Anyone have any documentation on when the pressure sources solenoid operates?
27 January 2004, 01:23 PM
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As title.
Under what circumstances does the ECU read atmospheric pressure?
If it is only at start up then what happens when you drive up the side of a mountain?
I need to know, the reason is boring, but I need to know
Under what circumstances does the ECU read atmospheric pressure?
If it is only at start up then what happens when you drive up the side of a mountain?
I need to know, the reason is boring, but I need to know
27 January 2004, 02:47 PM
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I beleive it works on occasion when you release the throttle.
Of course this is no good for using the same pressure sensor for a MAF-MAP conversion!
I think you may need an independant sensor, or use some electronic trickery to send a fixed atmos value to the MAP line when requested by the pressure exchange solenoid is fired
Paul
Of course this is no good for using the same pressure sensor for a MAF-MAP conversion!
I think you may need an independant sensor, or use some electronic trickery to send a fixed atmos value to the MAP line when requested by the pressure exchange solenoid is fired
Paul
27 January 2004, 03:11 PM
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Maybe it will just overfuel and pop a bit more than usual when it does this then 
Can't be worse than a VTA? I'll find out.
Looking at combined TMAP (temperature and MAP sensors) but all I could find went up to 1 bar absolute.
Can't be worse than a VTA? I'll find out.Looking at combined TMAP (temperature and MAP sensors) but all I could find went up to 1 bar absolute.
27 January 2004, 05:17 PM
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think Stephen Done said something on this a while ago.
and, think Paul is right - in that it checks when throttle is closed. At what frequency - who knows !
but obviously it does use it for relative calculations in the ECU. Seem to remember Steve saying that it would affect boost as the ECU limits / setpoints are all relative to atmo. (which obviously make sense!)
but if you're not using ECU for boost control , im not sure what else it would effect !?!
Steve
and, think Paul is right - in that it checks when throttle is closed. At what frequency - who knows !
but obviously it does use it for relative calculations in the ECU. Seem to remember Steve saying that it would affect boost as the ECU limits / setpoints are all relative to atmo. (which obviously make sense!)
but if you're not using ECU for boost control , im not sure what else it would effect !?!
Steve
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