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Old 10-30-2000, 08:22 AM   #1
RidinLow
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1995 325i
Arctic Gray

Post MY00 AFC tuning notes

Finally had a chance to wind out the RS at high rpms in 4th on a long drive yesterday, & here's what I noticed:

EGT's are around 1250 at WOT from around 1500-3500 rpm --> running rich... corrected by about -4%.

From 3500-redline, the EGTs move up to 1500 --> running lean... corrected by about +4% for now, haven't had a chance to fine tune that value yet, but I know it runs lean, especially since my Autometer EGT probe is kinda slow.

MY00 RS, intake, 2.25" catback, pulley

I'm also running a +4% at low throttle at 1500 rpm to get rid of the pinging. For some reason, b/t 3500-4000 rpm, the car pings at about 15% throttle (& the EGT's start to rise if held there), but not with more or less throttle. *shrug*
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Old 10-30-2000, 05:04 PM   #2
nizz
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2004 Forester XT
24k gold on white

Question

Garrick,

This is with what octane gasoline?

nizz
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Old 10-30-2000, 05:50 PM   #3
RidinLow
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93
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Old 10-30-2000, 08:41 PM   #4
IMPBOY
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This proves that I wasn't crazy when I said my 00 runs lean.
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Old 10-30-2000, 09:31 PM   #5
Hashiriya
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Midnight Black Pearl

Question

Sorry to butt in but I just got a AFC for my MY00 and got it wired in. But when I started to work on it I could figure out all the info about my car. Can you tell me what kind of sensor the MY00 has and all the other things the AFC asks for.
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Old 10-31-2000, 10:21 AM   #6
the spacecowboy
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Post

yes....please post as much as possible.....

im getting a afc and i would like to know as much as i can before i start messing with it...

also where can i get a wiring diagram

thanks,
space
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Old 10-31-2000, 11:40 AM   #7
Hashiriya
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Lightbulb

I got my diagram at geocities and searched for "Impreza super AFC" I cant remember details but someone had a nice diagram.
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Old 10-31-2000, 02:08 PM   #8
Eric SS
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Post

the MY00 has a pressure sensor. MY98-99 has a MAF sensor.

Eric
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Old 10-31-2000, 04:45 PM   #9
Hashiriya
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Question

So what do I put for the part after the no. of cylinders with the arrows?
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Old 10-31-2000, 05:25 PM   #10
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no. of cylinders = 4
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Old 10-31-2000, 05:27 PM   #11
Hashiriya
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Question

duh , what's the arrow marks and the ** for?
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Old 10-31-2000, 05:47 PM   #12
Keirik
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hey ridinlow,
So what value are you shooting for here with the o2 sensor .87? I still never got my AFC tuned................by the way, if I use 89 octane, should this change anything? My car runs better under 89 than 93.
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Old 10-31-2000, 05:55 PM   #13
RidinLow
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I dunno, I've never looked at the O2 sensor voltages since they're not gonna be anywhere as accurate as my EGT gauge.
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Old 11-01-2000, 07:14 AM   #14
Hashiriya
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Question

Someone help me out here, what's the sensor no. for the MY00? I know it's a pressure sensor but what do I input for the in/out no. on the AFC?
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Old 11-01-2000, 02:18 PM   #15
bluesaint
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the EGT autometer i would believe to be just as accurate as looking @ ur AFC since both are getting the information from the same place. On my MY00 with pulley,intake,exhaust I run RICH starting @ 3000rpm
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Old 11-01-2000, 02:25 PM   #16
RidinLow
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Post

Hashiriya, sorry if I keep ignoring you, but I don't remember what car settings I have in my AFC, but I'll check the next time I go out.

Bluesaint, the EGT probe and the O2 sensor are not getting their data from the same place. The EGT probe is reading exhaust gas temperatures right after the exhaust valves. The O2 sensor is detecting the amount of O2 in the combusted mixture. In a MY00, the AFC can only monitor the rear O2 sensor. This results in a lean reading because the cat has cleaned things up a bit. The front O2 sensor can't be read because it's wideband.

So unless somebody comes up with a way to read the front O2 sensor, EGT's are the only reliable way to tune the MY00, IMO.
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Old 11-01-2000, 02:50 PM   #17
wac
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Post

You know, there's always a way to convert a "wideband" signal to a "narrowband" signal (from an RF point of view, those terms are sadly misused). Just rig up a simple inline op-amp circuit that scales down the input voltage. Then you can feed it to the second S-AFC input.

Even if the scaling isn't exactly linear, you can always calibrate the stoichiometric points to match. Then you can mentally correct for the rich and lean amounts as necessary. In fact, it wouldn't be much more of a stretch to create a display like the A/F bargraph on the J&S Dual Monitor.

-WaC
Wayne
97 OBS
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Old 11-01-2000, 07:37 PM   #18
ImprezaRS dot com
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Post

The Blitz FATT turbo timer (Fully Auto Turbo Timer) has a neat accessory you can buy for it, the A/F analyzer, and it comes with it's own O2 sensor! This displays on the turbo timer's digital display.

This is next in line to buy, along with fuel pressure gauge and Brake rotor/pad combo...

Larry www.ImprezaRS.com
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Old 11-01-2000, 07:45 PM   #19
RidinLow
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Post

But having 3 O2 sensors in the system just seems ridiculous, IMO...
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