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Old 09-24-2002, 05:18 AM   #1
Reset
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Join Date: Oct 2001
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Location: Vancouver,BC Canada
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2002 2.5 TS
Aspen white

Default S-AFC or FPR ?

please advice

If I going to get between those?
any why?

my car cat back and intake done only
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Old 09-24-2002, 08:33 PM   #2
Ludelover
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neither. don't waste your money on a stock car. Car is already set up to run slightly rich so more feul won't help. Unless you are willing to shell out $150 an hour for dyno tuning neither will help.
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Old 09-29-2002, 05:12 AM   #3
Reset
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but my car is not stock
mod:
custom midpipe with no resonator blitz nurspec
injen cold air intake
zero sport crank pully
cusco adj rear swaybar
Eibach pro kit spring
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Old 09-29-2002, 05:26 AM   #4
Avenger
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Quote:
Originally posted by Reset
but my car is not stock
mod:
custom midpipe with no resonator blitz nurspec
injen cold air intake
zero sport crank pully
cusco adj rear swaybar
Eibach pro kit spring
You won't need it unless you have something major done with the engine like turbo or bigger injectors.
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Old 09-29-2002, 08:03 AM   #5
Patrick Olsen
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If you're going to choose between the two, an S-AFC is definitely what your combo needs, as it allows you to tune at selected points in the RPM band. An adjustable FPR just changes the fuel pressure everywhere, which isn't very helpful or tune-able.

My DOHC 2.5L ran really rich from about 4k on up - AFR in the 10.0:1 range. Using an S-AFC to lean out the top end to 13.0:1 I picked up 7.5hp at the peak, while keeping the lower end untouched since it was already running 13.0:1. Before I picked up my S-AFC I saw a 2000/01 RS with an intake and exhaust pick up 5+hp by leaning it out with an S-AFC. Good stuff.

To really optimize the S-AFC you'll either need access to a dyno, a decent AFR gauge, or an EGT gauge. I did my tuning on a dyno.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 09-29-2002, 02:34 PM   #6
Ludelover
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Quote:
Originally posted by Reset
cusco adj rear swaybar
Eibach pro kit spring
yup, those swaybars and springs really need a FPR.
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Old 09-29-2002, 09:26 PM   #7
obyone
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Quote:
Originally posted by Ludelover


yup, those swaybars and springs really need a FPR.
What they need are some Carbon fiber stickers, or some LED washer nossles.
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Old 09-30-2002, 01:18 AM   #8
Ludelover
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I was thinking more along the lines of muffler bearings and blinker fluid
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Old 09-30-2002, 02:36 AM   #9
Reset
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Ludelover, so you were saying CAI and Catback exhaust did not need S-AFC or FPR right?
what type of mod need to have S-AFC or FPR?
and if I want to do the next mod what is on the menu?
thanks
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Old 09-30-2002, 02:53 AM   #10
Ludelover
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It's all personall opinion, which some truthfullness. If i had the money and was going to purchase something and had exactly what you had i wouldn't bother getting an s-afc or frp. Sure the afc looks pretty tits but that $200 - $300 could be better spent on something better. If it was me i'de look into getting a custom test pipe made for the TRACK only or a 50 state legal free flow cat.

save up for a turbo kit
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Old 09-30-2002, 01:34 PM   #11
RaceCarRiot
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Quote:
Originally posted by obyone


What they need are some Carbon fiber stickers, or some LED washer nossles.
i was going to say something about window tint , but i'll be helpful instead...

with your setup, the SAFC or FPR isn't going to do much, if anything. plus, the 2000+ ECU's supposedly learn around the SAFC eventually. SAFC's are pretty much a stop gap solution...if you've got the $$ for a wicked N/A setup that would require messing with the fuel maps, a) the SAFC won't control what you need it to anyway, and b) if you're dropping that kind of cash, than you can probably afford a proper engine management system anyways.
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Old 09-30-2002, 06:33 PM   #12
2.5GT
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Quote:
the 2000+ ECU's supposedly learn around the SAFC eventually.
Now this idea really confuses me. I've heard the same things on this board BUT, if the ecu automatically goes into open loop mode upon WOT acceleration (At WOT the ecu only uses the MAP/MAF sensor for airflow input, ignoring the o2 sensor, correct?), how is the ecu going to recognize whether the fuel mixtures have changed?

Someone please explain the idea of the ecu learning around the SAFC?
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