddy

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    [Feb 26, 2013]
    I found it most prominent at part throttle holding about 3k rpm, that's when she tended to let rip.
  40. Jason.s
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    Jason.s Active Member

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    [Feb 26, 2013]
    Sounds about right yeah.
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