2nd Generation Specific 1986-1992 Discussion

AFC Settings,Tuning, etc..

Old 01-19-2006, 04:27 PM
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Installed the afc today, left the o2 sensor plugged in, thinking i might unplug since i have no cats, not sure?



That said, my car dumps some serious fuel, i dont know why, the engine was fresh rebuild when i bought it, mild street port. Maybe the injectors are new I dunno, na's always seem to dump a little extra fuel.



My throttle settings 50%low 80% high



My low correction at idle 10% then i brought it down 2% at a time to 0 at 4000rpm high is a strait accross the board 3%.



Guess i need to get a af meter and do some tuning. Anyone else running afc on na?



Was happy that i got an older afc with out the rotary dial, i had the button one on my t2 and liked it best.
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Old 01-19-2006, 06:12 PM
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what are your settings for the car setup?



I would go with a TPS setting of 0 to 100%
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Old 01-19-2006, 08:01 PM
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Originally Posted by Cheers!' post='795178' date='Jan 19 2006, 07:12 PM
what are your settings for the car setup?



I would go with a TPS setting of 0 to 100%


I have it set as a 4 cyl with the arrow up, i think thats wut u were asking. wuts the advantage of goign 0 to 100?
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Old 01-20-2006, 07:17 AM
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Originally Posted by phinsup' post='795218' date='Jan 19 2006, 09:01 PM

I have it set as a 4 cyl with the arrow up, i think thats wut u were asking. wuts the advantage of goign 0 to 100?


So then you are adjusting the fuel curve all the time. Meaning you can tune the partial throttle cruise for better MPG.
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Old 01-20-2006, 07:45 AM
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Even a cheap narrow band AFR gauge would help here.

My idle (1000RPM) setting is -6%.



First - You want the o2 sensor working.

At light throttle & light vacuum, the ECU needs it to go closed loop & lean the AFR.

When it's in closed loop, the AFM signal is ignored, since the o2 sensor is controlling.



When decelerating (0 THR & high vacuum) it does a fuel cut, so the AFM is ignored.



Only when accelerating does the AFM signal (along with the AFC) control the fuel.

Now the big deal is how much fuel, above or below the stock map will work with your pump/regulator/injectors.

A short session with a borrowed wideband will tell. Otherwise you have to carefully keep tweaking the AFC until the AFR suddenly goes lean, then push it back up some.
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Old 01-20-2006, 10:53 AM
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wideband is the way to go
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Old 01-20-2006, 07:17 PM
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Originally Posted by sureshot' post='795288 View Post
wideband is the way to go


Well find someone to loan me one damn it!!!







You guys think the local dyno shop has one for shop use?
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Old 01-20-2006, 08:57 PM
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if you want a cheap a/f guage i can practicly give you one almost brand new in perfect condition autometer with black bezell and black face. I think its in a box at my townhouse right now.
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Old 01-20-2006, 09:00 PM
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All a narrow band a/f meter is going to tell you is if you even in the ballpark, find someone with a wideband.
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Old 01-20-2006, 09:00 PM
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Hook it up g dawg edward hands
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