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

[Mark Strangways]

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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