MAP Sensor Values

[yoda69]

I did bit of a search on map sensors and found some interesting info that maybe worth sharing.

MAP Values.gif

This came from http://www.robietherobot.com/storm/mapsensor.htm
Based on my calculations the following equations maybe of some help:
1 Bar kpa = 19*Volts + 10
2 Bar kpa = 39.8*Volts + 8.8
3 Bar kpa = 62.3*Volts + 3.6

Using this as a guide:
1 Bar at 105kpa is 5.00 Volts
2 Bar at 105kpa is 2.42 Volts (not 2.5 as might be expected)
3 Bar at 105kpa is 1.63 Volts

Not sure if the above info is right, but it may explain some of the problems people have had changing from a 1 Bar sensor to a 2 Bar sensor.

yoda69

[VL400]

Nice table and info there yoda69 The info I have from various GM code bases is pretty much the same and have used these in 12P ...

1Bar
MAP(kPa) = (0.369 x N) + 10.354

2Bar
MAP(kPa) = (0.781 x N) + 8

3Bar
MAP(kPa) = (1.22 x N) + 2.2

Where N = (Volts/5.1) * 255

[yoda69]

VL400,
Thanks for the update.
Hopefully this info is useful for some people to at least ensure sensors are working as expected.
It's also handy with old $5D logging to ensure that the conversion from Volts to MAP is correct, which is where all this started for me.

yoda69

[Holden202T]

$5D ... whats that again

[yoda69]

Logging on 160baud is so slow.
Feel like it'd be quicker with a multimeter, pen and paper.

[GM Tech]

Logging on 160baud is so slow.
Feel like it'd be quicker with a multimeter, pen and paper.

Tell me about it, I was playing with a stock VN on the weekend and thought there was someting wrong with the laptop whilst waiting for the data!

[VL400]

Logging on 160baud is so slow.
Feel like it'd be quicker with a multimeter, pen and paper.