Calibrating prosport premium boost gauge for high altitude
05-26-12, 09:33 PM
#1
Calibrating prosport premium boost gauge for high altitude
Posting this here because I couldn't find another thread with this information and I thought it might be helpful to others.
I just figured out how to calibrate my prosport premium boost gauge for high altitude (~5420ft). When I first hooked it up, with the car off, the gauge read ~6 in/Hg of vacuum. To make it read zero, I took a 2mm Allen wrench and stuck it into the little adjuster in the back of the gauge to the right of the electrical connections with the gauge powered on. About a 1/4 turn counter clockwise, and the gauge was reading zero.
The quality control sticker read 3/2012 on mine, so I can only guarantee this works on gauges of the same design.
I just figured out how to calibrate my prosport premium boost gauge for high altitude (~5420ft). When I first hooked it up, with the car off, the gauge read ~6 in/Hg of vacuum. To make it read zero, I took a 2mm Allen wrench and stuck it into the little adjuster in the back of the gauge to the right of the electrical connections with the gauge powered on. About a 1/4 turn counter clockwise, and the gauge was reading zero.
The quality control sticker read 3/2012 on mine, so I can only guarantee this works on gauges of the same design.
05-26-12, 10:02 PM
#2
is it accurate now though?
most gauges don't have an altitude adjustment and are set to read 0 at sea level. adjusting it to read 0 at your altitude may cause it to read a little more accurately in vacuum but more boost than actual.
you can test it with a pressure/vacuum gauge teed into a line with a vacuum pump and small air compressor.
most gauges don't have an altitude adjustment and are set to read 0 at sea level. adjusting it to read 0 at your altitude may cause it to read a little more accurately in vacuum but more boost than actual.
you can test it with a pressure/vacuum gauge teed into a line with a vacuum pump and small air compressor.
05-27-12, 08:19 PM
#3
You make an interesting point.
If I were to guess the most common way to implement a boost gauge, the pressure sensor would act as a simple varistor, and a potentiometer would be used to identify/calibrate for zero. I haven't disassembled the Prosport gauge, so I cannot confirm if that is their basic design.
For vacuum I used a Mityvac. At 5, 10, and 15 in/Hg, the gauge read true. At 20, the gauge read 21. I was unable to produce any more vacuum, most likely the connections were starting to leak.
The regulator on my compressor is designed for higher pressures, the lowest 3 markings are 15, 20 and 40 psi. The gauge read true at 15 and at 20.
I'm sticking with the stock turbo, so 10-15psi is probably the most I'll ever safely achieve. I'm satisfied with the accuracy but I would be interested in the results of a "laboratory" setup and/or what Prosports officially would have to say.
If I were to guess the most common way to implement a boost gauge, the pressure sensor would act as a simple varistor, and a potentiometer would be used to identify/calibrate for zero. I haven't disassembled the Prosport gauge, so I cannot confirm if that is their basic design.
For vacuum I used a Mityvac. At 5, 10, and 15 in/Hg, the gauge read true. At 20, the gauge read 21. I was unable to produce any more vacuum, most likely the connections were starting to leak.
The regulator on my compressor is designed for higher pressures, the lowest 3 markings are 15, 20 and 40 psi. The gauge read true at 15 and at 20.
I'm sticking with the stock turbo, so 10-15psi is probably the most I'll ever safely achieve. I'm satisfied with the accuracy but I would be interested in the results of a "laboratory" setup and/or what Prosports officially would have to say.
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