Below is the chart for my 2.5 Bar MAP sensor. It's a Bosch 0261230042 used in the Redline Saturn cars. I installed a TVS supercharger on my Trail Blazer SS a few years ago, and never got my tune right- and I suspect part of the reason is because I've never had the MAP sensor setup correctly.
The way the chart reads to me is the range is 20-250 kPa. So, does that mean I set it up in the software as:
MAP Sensor Linear: 250 kPa
MAP Sensor Offset: 20 kPa
MAP Sensor Linear B: 83.3kPa
Actual spec file is here: http://almisoft.ru/files/bosch_map.pdf
In the spec file, it shows a chart of P1 and P2, and both points are slightly above and slightly below the actual sensor's endpoints. In other words, the graph shows that sensor will detect pressure below P1 (20kPa) slightly, and above P2 (250kPa) slightly. So do I need to account for that?
It says output voltage at P1 is .4 volts, and at P2 is 4.65V. If VCM Editor is looking for kPa at 5V for the first parameter, and kPa at 0V for offset, how would one figure that out? I could get my vaccum pump out and put a vacuum on the sensor ad test it I suppose, but what a pain that is if I have the data file for the sensor.
Any help would be appreciated.