Loss of power Part 2

[Fred Munro]

You can't really tell what's going on by listening for turbo spool. Splice a
line into the vacuum/boost line to the ECU and run it to a pressure gauge
fastened to the drivers side windshield wiper so you can see the gauge
through the windshield.
Warm the car up, drive it at 60 kph (38 mph) in 4th and floor it. Read the
boost at 3000 rpm. At altitudes under 5500 feet, depending on outside
temperature, you should see a boost pressure of 1.8 - 2 bar (11.8 - 14.7
psig) at 3000 rpm.
If the boost is substantially less, you have a problem with the turbo system
somewhere.

Fred Munro
'94 S4

----- Original Message -----
From: <BBBurban at aol.com>
To: <jimk at spotgraphicsinc.com>; <munrof at sympatico.ca>;
<quattro at audifans.com>; <s-car-list at yahoogroups.com>
Sent: Friday, February 22, 2002 12:37 PM
Subject: Loss of power Part 2


> Well all,
>
>         Thanks for the info on the line to the ECU but that wasn't it.  We
> checked it at all ends and they are still connected securely.  I should
have
> mentioned this is a un modified car except for suspension and wheels.
While
> testing the car again today in a valley we did hear some turbo spool with
the
> windows down and the sound   bouncing back at us off the steep banks at
the
> sides of the road.  So what I have deduced so far is the turbo is
spinning,
> the by pass valve is new, and the line to the ECU is connected.  The
engine
> still runs smoothly, just seems to have lost that UMMMPH that it had.
Does
> anyone have a suggestion where I should look next?  I am at a total loss.
>
> Thanks all
>
> Matt ( via Hank's email)