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Old 06-29-2001, 02:31 PM   #1
STiShawn
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Default SAFC Numbers needed, yes I searched

I need the adjustment numbers for a 99 RS 5 speed with a 2 1/4 cat back, Borla Header, ISR intake and plat. plugs. Any tuning info or install info would be appreciated too.
I searched the archives and got some great stuff, Im just looking for a bit mroe.

Thanks peep's....
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Old 06-29-2001, 03:01 PM   #2
JGard
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you need an A/F gauge to do any sort of tuning. it will be different for everyone. it wouldn't be safe to tune without knowing what and in which direction tuning is needed.

you can get one of these Air/Fuel gauges for like $60 new

Last edited by JGard; 06-29-2001 at 03:08 PM.
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Old 06-29-2001, 03:39 PM   #3
STiShawn
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Where? And can I get one to tap off an existing 02 sensor?
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Old 06-29-2001, 03:48 PM   #4
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this is where I bought mine

http://www.nipponpower.com/gauges/autometer_gauge.html

and it will hook into your ECU...and will work on our cars.
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Old 06-29-2001, 04:01 PM   #5
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Why do you need an A/F ratio guage if the AFC doubles as one?

Chad
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Old 06-29-2001, 04:03 PM   #6
STiShawn
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jgard18, how does it tie into the ECU, or does it just tap a wire?
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Old 06-29-2001, 04:18 PM   #7
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It should have instructions. But from what I know of the ECU, it would just tap into one of the O2 sensor wires. (i just don't know which one, yet. I'll be doing this myself this week).

RacerinLSL: The AFC does not double as a gauge. it tells you how much it's correcting it, once you've set it, but it won't tell you how rich or lean it runs. it can't. it doesn't take any readings from the O2 sensor. Plus, when setting it, you would need another device anyway...one to read from, one to write to.

Last edited by JGard; 06-29-2001 at 04:36 PM.
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Old 06-29-2001, 04:34 PM   #8
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IIRC in the sensor feature you can read the voltage off of the 02 sensor....hence reading rich or lean....but you'd have to note where and which to be able to go back and correct it, or use the replay feature...
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Old 06-29-2001, 04:40 PM   #9
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I don't know about that... I guess I could be wrong here, but I've spent the past two days reading about the AFC.

It only reads from the throttle position sensor, the engine speed sensor, and the MAP (MAF) sensor. The ECU is what changes things, in accordance to what the intake sensor, and the O2 sensor tell it. The AFC, however, will take what the intake sensor is telling it to give in terms of amount of air, and adjust it however you tell it, by tricking the ECU that there is more or less air than there actually is, therefore giving it more or less fuel, respectively.

It does not know if the engine is running rich, lean, or stoich. it only does what you program it to do, which is adjust the fuel levels by a certain percentage at a given throttle and rpm. if you want me to get into it even more, I can break out the Apexi documentation I have
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Old 06-29-2001, 04:42 PM   #10
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Blue wire to the front 02 sensor, it will read the voltage and display it....hence a poor mans AF ratiometer....at least thats what I have read in the I-Club forum archives....I might be wrong. Im gonna get a gage anyways...
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Old 06-29-2001, 04:44 PM   #11
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S-AFC Wire Color ECU Wire Color ECU Wire #
Red : Power Green / Red B135 #7
Gray : Throttle Light Green B136 #17
Green : RPM Blue B134 #30
Brown : Ground 1 Black / Yellow B134 #35
Black : Ground 2 Black / Yellow B134 #35
White : MAP (In) Pink / Blue B136 #5
Yellow : MAP (Out) Pink / Blue B136 #5

I know it's tough to read...but check out http://www.scoobymods.com/mods/impreza/s-afc.php

there is no blue wire on the S-AFC.

Also from Apex's site, this is what it reads and displays:
Intake Manifold Vacuum/Boost Pressure
Air Flow
Intake Manifold Pressur
Karmann Frequency
Engine RPM
Throttle Position
Air Flow Correction %

Last edited by JGard; 06-29-2001 at 04:50 PM.
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Old 06-29-2001, 04:58 PM   #12
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btw...

if I came across as a dick, sorry, didn't mean it

but seriously, check out www.apexi.com and even that scoobymods page. That'll tell you just about everything (and more) you would want to know about the S-AFC.
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Old 06-29-2001, 05:28 PM   #13
STiShawn
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printed all the pages you mentioned, maybe I mis read them. I just talked to Josh at COBB, he says the slave AF gages like the autometer are innacurate.
Does anyone know where to get an independant BOSCH AF meter?
Or, has anyone had any experience with the K&N af gage?
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Old 06-29-2001, 05:35 PM   #14
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Well for the MY99 you can do the Blue wire mod that hooks the first 02 sensor into the s-afc. it will give you a general idea of rich or lean at wot shoot for .85-.87. This method will work but is a pain in the ass. Due to the fact that the vltage #'s are so erratic. you could also pick up a good EGT and probe this is a much better(and safer) method.

BTW. i did the Blue wire mod to my AFC MY99RS last year......but this weekend i'll also be installing an egt and a A/F ratio meter.....kinda redundant but what the hell right?
-Terry
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Old 06-29-2001, 05:46 PM   #15
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Jim: Terry and Shawn are correct. It's possible, but quite useless for tuning. The O2 sensor wire is blue on Fishguy's car too, so it should be the same on yours...

-WaC
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Old 06-29-2001, 06:13 PM   #16
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ok, yeah, on the car it's blue. but it looked like he was saying on the AFC it's blue.

either way, you see what I was getting at. can't really tune with it. and from what I read, you can't really display it, either on the AFC
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Old 06-29-2001, 08:15 PM   #17
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JGard18,

The O2 sensor voltage can be read from the sensor chk screen. It shows on my SAFC under In-2. I believe this can be used for tuning purposes. 0.800V is considered stoic. Around .83V+ would indicate a rich condition and .77V- would be starting to run on the lean side. While I've never been able to test its accuracy with an EGT or A/F gauge, I did a poor man's test. When I tuned it so that it ran in the 0.850V range, I could smell the car running rich under WOT. It started popping when I let off the gas and the whole 9 yards. Back to 0.800V and all was well. I know my car runs very lean around 5500 RPM if no SAFC is used. I tested this also - indicated 0.650V at 5500 RPM if I set my hi-throt to all 0s. I'm not saying that it's as good as an EGT, but I've found it to be very consistent.
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