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FPR maintains constant pressure relative to intake manifold, so it's always 2.5, or 3.0 bar above manifold pressure. When you go into boost mode, your manifold pressure might be as high as 1 bar (14.7 psi), then the actual fuel pressure (as seen by the fuel pump) will be 1+3 = 4 bar (for a 3 bar fpr). As to the question about effect on idle, going from a 2.5 to 3.0 bar FPR will be about a 9% increase in fueling (square root of ratio of two pressures). The LH system (ECU) should be able to handle this, and will adjust injector pulse down based on the oxygen sensor output. With LH2.2 you might have to adjust the AMM as well...
posted by 196.3.4...
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