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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,225
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Stick with the Porsche values, but it doesn't really matter. The important test of residual pressure is how long it maintains RP. I say that should be at least 30 minutes, but longer is better.
How long does your system hold RP?
When you shut off the ignition, and thus the fuel pump, pressure is trapped in the system and held under pressure by the fuel accumulator (FA). Usually this starts around 1.5 bar, then slowly bleeds down. If the pressure bleeds off too quickly, you will have trouble with warm re-starts, in fact, difficult warm restarts are most often due to a bad FA (the internal diaphragm leaks). Other points that hold the RP are the SP valve on the fuel distributor, the FD, the WUR, and the check valve at the pump.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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