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

[Joseph Pizzimenti]

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 Pressure
> Losses (Uh, Pizzo??)
> 	
> 	
> 	Gary
> 	
> 	I have the H34 TurboXS right now. Do you have it
> plumbed from the side? In other words is the
> pressure feed from the turbo plumbed into the side
> of the piston. If not you'll want to reorient it
> this way and then you won't need any washers. In
> fact I went to a softer/shorter spring. I had
> shimmed my old H34 like crazy, well beyond the
> provided washers and was still having a problem
> getting it to hold boost. I talked directly to the
> TurboXS folks a while back when there was a thread
> running on mounting BPVs backwards. They admitted
> that for high hp applications that this was the way
> to go and sent me a brand new H34 configured for a
> hard mount at the side. Tha's what I have now but
> even with the softer/shorter spring I'm still
> getting that boost surge at throttle lift from
> boosted runs. It was Trevor Frank's idea to try a
> softer spring and it has greatly improved the
> problem but has not totally fixed it. My next try is
> a beefier diaphram unit. The stock Mitsu EVO BPV
> couldn't hold my turbo's force.
> 	
> 	Hap, boostin and surgin in Everboost, Maguire 
> 
> _______________________________________________
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