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Raceboy Raceboy is offline
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Join Date: Jun 2009
Location: Estonia, Europe
Posts: 1,197
Fuel pressure will be lower at idle (depending how strong vacuum the engine makes) and at full throttle it will be at the FPR rated value when n/a (since full throttle with n/a means ambient pressure). Also can vary few kPa since engines are different (some have intake restriction -> vacuum at full throttle), also at what altitude the car is.

With very agressive cams (and thus noisy and very low vacuum signal) it is better to remove vacuum reference altogether in n/a applications as that stabilises fuel pressure and makes for easier idle tuning.
'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet
Old 04-23-2020, 11:22 AM
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