boost ref. fuel pressure regulator
02-04-2009, 12:07 PM
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Short version. Vacuum line connects the diaphram of the regulator to the vacuum system of the car.
Car creates vacuum (idle, cruise), the vacuum pulls a diaphram in the regulator which decreases fuel pressure. Car makes boost, the pressure pushes the diaphram the other way and thus increases fuel pressure. The "boost reference" is that for each 1lb of boost, the diaphram should adjust to add 1PSI of fuel pressure. Baseline pressure is set via a metering screw on the regulator.
Basis for the above is that added fuel pressure makes injectors flow more than their initial rating and helps them deliver fuel into the cylinder against the boost pressure. (Thus preventing fuel starvation).
Anyhow, that's the generic answer.
Car creates vacuum (idle, cruise), the vacuum pulls a diaphram in the regulator which decreases fuel pressure. Car makes boost, the pressure pushes the diaphram the other way and thus increases fuel pressure. The "boost reference" is that for each 1lb of boost, the diaphram should adjust to add 1PSI of fuel pressure. Baseline pressure is set via a metering screw on the regulator.
Basis for the above is that added fuel pressure makes injectors flow more than their initial rating and helps them deliver fuel into the cylinder against the boost pressure. (Thus preventing fuel starvation).
Anyhow, that's the generic answer.
