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Old 10-08-2002, 05:23 PM   #1
wackie
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Member#: 14580
Join Date: Jan 2002
Location: Sacramento, CA
Vehicle:
2004 Forester XT
www.wrxhackers.com

Question Injector size question for my application (PE1820)

I noticed most people are running the STi injectors. I was curious if the PE1820 with the proper supporting mods would be able to surpass the output of the 550cc/min injectors. I was thinking of getting RC Engineering low impedance injectors (since I'm running the UTEC) and I wasn't sure if I should get the 550's or 650's. The 650's sure are a big jump in price, but if it's going to be much safer I'd like to go that route.

Oh yeah, I plan on attending some open track days at local road tracks. Possibly a few trips to the drag strip, but that's not really my thing.

Thanks
JD
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Last edited by wackie; 10-08-2002 at 05:55 PM.
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Old 10-08-2002, 06:09 PM   #2
Austin
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Even with the small VF29, my 550's were at 85% duty at 17psi at 5400 rpm at 43.5 psi static fuel pressure.

You can definitely max out a set of 550's with the 1820.

Another alternative to getting 650's is to upgrade to parallel fuel rails and an adjustable fuel pressure regulator.

If an injector is labeled a 550cc injector, that is at 43.5psi static pressure. If you up the pressure one more bar to 58psi, those 550cc injectors become 635cc injectors.

I wouldn't go any higher than 60psi static fuel pressure though.
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Old 10-08-2002, 06:41 PM   #3
wackie
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1 bar of extra pressure seems like quite a bit. Is that something the standard 255lph Walbro pump can handle?
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