[s-cars] Help with a "moisture trap" definition re: boost gauge installation

[Trevor Frank]

Vacuum.

-----Original Message-----
From: Mark Strangways [mailto:strangconst at rogers.com]
Sent: Monday, July 07, 2003 1:25 PM
To: Dave Forgie; s-car-list at audifans.com
Subject: Re: [s-cars] Help with a "moisture trap" definition re: boost
gauge installation


I did mine just about right at the ECU.

But, why would there be fuel in the intake manifold really ?? The fuel
is injected at each cylinder.

But I assume that would be a thread for another day !

Mark S
----- Original Message -----
From: "Dave Forgie" <forgied at burnaby.associated-eng.com>
To: <s-car-list at audifans.com>
Sent: Monday, July 07, 2003 4:00 PM
Subject: [s-cars] Help with a "moisture trap" definition re: boost gauge
installation


Gentlemen:  I have been having an internet "conversation" with an
"internationally reknowed" (in his opinion) "20vt tuner" (You can guess
who).  The point of the discussion is my understanding about the
"moisture trap" (which is isn't) and my contention that you should be
able to T a boost gauge anywhere downstream of the "trap".  What is
wrong with my statement below?  Comments and corrections appreciated.

Dave F. suggested:

"The 'moisture trap' (which is the wrong name for it) is an analogue to
analogue pressure  transducer, i.e. there is a air/fuel mixture pressure
"signal" from the intake manifold side of a  fuel resistant diaphram
which is translated to an air-only pressure "signal" in the plastic tube
leading to the ECU. The pressure transducer (2.5 BAR or 3 BAR) inside
the ECU box is analogue (pressure) to electrical and translates the
analogue pressure signal (can be read  on an analogue gauge) to a
millivolt electrical signal (that can be read with a multimeter - as you
well know) that is read by the chips in the ECU. (The one thing I don't
know is whether  the ECU pressure transducer also creates a digital
output from the millivolt pressure translation or there is something
else that does this before the chips).

In any event, to install an analogue pressure gauge, it should be fine
to T' off anywhere  downstream of the analogue pressure transducer and
before the ECU box. The advantage of  T-ing near the ECU is the analogue
pressure signal tube has already gone through the  firewall and into the
passenger cabin. "

 Dave F.

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