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Old 09-29-2002, 06:48 PM   #1
Scooby Newbie
Member#: 24306
Join Date: Sep 2002
Default High elevation=low vaccum?

What is you vaccum on a stock, or close to stock (turboxs) wrx 2.0L turbo in or around Denver Colorado? I would think it would be the same everywhere, but Just wanting to see if what i have is normal...Im around -0.05Mpa +or- .01Mpa on the stock gauge, a little less on warm up..
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Old 09-29-2002, 07:32 PM   #2
Scooby Specialist
Member#: 5994
Join Date: Apr 2001
Location: Fort Collins, CO
2004 Impreza WRX STi
Java Black


I can't think of the conversion right now but depending on the day here in the Springs (~6000ft above sea level) I see about 12-14inches of vacuum and/or 32-38kPa as per my MAP sensor in the intake manifold at warm idle.
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Old 09-29-2002, 08:35 PM   #3
Scooby Newbie
Member#: 24306
Join Date: Sep 2002

Thanks....thats about what i get in inches also..i live in fort collins right now so its pretty close...i think the conversion is about -.05Mpa
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Old 09-30-2002, 01:54 AM   #4
Scooby Specialist
Member#: 12340
Join Date: Nov 2001
Chapter/Region: MWSOC
Location: Lincoln, NE
2002 WRX 2.5L Hybrid


It's amazing what a few thousand feet of elevation will do to a car. I vaccum at 18in here at idle. Of course when I'm up there I get the same readings as you guys. The difference in how long it take for your turbo to spool at higher elev. is pretty depressing also. Anyways... Talk to ya later!
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Old 09-30-2002, 11:11 AM   #5
out back
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
01 BH


I was driving over a local pass this weekend, at perhaps 6000 feet, on probably a 6-7 grade, and i was in 5th all the way up. Boost was extremely high for such a grade, what could only be due to the higher elevation.

Back down in the valley, at ~4300, on a similar grade, the car barely gets into positive boost.

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Old 09-30-2002, 08:50 PM   #6
Ski Man
Scooby Newbie
Member#: 5334
Join Date: Mar 2001
Location: Arvada, Colorado
2002 WRX
WR Blue


Boost and vacuum on your guage are relative to local atmosphere no matter if you're at sea level or 12,000 feet. The fact that you have more elevated boost at elevation has to do with engine load and degrading engine and turbo performance at low pressure.

Two different issues. Also remember that out ECU does do some adjustments for altitude, including lowering the boost cut to try and keep in the turbos effeciency range.
Hope that helps.
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