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Old 04-21-2001, 03:18 PM   #1
blue
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Member#: 2089
Join Date: Aug 2000
Location: chicago il united states
Vehicle:
2001 Impreza 2.5RS
Blue Ridge Pearl

Question Q: A'PEXi S-AFC

I have just bought a A'PEXi S-AFC. I went to the site and look at the USA update for sensor and ECU type the site says a 96-98 have a sensor HW-4. And the ECU is a S1. But i have a 2001 rs. When i took the ECU out it says M-3 on it. Does anybody know how to hook it up and how to tune the air flow right? How did you guys wo have a 2000 impreza hook the wires up. I need to know so i can install it. Thanks

[This message has been edited by blue (edited April 21, 2001).]
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Old 04-21-2001, 05:59 PM   #2
Safir
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. Paradise is
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Post

check forcefed4.com in the turbo RS faq they have a s-afc wiring diagram
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Old 04-21-2001, 06:21 PM   #3
blue
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Blue Ridge Pearl

Question

mine is not a turbo is it the same?
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Old 04-21-2001, 06:29 PM   #4
Safir
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yes, to the best of my knowledge you use the same hook-up points.
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Old 04-21-2001, 06:34 PM   #5
blue
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Location: chicago il united states
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2001 Impreza 2.5RS
Blue Ridge Pearl

Question

Thanks do you have one also? And if i install it but don't know how to tune it yet can i set the numbers to zero? Will it harm or affect anything? What is the name of the sensor?

[This message has been edited by blue (edited April 21, 2001).]
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Old 04-21-2001, 06:54 PM   #6
GTBGUY
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Location: Calgary, Alberta, Canada
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'99 BGP Legacy GT
'98 QS Legacy L (auto)

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If I remember correctly, on MAP cars on w/ stock fuel injectors, stock fuel pressure riser and stock fuel pump, the SAFC is quite useless. Not sure if you really want to take the hassle of installing it.
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Old 04-21-2001, 07:30 PM   #7
NA Impreza
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Location: Vancouver, B.C., Canada
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1999 rs
white

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i'm also planning to get the S-AFC, so i want to know if it does improve performance? i have an air filter and exhaust....i remember reading on SCC that it does help and reduces the lose of power at low RPM range? is this true?
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Old 04-21-2001, 07:32 PM   #8
GTBGUY
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Location: Calgary, Alberta, Canada
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'99 BGP Legacy GT
'98 QS Legacy L (auto)

Post

NA Impreza- It will help on MAF cars (which is what your RS uses for air flow measurements). Also, the SAFC helps if you have larger injectors etc.

It's only for the MAP cars that it doesn't do much.
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Old 04-21-2001, 07:47 PM   #9
Safir
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the S-AFC is NOT useless on the MAP cars (my00+) true the ecu will learn and correct for any adjustments made a the "low throttle" setting, if you set your high throttle to about 80% you can adjust the a/f ratio. so while the S-AFC is not as useful in the MAP cars as in MAP cars, it is still useful.
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Old 04-22-2001, 08:34 PM   #10
tmat3
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Location: NYC and Troy, NY
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2001 Impreza 2.5RS
BRP

Post

Here is my installation guide to SAFC on MY01 RS
http://www.geocities.com/matsut_rpi00/safc.html

You need an A/F meter or preferably EGT to tune the SAFC. Without the gauges, don't do it.
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Old 04-22-2001, 09:37 PM   #11
Remy E. LeBeau
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I may be dumb , but what does one of those things actually do?? Is it a true upgrade and do you need to have a turbo to have on or can you run one on a NA Powertrain?? I hear they are like 400 bucks, but how much performance do you get??? I want to know!!
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