I'm using the same efi source 3bar map and had a similar problem with seeing multiple values listed. My next one will probably buy will be a factory GM 3 bar sensor that was for the LSA/LS9 (Part# 12592525).Boostedforlife wrote: If it's a linear problem I don't think I can fix that. It's the cheap efi source plug and play 3bar. But they don't give a datasheet to look at. But it's cheap so can't expect much. They say it's a 0-305 koa sensor with a 1.11 offset also seen 315 with 3.xx but to get my baro pressure right I have 310.xx and a 9.Xx offset.
The lowest I've seen on the motor is .25 volts and the highest is 2.02v. with my inaccurate figure it's 132 kpa which just give me an idea but it's a start right. I see the problem now with using volts it's just so many variables in sensors but it will give you an idea of where you are. Not prefect but better then nothing.
Multiple sources show that to be:
MAP_Sensor_Scale_Factor = 312.5
MAP_Sensor_Offset = -11.25
On top of the fact that it's an OEM supplied sensor, so it should be reliable and consistent from sensor to sensor.