[s-cars] Bypass valves - Which one?

[Trevor Frank]

So I just got an email from someone and I realize I forgot to mention
the most significant difference.

A diaphragm style valve has a larger surface area on the vacume side,
and smaller on the plunger side.  This also effects the speed of opening
and force that is generated, plus with such a diferential you should
need less spring, you also have much more force holding the valve closed
this again would require less spring relative to a plunger style.

Of course this is all on the chalk board.

-----Original Message-----
From: Trevor Frank 
Sent: Tuesday, December 02, 2003 12:20 PM
To: Joseph Pizzimenti; Lewis, Gary M; s-car-list at audifans.com
Subject: RE: [s-cars] Bypass valves - Which one?


So I really like the diaphragm style, 2 reasons.
1) it takes a bit of engineering and capitol to manufacture a good
diaphragm style bypass valve.  Otherwise I could make it.
2) Low inertial mass, quicker response, the bosch is really the epitome
of this all others are degree's worse.  Big aluminum, plastic slugs are
pretty serious offenders, the worse being brass.

-----Original Message-----
From: Joseph Pizzimenti [mailto:pizzoman at yahoo.com]

Sent: Tuesday, December 02, 2003 12:02 PM
To: Lewis, Gary M; s-car-list at audifans.com
Subject: Re: [s-cars] Bypass valves - Which one?

Bailey stinks, especially for that cfm you're flowing,
Gary.  The internals are still rubber/plastic.  The
TXS 34mm is too big for our plumbing, unless you have
the 2Bennett Samco?  I used the TXS H-25 on my RS2
turbo, clean as a whistle.

Joe

--- "Lewis, Gary M" <gary.m.lewis2 at BOEING.COM> wrote:
> I'm running:
> 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, life begins at
> 3,400 rpm)= RS2 Comp++, and 26 psi VMAP-D software.

> Call it 375hpish.
>

> I've looked at Hyperboost, Forge, Bailey, and the
> TurboXS H34.  The Bailey looks the best, but
> opinions?
>

> Thanks,
> 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), Bilsteins, Eibachs, Big Reds, Spec II
> Clutch.
>

> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list


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