[s-cars] Stock boost level

Mark Rivera mrivera at webcats.net
Tue Apr 17 11:26:50 EDT 2007

I may have mentioned this before, but not only am I only showing 15psi, the
boost is dropping at higher rpms to a max of about 10psi.  Now, if my gauge
is in fact off a couple pounds, is it still normal for the boost to drop off
at around 5500rpm through redline?

I'm also getting terrible mileage.  Mostly in town driving, short trips, but
I think 14.5 MPG for the last two tankfuls is a bit extreme.  I'm going to
replace the O2 sensor as a matter of course, whatever the problem misght be.
Do you all pony up and buy the dealer part, or does a 3 wire universal
sensor exist?  I've used universal replacements on 4 wire apps, but I can't
seem to find a 3 wire anywhere...


-----Original Message-----
From: Robert Rossato [mailto:bob.rossato_af at cox.net]
Sent: Monday, April 16, 2007 22:12
To: 'Mark Rivera'; 'S-Car-List'
Subject: RE: [s-cars] Stock boost level

Stock boost levels are around 17 psi, at least that's what I used to get
and what seems to be the general consensus.  But before you go spending
a lot of time chasing a small boost leak (or issue with waste gate, BPV,
or WGFV), the first order of business is to verify the instrumentation.
It's always possible that the gauge is off by a psi or two.  Swap it
with another gauge, or if you know someone that can test it.


> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Mark Rivera
> Sent: Monday, April 16, 2007 2:23 PM
> To: S-Car-List
> Subject: [s-cars] Stock boost level
> Sorry, this has probably been hashed over many times, but I
> think it was
> Calvin over the weekend who said he thought my 15psi max
> boost was low on my
> unmodified '93 S4.  From the searching I'd done in the past,
> I thought about
> 15psi was about right.  Do I need to start looking for boost leaks???
> Thanks,
> Mark
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> S-CAR-List at audifans.com
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