Why is my MAP sensor values going up when I open the throttle body?

[The Fatty]

I expected it to go down? Actually I expected it to start in minus values and get closer to 0 when the tb is open? Also can the sensor only read 0 - 13.9 psi?

 

[bashracing]

when the throttle is shut you have a vacuum, as the throttle valve open you get atmospheric pressure the 13.9psi, well actually atmospheric pressure is 14.7 psi so you have vacuum of 0.8 psi through restriction in the intake

 

[The Fatty]

when the throttle is shut you have a vacuum, as the throttle valve open you get atmospheric pressure the 13.9psi, well actually atmospheric pressure is 14.7 psi so you have vacuum of 0.8 psi through restriction in the intake

for some reason I thought this would be corrected! thanks, this makes sense now :smile:

any idea on the range of the stock MAP sensor?

 

[Dan@SJM]

Atmospheric. ~1100mBar. Without the engine running have a look at the map sensor and barometric sensor and they should be the same

 

[bashracing]

any idea on the range of the stock MAP sensor?

are you thinking of going boost?

 

[The Fatty]

Atmospheric. ~1100mBar. Without the engine running have a look at the map sensor and barometric sensor and they should be the same

Couldnt get a reading off the barometric sensor so thought it didnt have one, must be the wrong pid! I will try again!

 

[The Fatty]

are you thinking of going boost?

no I am just interested in the range. I might have another non-car related use for a spare sensor I have later on down the line

 

[The Fatty]

Couldnt get a reading off the barometric sensor so thought it didnt have one, must be the wrong pid! I will try again!

Does anyone happen to know the parameter id for the baro sensor?