[s-cars] Hose leak and boost gauge 'tap' location

[Mock, Bruce J (Bruce)]

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Hey all

need to tap into the collective knowledge database...

hopefully this is an easy one..

I've been noticing lackluster acceleration coupled with a loud Whooooshing =
sound under heavy boost coming from the right front area of the engine bay =
on my '93 S4 lately...  Upon further investigation - sure enough - I found =
a hole about the size of my little finger in the turbo to crossover pipe ho=
se.

Even with this gaping hole, my boost gauge behaves absolutely normally: - i=
t reads ~13 in. vacuum at idle and reads ~ 19 -20psi boost under max accel.=
  (This is with an MTM 270 chip)  So what gives here?  The main reason I in=
stalled a boost gauge was so that I would know if (when) I ever had a leak =
in the system.

My boost gauge is 'T-ed' in on the line that runs down to the ECU - right n=
ear the moisture trap along the firewall  - this is the line that is notori=
ous for popping off all the time on our cars.

Here is the question:  Am I measuring the vac/boost in the wrong place?  It=
 would seem that this is so.  After all, why is the gauge telling me there =
is ~19psi boost when this is obviously NOT the case?  DUH - Must be BC I am=
 not measuring the boost in the correct place.

Where are you guys tapping in to measure vac/boost?  It seems that we would=
 want to measure vac/boost that is present IN the intake Manifold.

Am I missing something here?

Thanks

Bruce