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

Default What is stock fuel pressure?

I did a search but couldn't find any real numbers.
Thanks
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Old 04-25-2003, 06:39 PM   #2
mbiker97
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Join Date: Jun 2001
Chapter/Region: MWSOC
Location: Tucson
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04 CTS-V b/b/b
99 GMC Highrider

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It's a rising rate fuel regulator. It 40ish psi + map pressure.
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Old 04-25-2003, 07:44 PM   #3
hotrod
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Member#: 14141
Join Date: Jan 2002
Location: 13.239@102.85 @ 5800 ft on 13T
Vehicle:
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


Larry
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Old 04-26-2003, 05:52 AM   #4
john banks
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Location: UK
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Evo IX 345 WHP

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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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