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Old 08-01-2002, 03:29 PM   #1
mwebb1508
Scooby Newbie
 
Member#: 13042
Join Date: Dec 2001
Location: denver dolorado
Vehicle:
2000 impreza 25.rs
blue

Default fuel pressure (not just another newby question)

alright guys i need some help i have a 2000 rs with cai headers pulley, exhaust, chip, safc and itc. i am going to do the series to paellel fuel mod and i want to do and fpr with it my question is will it do anything for me and if so what pressure would u suggest. I was told the stock pressure was 45 and i am also going to do lightened flywheel and a clutch so i believe i am at the static limit of my injectors. which fpr should i get? also i heard that an fpr makes the car idle badly becuse it runs way too ricgh but i thnk that would be easily corrected with my afc. anything you guys can offer will be greatly appreciated thanks
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Old 08-01-2002, 04:25 PM   #2
jeffg
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Member#: 2958
Join Date: Nov 2000
Chapter/Region: NWIC
Vehicle:
2001 WRX (GC8)

Default

Why do you think you are the static limit on your stock injectors. The 2000-2001 RS runs extremely rich, even more so with CAI and exhaust.

I have basically the som mods you do, but with different electronics. I have had a lot of good results with pulling fuel away from the stock injectors. I get better gas milage and more power.

do you have any sort of AF or EGT guages? What are you using to tune your SAFC and ITC?

With the mods you have, I dont think an aftermarket fpr would help you any. I think the stock one is enough. If you want one that would act like normal (idle, pressure) you could look at getting an fpr off of an SVX. My car idles at 37-38psi and is about 43-45 at WOT.

J
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Old 08-02-2002, 04:35 AM   #3
mwebb1508
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Member#: 13042
Join Date: Dec 2001
Location: denver dolorado
Vehicle:
2000 impreza 25.rs
blue

Default how im tuned

i have the itc running with no knock at +5 on the last three dials as for the afc i am backing off the fuel about 11 it is tuned with my a/f guage and my butt dyno.
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Old 08-02-2002, 04:39 AM   #4
mwebb1508
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Member#: 13042
Join Date: Dec 2001
Location: denver dolorado
Vehicle:
2000 impreza 25.rs
blue

Default ps

also i thought the horsepower for the injectors was 173 to go static and im definately over 173. its a 60 dollar mod so if it doesnt cost too much and if it does a little as i am going to do cams and heads in about 2 months its well worth it
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Old 08-02-2002, 01:22 PM   #5
jeffg
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Vehicle:
2001 WRX (GC8)

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More fuel pressure will make you injectors go static sooner. You are already taking away fuel.

Increasing fuel pressure, just to take it back out with the SAFC is a waste of $60.

Really I dont see a point, even with heads and cams. If you had a turbo kit, yeah maybe you would need an adjustable FPR.

J
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Old 08-02-2002, 01:34 PM   #6
Reciprocity
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Join Date: Mar 2000
Chapter/Region: BAIC
Location: Alameda, CA
Vehicle:
2012 dcrawford died
for your sins

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I HIGHLY suggest getting that car on a dyno with an A/F sniffer in the tailpipe before messing around with the fuel system any further.

What sort of A/F guage are you using in the car? Which O2 sensor is it reading from?

Personally I think it's pretty crazy to start hypothesizing about the fuel delivery on the car without getting some real good data first.

You sound like you are pretty serious about developing more power...and if that's the case you really should get more information about what your car is really doing, and then decide what it needs.

Just my advice.

NC
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