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Old 2006-06-16, 05:57 PM   #34
WRXRallyBlue
EJ22
 
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Real Name: Rob
Join Date: Mar 2004
Location: Reno
Posts: 174
 
Car: 2002 WRX Wagon
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Thank you, Ed. I asked a member from another forum to look at it and here was his response:

Quote:
not a bad pull

i see you're at altitude by virtue of your 12psi atmos. pressure.

your mafv is decent for the lowish boost you're running.

thing is as you probably know you can't net the same gauge boost pressure
(mrp) as we can down here at sea level... when you see 12psi mrp that's like
seeing ~15psi at sea level in terms of how hard you're pushing the turbo.
so in the midrange 35-4000 you're running an equivalent to 19-20psi. you're
not going to get much more out of that turbo in the midrange, not without
adding a helper spring (and thereby fubar-ing your boost control map).

up to redline you're holding an equivalent 12.5psi, which isn't bad. it
looks like the ots map starts tapering boost (the wgcd drops) as yo
uapproach, which is good for turbo longevity, and is fairly standard
practise.

as far as timing, your KC seems high. of course, not having access to the
background tables I can't tell you how close to max they are, but they all
seem good, which means no knock. otoh, they aren't very aggressive
either... that's ONE thing you guys at altitude can get away with--more
advance. that's because the rarer air corresponds to a less-dense charge in
the chamber, and that means a slower flame front. the ecu to my knowledge
does not skew advance wrt ambient pressure, so you get the same ots map
everyone else gets. advance ramps up quickly towards redline but that is
also where wgdc cuts back an dyour boost is dropping quickly, so that's
expected and safe (total VE is dropping and again, charge density in chamber
is low, flame propigation is slow, you need to light it off sooner). I
would say as a first estimate you could bump timing 4 degrees in the
midrange which would give you an assload of torque.. maybe 30 ftlbs. know
anyone with street tuner?

as another benefit to being up high, you've got plenty of injector left
over... no need to worry about running out of fuel.
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