1.....is it a pressure or a hot wire sensor...i set it to pressure and for afl% got nothing but in hot wire...the afl% gave me numbers.....also what in and out numbers do i put......

2.....the throttle....what symbol do i use

3.....i've been reading the book.....im still confused on the correcting part.....how do i know if my car is running lean or rich......and how will i correct it

4.......under the etc menu the last thing is initalize......when do i choose yes...

5 is it possible to set this up to have a economy setting for driving around and when you need the power to have a performance setting......

thanks,
space

Can't answer those questions until you remind us what year car you have...

my bad guys.......2000

Do you have an EGT gauge? It's the only surefire way anybody's found to tune the MY00's.

figures.......i dont have one

could i take others setting and average them and start from there........or will that just screw things up.....

thanks,
space

I don't think that we've yet to establish baseline tuning numbers for the AFC on a NA MY00 yet. Some people are tuning via the rear O2 sensor while others like myself are using an EGT gauge. I've found that it runs rich below 3000 and lean above that. I'm running a -4% correction to correct the richness & a +4% correction to correct the leaness, but I'm still working on fine-tuning these values. I'm pretty sure on the -4% part, but as to whether +4% is too low or too high, well, I haven't gotten that far yet.

now is that +4 or -4 for hi throttle or low

thanks,
space

Low throttle doesn't really do anything for you because the car's running in closed-loop mode. This means that it's looking at the O2 sensor readings & constantly adjusting & optimizing the A/F mixture. When you go WOT, the car enters open-loop mode and uses a preprogrammed A/F map. This aren't the most optimal A/F ratios you can use, especially if you've added an intake and exhaust, so this is what you tune with your AFC (hi-throttle).

Edit: mixed closed up with open

[This message has been edited by RidinLow (edited November 03, 2000).]

I was just about to say that http://www.i-club.com/ubb-files/smile.gif

I have my hi-throt. set at 98% and do all adjustments there only.

actually, I have my low-thottle set at like 1% and at lowest possible rpm setting I have it enriched +2%. For some reason the car will idle rough if it is at 0%, and will sputter and sound like its gonna stall at -1% I figure its just some resistance in the extra length of wire or something.

-Jeff (SkinMask)

[This message has been edited by SkinMask (edited November 03, 2000).]

skinmask,

what are your percentages in the high range?

also im wondering if you dont do no correcting on low end, and only in high end then what about the percentages in between?

also when you set your percentages, when does it take affect.....

please bare with me on this.....i learn slow

thanks,
space

Skinmask,

Good idea on raising the hi-throttle point to 98%. I just realized mine was set at 65%.

At what throttle position does the car enter open-loop mode?

Hmmm... Something here doesn't sound right, while it sounds right.

JC Sports set the lo throttle for 15% and the hi throttle for 50% - so does that mean we go into open-loop at 50% ??

Larry www.ImprezaRS.com (http://www.ImprezaRS.com)

Larry,

The S-AFC's "Hi" and "Lo" settings are independent of the ECU's decision to enter open-loop mode. I believe the ECU uses a combination of factors to determine just when and where to go open-loop; perhaps similar to how it decides when to downshift an auto tranny for "power".

Your 15% and 50% settings merely sets the map points that the S-AFC uses:
1. Thrt < 15%: correction is fixed at your "Lo" setting.
2. 15% <= Thrt < 50%: correction is interpolated between 15% and 50% settings.
3. 50% < Thrt: correction is fixed at your "Hi" setting.

I think the "Hi" point should be set relatively low if you are having problems with correction at midrange. This ensures corrections closer to numbers in the "Hi" table, rather than interpolated ones. But if your driving style is mostly in the low-end, and with direct excursions to WOT for power, then you can set the "Hi" point to suit.

Well, that's the theory... As is the case with many control theories, it doesn't always agree in the real world. Like MattC, I'm also getting detonation at midrange, but the S-AFC has little effect on fixing it. My temporary solution to that problem is to downshift so I can pass through midrange as quickly as possible, or avoid it altogether. (It's about the only time I wish I had an STi motor.)

-WaC
Wayne

Edit: added theory.

[This message has been edited by wac (edited November 05, 2000).]

I guess what I meant was, did JC Sports choose the 50% setting for hi-throttle because they knew it went into open-loop there?

I have a turbo that like the extra fuel with boost at partial throttle, so I was not planning to raise the hi-throttle point to 98%. Also, John at JC says the AFC is wired into my car in such a way thet the ECU will not re-learn the AFC settings, and that the partial throttle settings will work.

Larry www.ImprezaRS.com (http://www.ImprezaRS.com) www.SubaruPlanet.com (http://www.SubaruPlanet.com)

larry that is the default setting ont he afc for th setpoints. i dont think JC changed them. i think that the ecu doest change till 100% full throttle
tom

quick ?

when i do the +/-(x) (let x be some number on the AFC correction graph) do i then go to the etc. menu and select initialize or does it automatically adjust the fuel when i move the x up or down....

thanks,
space

It'll automatically do it. Don't touch initialize, it'll just reset everything!

...did JC Sports choose the 50% setting for hi-throttle because they knew it went into open-loop there?

Kartboy's right. If anyone knows exactly when open-loop starts to happen, please enlighten me.

I have a turbo that like[s] the extra fuel with boost at partial throttle...

Yes, your turbo install has been well-publicized, and I'm happy for you. http://www.i-club.com/ubb-files/wink.gif

...John at JC says the AFC is wired into my car in such a way thet the ECU will not re-learn the AFC settings, and that the partial throttle settings will work.

The original design of the S-AFC is supposed to work that way - to fool the ECU seamlessly. I doubt if JC did anything special with the S-AFC for your car as compared to the rest of us.

-WaC
Wayne

I have tried adjusting the AFC for part throttle, and have not seen much difference in the A/F reading... this is why I set my hi-thrt point high and do all adjusting there... because the ECU should do its own mixing at part throttle (open-loop mode)

The AFC corrections probably do make a difference in open loop mode, but probably not as big a difference, since the ECU is adjusting for all the other sensors on the engine anyway...

-Jeff (SkinMask)

didn't someone mount a new a/f fuse of the correct voltage in the MY00. that would give you a surefire reading wouldn't it.
Or should I stick to the newbie forum

wac,

I resemble that remark!

Larry