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So basically that is a FMU. That unit may give you more trouble than you want. It will boost the fuel pressure everytime you get into boost and cause a lean condition in between shifts. It won't just richen up the top end. Are you sure you aren't running out of air metering voltage?
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"Absolut Rara."
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gotapex, what you want is a fuel pressure regulator that maintains ~40psi, but relative to manifold pressure, not atmospheric pressure. You don't want a rising rate FMU that increases fuel pressure more than boost pressure increases.
Most stock fuel pressure regulators of late should have some sort of port on them to reference to the manifold; do you have any photos of your existing FPR?
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Hmm, I got to get a picture of that. It's still at my mechanic's place.
Thanks for the suggestions.
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Originally posted by Rara:
gotapex, what you want is a fuel pressure regulator that maintains ~40psi, but relative to manifold pressure, not atmospheric pressure. You don't want a rising rate FMU that increases fuel pressure more than boost pressure increases.
Most stock fuel pressure regulators of late should have some sort of port on them to reference to the manifold; do you have any photos of your existing FPR?
That's what I was thinking. The Contour has some kind of sensor that shows the difference between fuel pressure and manifold pressure/vacuum. We tried to see if we could get that sensor to do something for us during the EARLY development stages of the SF/ADC turbo kit. Of course, it all depends on how the computer interprets the sensor's output.
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The returnless engines have a fuel pressure transducer (for the PCM) at the base of the fuel rail.
The PCM has 2 tables with load vs rpm with the variable as fuel pump voltage.
This is how the system regulates overall fuel volume. It has it's good and bad points.
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Well, it's back in the shop getting that stuff looked at. Another dyno run in a few days. 
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The returnless PCM will alter the fuel pressure map to suit it's needs. Changing it is pointless.
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Is this the transducer? 
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No, looks like a standard pressure regulator on a return style system. It also looks like that is a MAP sensor in the picture. Does the Noble use a MAF or a MAP or both?
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Originally posted by warmonger:
No, looks like a standard pressure regulator on a return style system. It also looks like that is a MAP sensor in the picture. Does the Noble use a MAF or a MAP or both?
I believe somewhere above it is mentioned that it is a MAP based system.
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