[s-cars] Stock boost levels?

[Ned Ritchie]

Here is a write up I did several years ago.
http://www.intendedacceleration.com/tip_1.html

If you want the table that was in the quattro quarterly let me know.
Ned

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of mlp5
Sent: Wednesday, June 09, 2004 9:19 AM
To: 'Robert Myers'; 'Mark Strangways'; 'Lino M. Valadas'; 'James
Shackelford'; s-car-list at audifans.com
Subject: RE: [s-cars] Stock boost levels?

My conversion chart/table tells me 1 bar = @14.50377 psi.  
In less than round numbers, 2.2 works out to something like 31.9086 psi,
so
say 32 psi.
 
I don't know what one is supposed to use for "normal" atmospheric
pressure
or how that should be applied to determine a psig number.  I guess the
"normalized" number for average days at sea level is 14.7.  In Everboost
my
guess is that would be something more like 12, and for the lesser beings
living below Everboost (down another 2,000' of elevation or so), say12.5
to
12.7 psi.  I've been assuming that the 14.5, 14.7 and by extrapolation
12,
12.5 and 12.7psi all represent values measured from "total vacuum, or
"0".
So your 20 psig would work out to anything from 34.7 psia at "sea level"
to,
say 32.0 psia in Everboost?
 
I guess the devil must be in the details.  In the mean time I'm still
sticking with my last paragraph, the ".... 18psi dropping to 15-16...."

 
If I have a question about the numbers Bob, it would be should one
subtract
1 bar, i.e. a fixed, never variable 14.50377psi, from Lino's
(presumptively
misplaced decimal) 2.2 bar Gauge reading, or 1 "local" atmosphere, say
14.7
psi for those low life, low lander Canadians (maybe plus a 1/10th or two
for
their generally coLD weather) to determine how much boost he thinks he's
running.
 
mike

-----Original Message-----
From: Robert Myers [mailto:robert at s-cars.org] 

You are forgetting one little detail.  Bar are usually measured in
absolute
terms.  2.2 bar would be 2.2 bar above total vacuum.  In round numbers
2.2
bar is about 35 psia or about 20 psig (or 20 psi above "normal"
atmospheric
pressure).  That is about 20 psi of boost.  This is well within reach of
a
mildly chipped S-car and not that far above an unchipped s-car which
would
normally peak out at about 16 or perhaps 17 psig of boost.


At 09:15 AM 6/9/2004 -0600, mlp5 wrote:



Missing a decimal point would still put Lino's gauge in the @ 31 psi
peak
[MLP] 
 
..... snips   .... 

Until Lino clears it up, I think I'll go with the missing a decimal
point &
somehow reading/reporting absolute pressure for @ 18psi,
dropping/stabilizing at @ 14 to 16psi (i.e., 2.1-1= 1.1x14.5=15.95)
interpretation.  Which after all, FWIW would seems more normal for a
stock,
unchipped ECU.  But, OTOH if Lino is regularly running 30+psi I'd be
pretty
interested in how he's doing that too :-)

mike


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