[s-cars] Bypass Valves and Pressure Losses (Uh, Pizzo??)

[Joseph Pizzimenti]

Gary,
Don't try to understand it.  Just make it so that
boost faces the side of the piston and you'll be fine.

Just be grateful you don't have to weld any flanges to
get it right...like I'm going to be doing tomorrow
night.

Joe

--- "Lewis, Gary M" <gary.m.lewis2 at boeing.com> wrote:
> Ok, no caffeine at lunch, ready to reply...
> 
> I put the thing in the way the instructions said,
> and I wrote it correctly, so we move on to plan c...
> 
> Seriously, if I take Hap's comments about
> re-orienting the BPV in the other direction, I would
> need little spring as the valve bottom is either in
> vaccuum (more or less), or at sea-level (14.7 psi),
> and the top is either under boost (up to 26 psi), or
> vaccuum.  If I have it the way it is now, in
> accordance with instructions, the valve bottom is at
> various states between vaccumm and 26 psi boost, and
> the top is the same.
> 
> What does that mean to me?  That the way I have it,
> under boost, top and bottom of valve see more or
> less the same pressure, and the spring keeps the
> valve from opening.  Off throttle, bottom sees
> boost, top sees vacuum, and the pressure
> differerntial is great enough to push open spring,
> and whoosh, air is bypassed.
> 
> If I move it around the other way, under boost,
> valve is kept closed by pressure from the top
> (manifold pressure), as the bottom is 14.7 or less. 
> Off throttle, bottom is at 14.7, top is under
> vaccuum, 14.7 psi pushes valve open, high pressure
> rushes in from the side of the valve into bottom of
> valve.  No mondo spring necessary.
> 
> Do I have "Headupbutt Syndrome"??  Or have I got it
> right?
> 
> And thanks for all the patience...
> 
> Gary Lewis
> 
> 1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust
> Manifold, RS2 Injectors, Custom Turbo (K26 Turbine,
> Factory K26 Cold side (Audi Works '999' P/N) with
> 50mm intake and custom Innovative Turbo compressor
> wheel), TurboXS Type 25 Bypass Valve, Bilsteins,
> Eibachs, Big Reds, Spec II Clutch.
> 
> 
> 
> > -----Original Message-----
> > From: Joseph Pizzimenti
> [mailto:pizzoman at yahoo.com] 
> > Sent: Monday, December 22, 2003 12:09 PM
> > To: Lewis, Gary M; CaptMagu at aol.com;
> s-car-list at audifans.com
> > Subject: RE: [s-cars] Bypass Valves and Pressure
> Losses (Uh, Pizzo??)
> > 
> > 
> > http://www.decaf.com/switch/
> > 
> > 
> > 
> > --- "Lewis, Gary M" <gary.m.lewis2 at boeing.com>
> wrote:
> > > I'm having a F'n morning...
> > > 
> > > Godda#it, now I gotta go home at lunch, look at
> the
> > > F'n directions, look at the F'n valve, and write
> > > another F'n email.
> > > 
> > > I'll report back with either a) stupidity (I
> wrote
> > > the wrong thing) or b) stupidity (I installed
> the
> > > damn thing incorrectly), or c) I put a hit out
> on
> > > you for making me drive all the way home.
> > > 
> > > Off topic, I was gonna drive home anyway, as I
> > > forgot the F'n caliper brackets in the F'n
> garage
> > > this morning, and I have some lift time
> scheduled.
> > > I also have some nice Primitivo (Eyetalian
> > > Zinfandel, a close cousin) grapes fermenting
> that
> > > should have tha cap punched down.  Nice, 28
> brix,
> > > perfect p.H., a Tuscan wet dream.  Delish.  And
> the
> > > wagon can hold ~500lbs of grapes easy.  Fastest
> > > agricultural vehicle in the world...
> > > 
> > > Bitc# bitc# bitc#...
> > > 
> > > Thanks Joe,
> > > 
> > > Gary Lewis
> > > 
> > > 1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2
> Exhaust
> > > Manifold, RS2 Injectors, Custom Turbo (K26
> Turbine,
> > > Factory K26 Cold side (Audi Works '999' P/N)
> with
> > > 50mm intake and custom Innovative Turbo
> compressor
> > > wheel), TurboXS Type 25 Bypass Valve, Bilsteins,
> > > Eibachs, Big Reds, Spec II Clutch.
> > > 
> > > > -----Original Message-----
> > > > From: Joseph Pizzimenti
> > > [mailto:pizzoman at yahoo.com]
> > > > Sent: Monday, December 22, 2003 11:50 AM
> > > > To: Lewis, Gary M; CaptMagu at aol.com;
> > > s-car-list at audifans.com
> > > > Subject: RE: [s-cars] Bypass Valves and
> Pressure
> > > Losses (Uh, Pizzo??)
> > > > 
> > > > 
> > > > Gary,
> > > > The pressure side should be feeding into the
> side
> > > of
> > > > the piston, not the bottom.  No wonder you
> breezed
> > > > through the install.  :-)
> > > > 
> > > > It's a bit at h doing it the right way, but isn't
> it
> > > > always?
> > > > 
> > > > Pizzo
> > > > 
> > > > --- "Lewis, Gary M" <gary.m.lewis2 at boeing.com>
> > > wrote:
> > > > > Hi Hap,
> > > > >  
> > > > > I oriented it from the bottom (pressure
> side),
> > > as
> > > > > the instructions indicated, with 6 shims, as
> > > Pizzo
> > > > > indicated.  It works far better than the old
> > > 710N
> > > > > unit from a pressure loss standpoint (I
> gained
> > > 200
> > > > > rpm in 4th gear).  My current automotive
> goal in
> > > > > life is to reduce pressure losses in hope of
> > > getting
> > > > > 26 psi at 3,000 rpm.  I'm making progress.
> > > > >  
> > > > > I think the idea you postulate is really a
> neat
> > > one.
> > > > >  It should provide far better response than
> a
> > > > shimmed-to-the-max BPV.
> > > > > Uses vaccuum primarily, not pressure and
> vaccum
> > > to open the
> > > > valve.  I
> > > > > will try it.
> > > > >  
> > > > > Sorry I took so long to answer, but I needed
> to
> > > > > think about this for a few days.
> > > > >  
> > > > > That Trevor is something else, ain't he? 
> The
> > > more I
> > > > > talk to him (virtually of course), the more
> I
> > > want
> > > > > to drive his car.  No to mention your of
> > > course...
> > > > >  
> > > > > Thanks Again,
> > > > > Gary Lewis
> > > > > 
> > > > > 1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2
> > > Exhaust
> > > > > Manifold, RS2 Injectors, Custom Turbo (K26
> > > Turbine,
> > > > > Factory K26 Cold side (Audi Works '999' P/N)
> > > with
> > > > > 50mm intake and custom Innovative Turbo
> > > compressor
> > > > > wheel), TurboXS Type 25 Bypass Valve,
> Bilsteins,
> > > > > Eibachs, Big Reds, Spec II Clutch.
> > > > > 
> > > > > 	-----Original Message-----
> > > > > 	From: CaptMagu at aol.com
> > > [mailto:CaptMagu at aol.com]
> > > > > 	Sent: Thursday, December 18, 2003 1:23 PM
> > > > > 	To: Lewis, Gary M; s-car-list at audifans.com
> > > > > 	Subject: Re: [s-cars] Bypass Valves and
> 
=== message truncated ===


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