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Old 04-25-2003, 06:36 PM   #1
Scooby Specialist
Member#: 4667
Join Date: Mar 2001
Location: Asheville, NC
2002 WRX
Black (well kinda)

Default What is stock fuel pressure?

I did a search but couldn't find any real numbers.
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Old 04-25-2003, 06:39 PM   #2
Scooby Guru
Member#: 7922
Join Date: Jun 2001
Chapter/Region: MWSOC
Location: Tucson
04 CTS-V b/b/b
99 GMC Highrider


It's a rising rate fuel regulator. It 40ish psi + map pressure.
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Old 04-25-2003, 07:44 PM   #3
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: [email protected] @ 5800 ft on 13T
2002 Impreza WRX

Default Base fuel pressure

The fuel pressure regulator on the WRX is designed to hold 43.0 psi base fuel pressure with as posted above a 1:1 manifold referenced pressure rise on boost.

If you have metric gauges, 294 kPa or 3.00 kgf/cm^2

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Old 04-26-2003, 05:52 AM   #4
john banks
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Member#: 11669
Join Date: Oct 2001
Location: UK
Evo IX 345 WHP


At idle they often run higher than specced but closed loop correction/learning helps this. At least on the classics a Walbro pump often overpowers the tiny regulator and you can have 10 PSI more pressure than expected at idle.

Most injectors are specced at 43 PSI fuel pressure. If you increase the differential fuel pressure by a factor of say 1.2 to about 52 PSI, then the square root of 1.2 gives you the extra fuel volume - about 10% extra fuel for a given IDC.
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