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Old 03-21-2005, 02:20 PM   #1
WRXout
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Member#: 52908
Join Date: Jan 2004
Location: Houston, on highway 6
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2005 WRX STI FTI 20G
ASPEN WHITE

Default utec, perams question

i have a question my friend clark made me a map and he told me to put a mode on gauge mode, i know where it is but i forgot what its called, ne ways i have it on absolete, whats the diffrence?
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Old 03-21-2005, 03:09 PM   #2
hippy
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Absolute pressure is gauge pressure+atmospheric pressure. When you're at sea level, gauge and absolute pressure will be the same since 0+gauge pressure=absolute pressure. As you go up and the atmospheric pressure reduces, that difference is translated into the absolute pressure. Ie-If the atmospheric pressure is -5psi, then a gauge pressure of 15psi would be an absolute pressure of 10psi(since 15+-5=10). In other terms, absolute pressure is the pressure relative to sea level, and gauge pressure is the pressure relative to atmospheric/ambient pressure.

Since gauge pressure is the pressure relative to ambient pressure, running 15psi at altitude would push the turbo about as hard as 15psi at sea level. If ya push 15psi of absolute pressure at altitude though(when the pressure in the atmosphere starts at -5 in this example), the gauge pressure would be 20psi, and it would be like pushing 20psi at sea level not 15psi since ya started at -5 not 0. There are other variables(like air density and what not), but this is just the basics.

The difference in the utec utec setting is just the display of the boost in a log. By default, the log will report absolute pressure. Clark told ya to set it so it reads gauge pressure in the log so that if you set the boost at altitude, you won't set it too high. Ie-If ya set the boost at 18psi the way the boost is reading in the log by default(absolute), and you set it while at altitude(starting at negative absolute pressure instead of 0), you could end up pushin the turbo like you're running much more. Long explination, but I think that's right.

peace

Last edited by hippy; 03-22-2005 at 11:34 AM.
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Old 03-21-2005, 08:03 PM   #3
WRXout
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thank you my good sir very help ful
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