Common misconception about the NA pressure sensor cleared up!
01-20-04, 01:56 PM
#1
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Common misconception about the NA pressure sensor cleared up!
Well... some people seem to think that the NA pressure sensor and ECU is capable of adjusting timing and fuel up to 3-4 psi of boost..
That's impossible.
Just to clear this up.... I stuck a voltmeter onto my MAP sensor and went for a short drive.
At idle, (about 11 in of vac) it reads about 2.5v or so...
AT full throttle (0 vac) it reads 5v
What's the referance votage for the sensor? 5v!
SO, big surprise, I brought it up to about 6 psi of boost..
5v.
Big surprise.
This is an N350 NA S5 pressure sensor.
The turbo pressure sensor is obviously calibrated 0 vacuum to return a voltage somewhere in the middleground of the sensor's range.
Anyone (Oh HAILERS....) with a TII wanna check for me?
Just thought I'd clear that up.
That's impossible.
Just to clear this up.... I stuck a voltmeter onto my MAP sensor and went for a short drive.
At idle, (about 11 in of vac) it reads about 2.5v or so...
AT full throttle (0 vac) it reads 5v
What's the referance votage for the sensor? 5v!
SO, big surprise, I brought it up to about 6 psi of boost..
5v.
Big surprise.
This is an N350 NA S5 pressure sensor.
The turbo pressure sensor is obviously calibrated 0 vacuum to return a voltage somewhere in the middleground of the sensor's range.
Anyone (Oh HAILERS....) with a TII wanna check for me?
Just thought I'd clear that up.
01-20-04, 03:12 PM
#2
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the na pressure sensor is 1 bar (-15 - 0psi*)
the t2 is a 2 bar (-15 to 15psi)
the fd is like 2 and a little bit (-15 to 17psi)
*we see like 1-2psi or positive pressure on our na, i'm not sure if we have the right sensor in it though
the t2 is a 2 bar (-15 to 15psi)
the fd is like 2 and a little bit (-15 to 17psi)
*we see like 1-2psi or positive pressure on our na, i'm not sure if we have the right sensor in it though
01-20-04, 04:15 PM
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Originally posted by Bambam7
Well... some people seem to think that the NA pressure sensor and ECU is capable of adjusting timing and fuel up to 3-4 psi of boost.
Well... some people seem to think that the NA pressure sensor and ECU is capable of adjusting timing and fuel up to 3-4 psi of boost.
The turbo pressure sensor is obviously calibrated 0 vacuum to return a voltage somewhere in the middleground of the sensor's range.
01-20-04, 06:53 PM
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I made the claim that mine went to 5v at about 3-4psi.
Maybe my sensor is just farked.. who knows..
But it was definatly not 5v at 0psi. It was more like 4
I might go test this very sensor again... Just have to find another guage since I don't have mine anymore.
Maybe my sensor is just farked.. who knows..
But it was definatly not 5v at 0psi. It was more like 4
I might go test this very sensor again... Just have to find another guage since I don't have mine anymore.
01-21-04, 12:21 AM
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It depends slightly on atmospeheric pressure (what elevation you are at) but not very much... definalt not enough to make a 3-4 psi difference!
BTW- a side note- Using my S-AFC as a voltmeter it read 4 volts, but with a voltmeter it read 5... strange....
BTW- a side note- Using my S-AFC as a voltmeter it read 4 volts, but with a voltmeter it read 5... strange....
01-21-04, 12:49 AM
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I'm at sea level, exactly. Your right elevation anyway would not be responsilbe for my (wrong) readings I took...
I took the readings with a DMM, and a relativly acurate boost guage...
I'm thinking my sensor must be rooted, are the S4/S5 sensors the same part exactly?
I took the readings with a DMM, and a relativly acurate boost guage...
I'm thinking my sensor must be rooted, are the S4/S5 sensors the same part exactly?
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