LS3/LS7 MAP Sensor Foruma Voltage to KPA

[02pewterz28]

Hi guys so I've searched and searched and havent found anything. Basically what I'm trying to do is wire in another MAP sensor to my dash logic so I can monitor crank case vacuum output by my vacuum pump. To do this I plan on using a ls3/ls7 map sensor I had laying around.


Here is the question, I need to make a pid to convert the 12591290 map sensor voltage into a KPA reading I can work with. Does anyone know what that pid is from GM?

I found a 1 bar conversion for GEN III sensors which is (V/.0533+10.35) but as far as I can tall it doesnt work with the ls3 style sensor. Can someone help me out here? I suppose I could go get an ls1 style sensor and make it work but I'd rather try to make this happen.

[schpenxel]

The data you need to figure it out is in the tune...

Stock 2007 C6 LS7 file has values of linear = 94.43, offset = 10.34

linear is the map change per 5 volts. So 94.43 / 5 = 18.886 kpa per volt

offset means at 0 volts the value is 10.34 kpa

From there you should be able to figure it out

MAP kpa = output voltage * 18.886 + 10.34

[02pewterz28]

The data you need to figure it out is in the tune...

Stock 2007 C6 LS7 file has values of linear = 94.43, offset = 10.34

linear is the map change per 5 volts. So 94.43 / 5 = 18.886 kpa per volt

offset means at 0 volts the value is 10.34 kpa

From there you should be able to figure it out

MAP kpa = output voltage * 18.886 + 10.34

Thanks bud I appreciate it! For some reason my latest 3.4 scanner doesnt have map voltage as a pid to log, guess I'll have to contact supprot about that one

[02pewterz28]

If i ever did get an ls1 sensor I assume I could look up the same values in the ls1 pcm and use those

[schpenxel]

Yeah I dunno, I've never had a reason to log raw map voltage

Yeah you should be able to do the same thing for whatever sensor