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Old 01-16-2001, 12:15 AM   #1
ac_gohan
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Member#: 1903
Join Date: Jul 2000
Location: Bay Area, I-Speed Tech
Vehicle:
2000 2.5 RS-T coupe
T3/04 Link'd 2 10 PSI

Post S-AFC tuning need help



i recently installed an AFC and i need some help tuning it. I set the high throttle position to 70 and low to about 30. I need mid and high end power so i tweaked a little at high rpm but not enough to feel anything. I need some % decreases of fuel at high rpms. any idea of what? Anyone out there tune sucessfully to feel a difference in power. I want the best tuning numbers that produce the best results any advice is appriciated. thanx guys
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Old 01-16-2001, 01:30 AM   #2
bratmantlz
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Member#: 3231
Join Date: Dec 2000
Chapter/Region: RMIC
Location: colorado springs colorado usa
Vehicle:
88 626 Turbo
white

Lightbulb

have ya tried a search or impezars.com i think he has some afc stuff there.
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Old 01-16-2001, 07:46 AM   #3
cj917
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Member#: 627
Join Date: Dec 1999
Location: boston
Vehicle:
MY96 outback wagon

Question

have you gotten yourself an EGT or A/F ratio gauge yet? and what year is your car?

unless you already have intakes and exhausts and other mods that made your car run rather lean or rich, i don't think tweaking the AFC setting would make any definite noticeable result

[This message has been edited by cj917 (edited January 16, 2001).]
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Old 01-16-2001, 09:18 AM   #4
Sean McElderry
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Location: Beaverton, OR, USA
Vehicle:
1995 Supra Turbo
Red

Post

First of all, set your throttle points back to 10 and 50. Those are good settings. For the most part, no changes you make to low throttle will affect your car's fuel delivery since you're in closed loop mode at that point. So do not alter your car's fuel delivery for low throttle. It is true that you CAN alter your car's fuel delivery for low throttle using an S-AFC, but why do it? You're not making power at low throttle anyway, so leave it alone.

At high throttle, decrease fuel in 2% increments from 4k-redline. Do 3rd gear pulls from 2k to redline in between each setting change. You'll start to feel the power increase. Repeat this process until you start to feel the power decrease (loss of torque). When you do feel the power decrease, then add in 2% fuel from 4k to redline and call it good.

Sean
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Old 01-16-2001, 05:06 PM   #5
ac_gohan
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2000 2.5 RS-T coupe
T3/04 Link'd 2 10 PSI

Post


yes i do have an egt and a a/f ratio gauge. thanx for the tips, but is there a limit that you should stop decreasing fuel at? Is it safe to stay below 10% or as long as you dont go over 1500 degrees. Also when does the torque loss usually kick in? yes i have an intake and when i get my exhaust will the settings have to be changed again? i need high end power here.... thanx guys
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Old 01-16-2001, 05:48 PM   #6
cvalle-sd
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Location: The LBC, CA, USA
Vehicle:
2001 Cr-V
Silver

Question

I'm also using an ITC; If I start cutting fuel back above 4k, I assume it'll affect how I could/should advance the timing. Assuming I use 92 octane, any idea how much advance (up to +15deg) I should use? Any what's your AFC curve like? I have been ADDING fuel up to this point (I have a 99) - am I out of it, or is the fule cut thing for 00/01 cars?

Thanks in "advance", heh heh.
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Old 01-16-2001, 07:26 PM   #7
cj917
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MY96 outback wagon

Post

i aim mine at around 1400F degree, and even that, sometimes, depending on engine load, it'll go a bit higher or lower, but stays between 1300 to 1500... dont know how fast your EGT probe reacts, but try not to go over 1500F

again, what year is your car? i have a MY00 and i have -4 below 3500rpm, 0 at 3500, and +4 to +6 above that to redline

you might wanna check out wac's AFC FAQ if you haven't already seen it
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