[s-cars] DahlBack Racing BYpass Valve, why not two.

[Trevor Frank]

I was wondering with all of these bohemouth FMIC, mine is 3.5 x 12 x 24,
and unfortunately side to side.  I suspect there is nearly a 3psi
pressure drop or so acroos it at redline, so what about placing one
bypass valve on the other side of the intercooler?  I was thinking about
maybe even two, adding complexity. Possably one the "throttle body side"
set with enough spring pressure as to only open after xx psi, nearly a
safety valve more than a bypass.  I suspect it could even vent to
atmosphere withought causing issues.  It may even be a feature, to
richen up if boost get's to high.  It may also cause lots of problems.
Any thoughts.

-----Original Message-----
From: QSHIPQ at aol.com [mailto:QSHIPQ at aol.com]
Sent: Tuesday, September 23, 2003 5:39 AM
To: airs41994 at hotmail.com; s-car-list at audifans.com
Subject: Re: [s-cars] DahlBack Racing BYpass Valve

--
[ Picked text/plain from multipart/alternative ]
If it opens under vacuum and closes under pressure it should work the
same as
the stock bosch.

An interesting shop story...  Working on a wild S car (full RS2 battle
dress
+ 6spd), chasing intermittent high end boost/rpm problems.  Mucho
diagnostic
and chip changes, hardware changes... For S&G I replaced BPV with stock
bosch,
no problems.  It came down to one of those high tech aluminum housinged
bypass
valves was deforming from turbo heat, causing the valve to stick open on
occasion when car got hot.  I suspect further, that a simple relocate of
these
valves to a cooler location would avoid a lot of heat related failures

Scott J


In a message dated 9/23/2003 7:15:18 AM Central Daylight Time,
airs41994 at hotmail.com writes:

Hi all,
I received my new bypass valve. I wanted to replace the stock one with
somethnig different. I went to the Dahlback Racing website a few weeks
ago
and found some nice goodies on there. So I ordered the new bypass valve
from
them. I got it last week and this thing is a monster! It is almost twice
the
size of the stock one! Hopefully I will install it either today or
tomorrow.
Will keep you guys posted!


AngeloAA
94 S4
83 urq


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