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

[Joseph Pizzimenti]

Boys,
Simmer down.
Injectors were on the intake manifold last I checked
on the AAN and this whole boost gauge tapping issue
can be solved by using an overpriced, but real pretty
electrical Omori or Defi gauge, which has a remote
sender that sits in the engine bay and all you get in
the passenger compartment is a few wires.

FWIW, there's more harmful stuff in the ambient air in
Jersey (which smells) than you'll ever get from a
mechanical boost line into your cabin.  Also, if it
ever leaked (on a mechanical gauge), you'd see ZERO
boost and I hope you would notice that first.

Pizzo, not Joel
'94 RS2'd S4 for sale

--- Mark Strangways <strangconst at rogers.com> wrote:
> 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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