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Old 05-29-2000, 10:38 AM   #1
Swivel1000
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Member#: 1168
Join Date: Mar 2000
Location: Houston, TX
Vehicle:
2004 Jeep Grand
Cherokee Limited 4x4

Question MY 2000 Super AFC thoughts...

I am in the process of figuring out which route i want to go.

I know i want to stay N/A probably for good, but i may have second thoughts in 2-3 years...

I am interested in some moderate hp gains..i know i will be doing intake, full exhaust, pulleys, etc...

i am debating on putting in the apexi Super AFC. i have read past posts but nothing has really truly answered some things.

I know it is not necessary even with intake and exhaust will it make a noticable difference? Or does anyone with an AFC and 00 impreza have any thoughts...

Also whats an estimated install time, or difficulty?

Any thoughts on doing an ITC in conjunction or as opposed to an AFC?

And finally, besides having a dyno is there any other way to find the best values to use?

Thanks a lot, i love this board

matt
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Old 05-29-2000, 01:25 PM   #2
AWDriver
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I've been debating for a couple of months now whether or not to get a SAFC for my 2000 RS w/intake and exhaust. I know it runs rich (cats stink at WOT, lots of little (and a few not-so-little) pops and crackles when shifting/decelerating, poor mileage and a measured 11.8:1 A/F ratio at redline). However, the car performs well with a nice smooth power curve, and I'm not sure how much improvement I'll see with the SAFC.

I've asked for this information a couple of times before and gotten no definitive response. Several people said something along the lines of "if you know your car is running rich, then a SAFC will help you extract a bit more power". OK, that's a given. What I'd like to see (before I spend a few hundred bucks) is something like "my average 0-60 time has gone down by 0.2 seconds" or "my 1/4 mile trap speed went up by 3 mph". Anyone have numbers?

Sensitive-butt-dyno results are welcome too!
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Old 05-29-2000, 01:50 PM   #3
RidinLow
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How did you measure your A/F ratio? A/F gauge hooked to the 2nd O2 sensor? New O2 sensor in front of the cats?

~G
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Old 05-29-2000, 02:25 PM   #4
AWDriver
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I had my intake and exhaust installed at Minnam Racing, and they used their A/F meter with a sensor stuck up the tail pipe, and then drove around for a few minutes (I wasn't in the car, and they were driving hard - I could hear my car 4 or 5 blocks away!) When they got back, they told me that my car was running very rich at redline (11.8:1). They seemed pretty happy with the results (mine was the first 2000 model they tested), as they were about to install a turbo kit on a 2000 RS whose owner was concerned about running lean at redline.
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Old 05-29-2000, 03:42 PM   #5
Swivel1000
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Cherokee Limited 4x4

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So they felt it was very rich...does that mean you are going to invest in an AFC?

matt
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Old 05-29-2000, 04:56 PM   #6
AWDriver
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Will I get an AFC? Well, I'm a little concerned about premature catalytic converter failure. Otherwise, if I gain 1 or 2 HP, then no. If I can gain 5-10 HP and a bit of fuel economy, then yes.

Problem is, I don't know what my gains will be! Anyone have any estimates on how much power I'm losing at redline running at 11.8:1 A/F ratio?
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Old 05-29-2000, 06:31 PM   #7
Bob O
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Chapter/Region: MAIC
Location: Felton, PA, USA
Vehicle:
2000 2.5RS & SV1kS
BRP

Question

How is the running rich situation under normal conditions (ie not at redline or WOT)? I already have an exhaust on order (Rallispec 2.5 N1 catback) and I really want to get an induction intake. However all the rumors I have heard are that it will run really rich with the intake tube. So rich that your gas mileage will suck and you will have sooty exhaust. From someone with a MY00 and an intake (Minnam I assume) how "BAD" is the rich run problem? I would hate to drop the cash for the intake only to find the situation unbearable and be forced to pull the intake off or get the SuperAFC and put it in (BTW I assume the install will void the factory warranty for certain parts).

Thanks
Bob O
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Old 05-29-2000, 11:12 PM   #8
ImprezaRS dot com
over boosted again
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Post

Interestingly, the "stinky cats" smell on my MY00 with custom intake and Stromung exhaust got significantly better ever since my 2.25" midpipe was fabricated and installed at Midas Muffler last week.

I have no soot on my tailpipes in almost 500 miles, driving at 6,000 feet. I don't figure the loss of factory warrantee is worth the APEX right now.

I was especially happy with how the car performed at 10,000 feet above sea-level on a trip to Cripple Creek Colorado today. The car did better breathing than I did.

Larry www.ImprezaRS.com

PS: I still get 27+ mpg on the highway at 80+ mph, it is the city mileage that sucks, (17-21mpg).

[This message has been edited by ImprezaRS dot com (edited May 29, 2000).]
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Old 05-30-2000, 01:44 AM   #9
IMPBOY
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I posted this a while ago. I'm probably one of the first guys to install AFC on the 2000 RS. I even posted my 1/4 time. The AFC cut down .6 sec off. I did not use dyno nor A/F to tune it. I just went by the O2 reading from the rear O2 sensor to tune it. For my car, which has home made intake, was running very lean 1k to 3k, right on the money 3k to 4k, and a bit lean from 4k to the red line before I tuned it.
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Old 05-30-2000, 09:11 AM   #10
AWDriver
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IMPBOY, 0.6 seconds in the 1/4 mile is a really nice gain! But your car was running lean? That sounds unusual for a MY2000 - perhaps the 2nd O2 sensor provides a false lower reading than the primary sensor. Don't know, just speculating, and that really wouldn't jive with your improved 1/4 mile time if you richened up an already rich mixture.

Hmmm, more MY2000 AFC mysteries. But that 0.6 seconds is very tempting...
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Old 05-30-2000, 02:25 PM   #11
IMPBOY
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That's what I was thinking about running lean. When I ran the 1/4, I leaned it out a little more. Now, I run 15.2 with no intake or exhaust. I just modified the stock intake box a little. After the runs though, I checked the spark plugs and they were all white meaning that I was running lean. I don't think all 2000 RS's run rich. In stock form, maybe it is but with modifications, all cars are different. Some may run rich, some lean...

[This message has been edited by IMPBOY (edited May 30, 2000).]
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Old 05-30-2000, 05:39 PM   #12
pilotdoc
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Question

IMPBOY, what are your current settings for your AFC? How exactly did you tune the car using the rear O2 sensor? Did you shoot for a certain voltage at WOT? TIA for all of us wondering.
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Old 05-30-2000, 08:36 PM   #13
Swivel1000
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Cherokee Limited 4x4

Post

I have a question...

i cant find my SCC so i will just ask. Shiv used an a/f led display..i forget who makes it or anything...

But could we hook up the afc to that and use that to tweak the settings and find the best mix?

thanks
matt
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Old 05-30-2000, 09:33 PM   #14
IMPBOY
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I still change my setting often to see what's better. I went for .85-.87 range to tune the AFC. I don't have my car with me at this moment but I think the last setting was something like...

1k 9
2k 6
3k 4
4k 1
5k 3
6k 3
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Old 05-30-2000, 10:50 PM   #15
Rubasu
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MY00 2.5RS
Aspen White

Post

Well I have a question. I have already ordered a JC-Sports intake (if I ever get the damn thing it will be a miracle) and was also wondering if I will need the AFC? How will I know whether I need or not?
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Old 05-30-2000, 11:25 PM   #16
bluesaint
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impboy let me get this right.. ur on positive correction % doing high rpms? 4k and up? i thought most ppl with my00 and afc put theirs to like negative vaules
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Old 05-31-2000, 01:45 AM   #17
IMPBOY
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I think AFC is important no matter what mods u have. I was actually running lean both low and high RPM.
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