OBD2 app vs aftermarket gauges

SouthArk370Z · 08-01-2018, 12:10 PM

Quote:

Originally Posted by Jayhovah

I don't think I've heard of anyone getting an accurate boost reading for our cars.. On mine I think it stops at 1psi or something, but I also do not have an upgraded MAP sensor so it would be impossible to get the reading in my case. I have asked others that are tuned via speed density and have proper MAP sensors but haven't heard of anyone getting an accurate boost reading from OBDII.

From my experience as an Instrument Tech, that sounds like the sensor is the wrong range (looks like your sensor maxes out at 1 psi) and/or the ECM hasn't been re-scaled (not sure that it can be re-scaled).

Jayhovah · 08-01-2018, 01:49 PM

Quote:

Originally Posted by SouthArk370Z

From my experience as an Instrument Tech, that sounds like the sensor is the wrong range (looks like your sensor maxes out at 1 psi) and/or the ECM hasn't been re-scaled (not sure that it can be re-scaled).

the OEM sensor only reads vacuum IIRC... though you might be right about the rescaling for those who have gone speed density and have upgraded their MAPs to read positive pressure.

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