[s-cars] Really LOW Boost!

[Calvin & Diana Craig]

Dwayne,

I already checked that.  Besides, no matter what the computer is doing with
the lower hose from the wastegate disconnected the turbo should spool to
infinity...well at least until fuel pressure cutoff :)

That's why I did that test was to eliminate all computer related problems.

--Calvin


-----Original Message-----
From: D Cosby [mailto:dccosby at hotmail.com]
Sent: Saturday, November 16, 2002 5:25 PM
To: calvinlc at earthlink.net
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Really LOW Boost!


Hmm... a little low for just the wastegate spring, but I wouldn't be
suprised (mine spring was 5 psi according to my digital boost guage).

My first guess is that you popped off the hose that runs from the engine bay
to the ECU. Take off the black cover dead center behind the strut brace
right up against the firewall. You should see a plastic line that runs
towards where the ECU is. Make sure this thing is attached. They have a
habit of blowing off due to the cheap hose clamp Audi uses here. BTDT.

Good luck.
Dwayne


>From: "Calvin & Diana Craig" <calvinlc at earthlink.net>
>To: <s-car-list at audifans.com>
>Subject: [s-cars] Really LOW Boost!
>Date: Sat, 16 Nov 2002 16:17:08 -0700
>
>OK guys, here's the problem.  I normally get about 15-20 psi depending upon
>the usual stuff, rpm, weather, load, etc.  Today I was getting this
>"normal"
>boost one second and the next time I stepped on it I got 4-5 psi, even too
>low for just wastegate spring level of boost.  All of a sudden.  No other
>symptoms...no missing, etc.  Revs smoothly to 7k rpms.
>
>I checked the hoses, lower intercooler hose was just recently
>replaced...they look fine.  On top of that I don't hear any of the
>horrendous whoosh noises that usually accompany leaky hoses.
>
>Swapped bypass valves with my '91 200...no difference.
>
>I examined the wastegate diaphragm and it looked OK.
>
>I removed the hose to the lower chamber of the wastegate which should cause
>boost to scream up until the fuel pump cutout, but no luck, it did make it
>up to 8-9 psi, though.
>
>This is obviously not computer related since all that was knocked out of
>the
>running with the last test I did.
>
>Are damaged turbos that all of a sudden lose 15psi of capability still
>capable of producing 8-9 psi?
>
>I am really struggling with this one.
>
>Thanks for any help!
>
>--Calvin
>
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