[s-cars] By-pass valves

[Jared Robinson]

just realized this was suggested as the 710N valve.
I found this more readily by searching for the BPV for a 9-5 Aero though...
especially when it came to price. They were like $40 compared to trying to
get someone to source me the 710N valve.

On Sat, Sep 18, 2010 at 12:25 PM, Jared Robinson <chapel976 at gmail.com>wrote:

> May I suggest the BPV from a Saab 9-5 Aero. These are the same valves that
> MTM use. It's sometimes called the Bosch 110 Valve
> http://www.hoppenmotorsport.com/BoschBypass.htm
>
>
> On Thu, Aug 12, 2010 at 8:42 PM, Tony Curran <tony.curran at sympatico.ca>wrote:
>
>> Bypass valve analysis from S4 group...
>>
>> http://www.s4biturbo.com/art-dvtests.php
>>
>> http://www.s4biturbo.com/art-dvtests2.php
>>
>> Tony
>> 96 S6 with 034 bypass valve.
>>
>> -----Original Message-----
>> From: s-car-list-bounces at audifans.com
>> [mailto:s-car-list-bounces at audifans.com] On Behalf Of dgraber460 at aol.com
>> Sent: August 12, 2010 3:51 PM
>> To: captmagu at gmail.com
>> Cc: quattro at audifans.com; benswann at verizon.net; s-car-list at audifans.com
>> Subject: Re: [s-cars] By-pass valves
>>
>> Oh Yeah, now I remember reading that on the stall door at the truck stop.
>>
>>
>> Dennis
>> Denver
>>
>>
>>
>> -----Original Message-----
>> From: Hap Maguire <captmagu at gmail.com>
>> To: DGraber460 at aol.com
>> Cc: qshipq at aol.com; djdawson2 at aol.com; benswann at verizon.net;
>> esanborn at gmail.com; quattro at audifans.com; s-car-list at audifans.com
>> Sent: Thu, Aug 12, 2010 10:23 am
>> Subject: Re: [s-cars] By-pass valves
>>
>>
>> Hey Dennis
>> I've seen Dave Jones test a bypass valve by sucking on it. He is called
>> Tufty
>> or a very good reason.
>> Hap, wit dakine Tuftyism not from Evahboost, Maguire
>>
>> n Aug 12, 2010, at 4:10 AM, DGraber460 at aol.com wrote:
>> >
>>  Thanks Scott, Dave, et al;
>>  I understand the Bosch Audi OEM's operation pretty well as described by
>> Dave
>> nd Scott.
>>  Having said that, my question was, and is, should the OEM plastic valves
>> open
>> n the bench with vacuum applied to the small control port? The Forge
>> aluminum
>> alve does, but neither of my OEM plastic units will, and I hear what seems
>> to
>> e air bleeding by the diaphragm when vacuum is applied.
>>  They have never (at least in my ownership) been installed backwards, but
>> ondering if they need to replaced and tossed, or if they are as normal for
>> a
>>
>> tock OEM. I'm guessing from this behavior that the diaphragm is ruptured
>> and
>>
>> hey are toast?
>>  TIA
>>
>>  Dennis
>>  Denver
>>
>>
>>
>>  -----Original Message-----
>>  From: qshipq at aol.com
>>  To: djdawson2 at aol.com; benswann at verizon.net; esanborn at gmail.com;
>> graber460 at aol.com
>>  Cc: s-car-list at audifans.com; quattro at audifans.com
>>  Sent: Thu, Aug 12, 2010 7:36 am
>>  Subject: Re: [s-cars] By-pass valves
>>
>>
>>
>>
>>  Agree, many are mixing bypass valve operation with blow off valve.  I
>> have
>> not
>> een any bypass valve that boost helps 'blow open' from below.  Most (all
>> audi
>> pps) are oriented as DJD explains with the boost 90degrees to the
>> diaphram.
>>
>> he HKS sequensial bypass valve is oriented with the diaphram in line with
>> the
>> oost pressure.  However, it's operation is spring adjusted and operates as
>> a
>>
>> tepped  'needle valve', so it's still the feed line on the device that
>> dictates
>> alve opening and close.
>>
>>  A blow off valve oriented with the diaphram in line with boost pressure,
>> has
>> o intake feed, it is an absolute boost pressure device that pops when the
>> boost
>> n the intake manifold exceeds a set pressure.
>>
>>  Scott J
>>
>>
>>  -----Original Message-----
>>  From: djdawson2 at aol.com
>>  To: benswann at verizon.net; esanborn at gmail.com; dgraber460 at aol.com
>>  Cc: s-car-list at audifans.com; quattro at audifans.com
>>  Sent: Wed, Aug 11, 2010 11:20 pm
>>  Subject: Re: [s-cars] By-pass valves
>>
>>
>>
>>
>>  Mixing terms... and what you're saying isn't really accurate.
>>
>>
>>  The valve, is normally closed.  Apply a vacuum and it opens.  Apply boost
>> and
>> t
>>
>>  remains closed.  The signal comes from the intake manifold.  The intake
>> anifold
>>
>>  in a naturally aspirated engine is always in some state of vacuum.  This
>> means
>> >
>>  that if you are not making any boost, there will be a vacuum in the
>> intake...
>>
>>  inclining the BPV towards opening.
>>
>>
>>  Positive manifold pressure will NOT  "assist to force or blow the valve
>> open
>>
>>  when vacuum is applied to the control port" because those 2 things can't
>> ever
>>
>>  happen at the same time.  If there is pressure in the intake, there is
>> ressure
>>
>>  forcing the BPV to remain closed.  When there is vacuum in the intake,
>> there
>> s
>>
>>  vacuum at the BPV opening it up.  Furthermore, boost hits the *side* of
>> the
>>
>>
>>  piston (Forge) or diaphragm (Bosch)... never able to assist in opening
>> the
>>
>>  valve, unless you have it improperly installed.
>>
>>
>>  If as stock BPV is installed backwards, you will blow the diaphragm in
>> short
>>
>>  order... it's just rubber, and it won't last long fighting 20+ psi.
>>
>>
>>  The BPV's purpose is to alleviate pressure stall in the intake plumbing
>> (and
>>
>>  therefore the turbo) when the throttle closes.
>>
>>
>>  Anyway....
>>
>>
>>
>>
>>
>>
>>
>>
>>  -----Original Message-----
>>
>>  From: Ben Swann <benswann at verizon.net>
>>
>>  To: esanborn at gmail.com; dgraber460 at aol.com
>>
>>  Cc: 'Quattro List' <quattro at audifans.com>; s-car-list at audifans.com
>>
>>  Sent: Wed, Aug 11, 2010 6:51 pm
>>
>>  Subject: Re: [s-cars] By-pass valves
>>
>>
>>
>>  No, just the opposite.  The Bypass valve is normally closed.  The control
>> port
>> >
>>
>>  is vacuum
>>
>>
>>  actuated and tends to open the valve.  Positive manifold pressure will
>> assist
>> o
>>
>>
>>
>>  force
>>
>>
>>  or blow the valve open when vacuum is applied to the control port.  This
>> appens
>>
>>
>>
>>  only
>>
>>
>>  when the throttle valve snaps shut while engine is under positive
>> pressure
>> -
>>
>>
>>  like
>>
>>
>>  between shifts.
>>
>>
>>
>>
>>  So the mityvac test is not necessarily going to tell you if the valve is
>> pening
>>
>>
>>  properly and some valves have beefier springs for higher boost pressure.
>>
>>
>>
>>
>>  Also, if the valve is installed backwards then it may not open or flutter
>> when
>> >
>>
>>  opening,
>>
>>
>>  or open when it should not open.  Funny thing is the way most valve are
>>
>>
>>  oriented, the
>>
>>
>>  correct way does not look correct.  You  might want to verify that the
>> irection
>>
>>
>>
>>  of the
>>
>>
>>  valve is correct.
>>
>>
>>
>>
>>  See: http://www.gtquattro.com/Bypass-Valve.html that has a picture of
>> how
>> the
>>
>>
>>  valve is
>>
>>
>>  connected/oriented.
>>
>>
>>
>>
>>  Ben
>>
>>
>>
>>
>>  [Date: Wed, 11 Aug 2010 17:56:43 -0400
>>
>>
>>  From: Eric Sanborn <esanborn at gmail.com>
>>
>>
>>  Subject: Re: By-pass valves
>>
>>
>>  To: dgraber460 at aol.com
>>
>>
>>  Cc: s-car-list at audifans.com, quattro at audifans.com
>>
>>
>>  Message-ID:
>>
>>
>>    <AANLkTin-vkgjJaotOtbbX3ToE1Ab-yLvLzkJ2293n-xq at mail.gmail.com>
>>
>>
>>  Content-Type: text/plain; charset=ISO-8859-1
>>
>>
>>
>>
>>  I might be misunderstanding what you were testing, but they should only
>> open
>>
>>
>>  during boost.
>>
>>
>>
>>
>>  On Aug 11, 2010 5:12 PM, <dgraber460 at aol.com> wrote:
>>
>>
>>
>>
>>  List-et-al;
>>
>>
>>  I have been chasing a full throttle issue on my 3B'd URQ for a few months
>>
>>
>>  now. The symptoms have been a flattening and lack of power under full
>>
>>
>>  throttle. My boost gauge has always shown full boost at 19-20, and it
>> throws
>>
>>
>>  no codes. I started to notice the moaning (not whooshing) noise when off
>>
>>
>>  throttle, which I had heard before and found to be an aluminum bypass
>> valve
>>
>>
>>  that needed cleaning.
>>
>>
>>  Since it had been running an OEM Bosch plastic valve, I pulled the Forge
>>
>>
>>  valve off the S-Car and cleaned it up and installed it. On the drive this
>> AM
>>
>>
>>  it seems to have cured the issue. Time will tell if total cure.
>>
>>
>>  The question I have is that I tried to test all 3 valves that I have
>> while
>>
>>
>>  messing around last night. I have 2 plastic, and 1 Forge valve. I hooked
>> up
>>
>>
>>  a vacuum pump that pulls 14 lb hg to each valve individually and _none_
>> of
>>
>>
>>  them would pull open. Then I used my little Mighty Vac hand pump and the
>>
>>
>>  Forge valve would pull open and stay. Neither plastic OEM valve would
>> open
>>
>>
>>  with either test. Does this indicate both OEMs are toast?
>>
>>
>>  I assume the vacuum pump did not have a check valve and therefore could
>> not
>>
>>
>>  "build" vacuum as the Mighty Vac did, thus letting the valves flutter but
>>
>>
>>  not pull open. Sound reasoning?
>>
>>
>>  Also - is there a recommended lubricant that keeps the aluminum valves
>>
>>
>>  happy, and functional, or should they remain dry?
>>
>>
>>
>>
>>  Dennis
>>
>>
>>  Denver
>>
>>
>>  ]
>>
>>
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>>
>>
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>>
>>
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>>
>>
>>
>>
>>  =
>>
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>>
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>
>
>
> --
> Jared Robinson
>



-- 
Jared Robinson