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Old 08-15-2003, 06:38 PM   #1
Scooby Specialist
Member#: 9237
Join Date: Aug 2001
Location: Youngstown, Ohio
2008 Saab Turbo X
400+ lbft

Default UTEC MAP off?

Im having a little trouble with my UTEC, when in the dashboard and the logger its showing 16.7psi in 4th, full throttle..

but my built in boost gauge reads much less, like .105 mpa which if im not mistaken is like 15.0psi

just wondering if i should trust the reading of my stock boost gauge, or the utec... im sure I should trust the mechanical boost gauge, but i want a second opinion =P
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Old 08-15-2003, 07:15 PM   #2
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


Read the appendices in the manual. It tells you how to calibrate the UTEC to your boost gauge.

The real question is:
Which is right?
Which is more right?
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Old 08-18-2003, 05:32 PM   #3
Scooby Newbie
Member#: 29962
Join Date: Nov 2002
Location: Tucson

I seen a lot of posts of people saying that their boost gauge reads anywhere from 1-3 psi different than their utec.
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Old 08-19-2003, 01:35 AM   #4
Scooby Specialist
Member#: 40501
Join Date: Jul 2003
Location: Paris, FR
2005 Decathalon 21sp
One WheelSeanPower


That's exactly what I'm seeing. What's right? Gauge or UTEC?
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Old 08-19-2003, 01:54 PM   #5
Scooby Newbie
Member#: 12986
Join Date: Dec 2001
Location: Planet Utah
2002 WRX


If you are at higher altitudes these values should be different as the UTEC reads MAP sensor pressure which is in absolute and the gauge reads relative pressure which changes based on your altitude.

If you are at sealevel and they are off by more than a little I would go to a third party source to see which is more accurate. If I had to choose between the two I would usually trust the MAP sensor as hose kinks, etc will really affect a boost gauge.
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Old 08-19-2003, 07:15 PM   #6
Scooby Newbie
Member#: 5094
Join Date: Mar 2001
Location: Gaithersburg, MD, usa
11.96, 1.64, 115mph!


I would trust the UTEC before you trust your gauge. I would say that 8-10 cars that show up for dyno tuning have inaccurate boost gauges. The UTEC which uses the factory MAP sensor has been very close to our dyno readings. Your logger also reads in abosulte pressure and not gauge.

If you decide that I'm wrong and want to trust your boost gauge, just remember that the UTEC could care less what your gauge says and will run the load site as it relates to what it sees.

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