PSI (TC) vs PSI (MAP)

KensBlueGenX

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2020 1.5T MT HB

I consistently see (on TunerView Lite) indicated pressure at the turbo being less than at the intake manifold. How can this be? If it was the other way around, I could understand it being due to some loss, a leak, or similar. But lower at the turbo? Confused I am. Thoughts?

Honda Civic 10th gen PSI (TC) vs PSI (MAP) 20230221_105909
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Ap1 George

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I consistently see (on TunerView Lite) indicated pressure at the turbo being less than at the intake manifold. How can this be? If it was the other way around, I could understand it being due to some loss, a leak, or similar. But lower at the turbo? Confused I am. Thoughts?

20230221_105909.jpg
I believe the TC pressure reading doesn't take atmospheric pressure to account which is around 14.7 PSI
 

kytos

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MAP value is absolute reading, sensor in the manifold and TC is relative reading, sensor in the chargepipe
 

KTuner

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Both sensors are shown in absolute. I don't understand the post with the included photo, as clearly the MAP is lower than TC value in the photo and I'm assuming you chose that photo as the example for a reason.
 

kytos

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Both sensors are shown in absolute.
Sensor are absolute. Readings of MAP and TC are relative. What I meant is TC doesn't read the same vacuum.
 


KTuner

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Sensor are absolute. Readings of MAP and TC are relative. What I meant is TC doesn't read the same vacuum.
No, the readings are absolute. The photo clearly shows that as confirmation.
 
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KensBlueGenX

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Both sensors are shown in absolute. I don't understand the post with the included photo, as clearly the MAP is lower than TC value in the photo and I'm assuming you chose that photo as the example for a reason.
DaNG! If the readings are negative (I.e. not on boost at the moment) then of course -10.91 is less than -1.23. What was I thinking!?! My bad.

I retract this entire thread!
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