[s-cars] Fw: Hoppen Stage IV - boost (or lack thereof) issue

[Robert Pastore]

Marc:

First step, pull codes -- they don't lie.  No codes?  Then check for
mechanical damage to the turbo.

Remove the hose from the maf to the turbo, and spin the turbo shaft by hand
and feel for excessive bearing play.  The shaft should turn easily, and a
only small amount of play is acceptable in the shaft bearing.

If this is ok, then remove the cover from your wastegate.  Move the top of
the valve up and down and make sure the diaphragm isn't torn.

Once you rule out a mechanical problem with these two, we are back into a
problem with Motronic control of the boost.



-----Original Message-----
From: Igor Kessel [mailto:igor at s-cars.org]
Sent: Sunday, September 15, 2002 9:04 AM
To: Marc Weiner
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Fw: Hoppen Stage IV - boost (or lack thereof)
issue


Marc Weiner wrote:
>
> This is a multi-part message in MIME format.
> --
> [ Picked text/plain from multipart/alternative ]
>
> Hey all, don't post often.  I have a 94 S4 w/ Hoppen Stage IV (est.360hp)
RS2 turbo, exhaust man., injectors, lehman re-worked cyl. head, lower
compression pistons, lehman stage IV chips (same car written up in EC w/
Frank "Don" Amoroso, Mark Hunter, etc.)  Anyway, I was doing a typical
commute to Denver from Ft. Collins and somewhere in the middle of it I lost
all boost.  Car seems to be running on just the 20V 5cyl. w/ no turbo
assistance (or maybe very little).  I have gone through all the hoses (not
getting any wooshing sound -like its blowing out somewhere BTDT many times
(have all 3 of the samco sport hoses and and the upgraded adjustable (metal)
WBV from Dave Jones.  I know what it sounds like when a hose has popped off
and that is that the case here.   I am getting absolute 0 reading on my TDO
0-30psi boost guage (needle won't budge even on full throttle) - car had
been consistently making 25-26psi at full throttle overboost.  There are no
warning lights coming on.  Car had
> been running flawlessly, however, I do have 180k on the clock.   Any
ideas????- could it be an ECU or pressure sensor problem (the ECU has a 3.0
bar pressure sensor/transducer).  Thanks in advance for any help. . . .I am
stumped.
> Marc Weiner
> Ft. Collins, CO

A snapped turbo shaft?

--
Igor Kessel
two turbo quattros
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