2 bar senor for 3sgte, caldina Options

[timdog1720]

Okay new question on the 2bar sensor. for my st215 Caldina engine which other turbo pressure sensor (2 bar sensor) can I use with this 4th gen 3sgte since its real hard to find one. also If you know of one do you know if it been proven to be the same

[pitcelica]

gen3 has a 3bar MAP sensor.
gen4 has a 3bar MAP sensor, but it is physically slightly different than the gen3 one because it's bolted on the intake manifold instead of the firewall.

You asked for another MAP sensor that you could use to replace your ST215 one. I've said you could use the ST205 one (gen3) because it has the same scale, so the ECU will read the pressure correctly. What is the problem here?

You need to understand what a MAP sensor really measure. It measure the Absolute Pressure inside the Manifold. It can measure from 0PSI absolute (-14.7 PSI vaccum or -1bar in relative pressure speaking) to 43.5 PSI absolute (29 PSI boost or 2 bar in relative pressure speaking). So, this is a 3bar sensor. I agree with you that it can measure only 2bar in relative pressure, but this is not the full scale of the sensor.

[timdog1720]

gen3 has a 3bar MAP sensor.
gen4 has a 3bar MAP sensor, but it is physically slightly different than the gen3 one because it's bolted on the intake manifold instead of the firewall.

You asked for another MAP sensor that you could use to replace your ST215 one. I've said you could use the ST205 one (gen3) because it has the same scale, so the ECU will read the pressure correctly. What is the problem here?

You need to understand what a MAP sensor really measure. It measure the Absolute Pressure inside the Manifold. It can measure from 0PSI absolute (-14.7 PSI vaccum or -1bar in relative pressure speaking) to 43.5 PSI absolute (29 PSI boost or 2 bar in relative pressure speaking). So, this is a 3bar sensor. I agree with you that it can measure only 2bar in relative pressure, but this is not the full scale of the sensor.

Okay! with no disrespect toward the fact that your helping me. However trust the fact that i'm very much aware of relative pressures, it fits into what I do as an Engineer. For what it seems that; of what your not understanding of me is, my research has led me to believe that the Gen 4 (ST-215) engine has a 2 Bar sensor as opposed to a 3 Bar sensor. So now:

Sensor Relatively speaking Full scale spectrum

2 Bar 14.7 psi 29.4 psia = A meaning of no more than 14lbs of boost
3 Bar 29.4 psi 44.1 psia = A meaning of no more than 29lbs of boost


What your saying is I need a 3 bar sensor. I fully Understand that point. However as I have aforementioned, I've been told the sensor is 2 Bar (figuring 29.4 psia) on the ST-215 engine. Is that information wrong? The information also states this is absolute when referring to the scale.

As always Thanks...