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Thread: how to test a dump valve?

  1. #1
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    how to test a dump valve?

    I have a problem, when I put a standard recirculating valve on my car it chatters like its not opening and I've tried this with 2 but when I put a forge one one it sounds like its leaking under boost. How can I test them?

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  3. #2
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    The simplest way to test is to push the piston up by poking something through the bottom, then create a seal with your thumb over the top where the vac hose would go and see if the piston returns... If it does then it's buggered


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    +1

    Same way to test that was told

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    <tuffty/>'s Avatar
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    If the Forge one (assuming its a 007 or 008 and not the crappy split-r) has an o-ring on the bottom of the piston then it shouldn't leak at all under boost... if its a metal bottomed piston then get a service kit for around 15 quid that has the new design piston in or just buy a new OE valve

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    ...and there are two threads in the FAQs about DV's and testing stuff etc...

    <tuffty/>
    JD09 likes this.
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Quote Originally Posted by <tuffty/> View Post
    or just buy a new OE valve

    <tuffty/>
    I just did this... Goodbye old 007P. eGay here it comes!

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    My two OEM ones are still both making a hooting noise Stuck the leaking 007 back on for now

    This was me testing my 007

    2002 Audi S3 261bhp
    Miltec Exhaust, Badger5 TIP, Stage 1 Remap, 007P DV.

    Todo: Fit LCR Splitter, FMIC, Clean.

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    Quote Originally Posted by Eddie S3 View Post
    My two OEM ones are still both making a hooting noise Stuck the leaking 007 back on for now

    This was me testing my 007

    Is that not leaking from the pipe? Difficult angle to tell!

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    It was a while ago I recorded that but it was definitely leaking out of the bottom
    2002 Audi S3 261bhp
    Miltec Exhaust, Badger5 TIP, Stage 1 Remap, 007P DV.

    Todo: Fit LCR Splitter, FMIC, Clean.

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    Under how much pressure was that. And how long is that pressure on the dv? Is it constant while the turbos spinning? I know nothing about how this works im sure im going to look stupid here.

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    Pressure on the DV is there while 'on boost' dude... once throttle is closed then there is vacuum on the top that lifts the valve and release the pressure back into the TIP... if air is leaking past (as per the vid) thats air thats not getting to your engine and this equals power loss

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Wow thats just incredible. I think im going to sell my 007 and get an oem. Sound wise?

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    Forge have revised the piston so should no longer leak... get a service kit for 15 ish quid which includes piston, o-rings and grease and treat it...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    All 3 the piston drops as soon as I release it from pushing it up while blocking the vacuum end. I can blow through both the standard vacuum ends and hear it leaking. The forge one is a split r, I bought it before doing any research -.- lesson learnt

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    JUS3IN's Avatar
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    make sure they are on the right way round aswell lol!-)
    1999 apy s3, n249 delete, sai and n112 delete. bbs lm reps, s2000 filter, relentless v3 manifold, relentless downpipe and sports cat, scorpion cat back system, badger 5 v3 tip, bam rocker cover, push in coilpacks, toyosports fmic, amd remapped to 280.3 bhp and 263.9 lb/ft.

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    Which way around is the proper way?
    Ordered a standard DV from my local vw dealers today, only £37 including vat.

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    <tuffty/>'s Avatar
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    Quote Originally Posted by lol4fun View Post
    All 3 the piston drops as soon as I release it from pushing it up while blocking the vacuum end. I can blow through both the standard vacuum ends and hear it leaking. The forge one is a split r, I bought it before doing any research -.- lesson learnt
    Don't bother testing the split-r... they just leak... period!

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  19. #18
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    as you had a split r im thinking that had the vacuum pipe horozontal, the stock dv's are vertical as tuffty taught me lol... so on the stock the vacuum pipe points at the sky.
    lol4fun likes this.
    1999 apy s3, n249 delete, sai and n112 delete. bbs lm reps, s2000 filter, relentless v3 manifold, relentless downpipe and sports cat, scorpion cat back system, badger 5 v3 tip, bam rocker cover, push in coilpacks, toyosports fmic, amd remapped to 280.3 bhp and 263.9 lb/ft.

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    Thanks

 

 

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