[s-cars] Stock boost levels?

[Calvin & Diana Craig]

James,

This all depends on altitude.  The controller on our cars is largely based
on maintaining a constant absolute manifold pressure; it has a little bit of
adjustment for target pressure above about 4k feet in altitude but not a
ton.   As the ambient pressure goes down (i.e. altitude goes up) the boost
goes up to maintain a relatively constant manifold pressure.  When driving
at 6k feet here in the South Denver Metro area, I normally see between 20
and 21 psig with a stock chip at altitude.  When I go down to sea level,
i.e. long distance trips to the midwest, I usually max out at about 18-19
psi.  So the answer to your question depends on where you are at.

--Calvin




-----Original Message-----
From: s-car-list-bounces+calvinlc=earthlink.net at audifans.com
[mailto:s-car-list-bounces+calvinlc=earthlink.net at audifans.com]On Behalf
Of James Shackelford
Sent: Tuesday, June 08, 2004 9:32 PM
To: s-car-list at audifans.com
Subject: [s-cars] Stock boost levels?


I just got around to installing a boost gauge and was wondering about stock
boost levels.  I have only had the car 4 months, the previous owner bought
it from a friend in Vail who was an enthusiast and had two UrS4s.  I have no
idea of what was done to it.  It has Eibach/Bilstien suspension.  The
Michelin man hose was replaced with a Samco.  If I recall, stock boost
should max out to about 16~17?  Is that right?



On the freeway, 5th gear WOT, it boost to 22 and then settles around 20-21,
with no surging, same in 4th.  Could it be chipped?  I will pull the ECU and
take a look at the chips next week.  Wastegate was cranked in, but I
loosened it all the way flush because of surging.  Boost is very smooth now.



Thanks for the input.



James





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