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Old 02-01-2001, 10:24 AM   #1
Scooby Specialist
Member#: 3768
Join Date: Jan 2001
Location: Seattle, WA
Post Apex'i S-AFC ?

I have had a S-Afc in my car. I have 5Zigen Fireball 2.25" catback, and cobb tuning cold air intake. Can you guys give me an idea of what I should set my settings at.
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Old 02-01-2001, 10:28 AM   #2
Scooby Guru
Member#: 329
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: NJ
1995 325i
Arctic Gray


It varies from car to car. Get an EGT gauge to tune with! You shouldn't be blindly using someone else's recommended settings... you won't ever know if you're running excessively rich or lean.
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Old 02-01-2001, 11:06 AM   #3
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Member#: 2491
Join Date: Sep 2000
Chapter/Region: South East
Location: Charlotte, NC
06 Miata
81 Fiat Spider


I agree! That's why I ordered an Air Fuel Meter today! I decided to get it and install before I put my S-AFC in! I though maybe this would also give me some idea of where the car was running rich and where it was running lean, before I go to correct it with the S-AFC. Just a thought!
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Old 02-01-2001, 03:05 PM   #4
Scooby Newbie
Member#: 2328
Join Date: Sep 2000
Location: Lincoln, Ne, United States

I just put mine in. I have JC sports intake, 2.5 N1 cat-back exhaust. and the pre-turbo guages (Air/fuel, Engine temp.,Exhuast temp.) I will tell you that the only way to do it is set every value to zero find where you car is running rich/lean if it is a '00 like mine it should run rich. I cured mine pretty much. Did you get any settings from anyone? You set up anything yet or is it unplugged? If you want settings right now call Rallispec and ask them if they could help you out? They are great people and I trust them and I haven't even met them before. Ok I will go off memory what I know for now since I am at work and don't have the sheet in front of me.

First go to settings to pick cylinders and set it to 4cyl.

Go to the arrow beside it and set it to the upward position on the screen.

Go the throttle settings and set the low to 10% and high to 65%

Set the Ne points starting & 2500rpm and increase 500rpm untill you can't set them any more. I think there are eight and you should end at 6500rpm.

Set the sensor type to pressure

Now the fun and headaches start. You have to watch what you do and see how you car runs because none of the settings are the same. You just have to play with all of the Low and high throttle points to see what works best. I would give you mine but I don't want you to run to lean or rich because no ones engine can be set the exact same. You have to set the Low so that the car stays idling good and not rough. Set the High's at %'s where you know it is running to rich or lean.
Then from there on out be watching and feeling how the car runs and reacts. It is best to have a friend ride along and mess with the S-AFC while you drive. Be careful when tuning by the seat of your pants and if you have and EGT or Air/fuel it is best. The Air/fuel may not be the best because it doesn't give a quick and precise measurement right away since the gases have to travel before reaching the O2 sensor.

If you have any problems or questions e-mail me at [email protected] and I can try to help you out.

I will get back to you on the settings to make sure I didn't miss anything! Hope this helped you out sorry it was a novel!

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Old 02-01-2001, 04:40 PM   #5
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Member#: 627
Join Date: Dec 1999
Location: boston
MY96 outback wagon


go read Wac's SAFC Tech Notes in the links section (it'll answer most of your questions if not all)

that said, the general rule for MY00 is to reduce fuel below 3500-4000rpm, and add fuel above that... but like what RidinLow was saying, get an EGT gauge

A/F ratio gauge works too, but remember that the relationship between the air/fuel ratio and the output voltage is NOT linear
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Old 02-01-2001, 05:29 PM   #6
Scooby Newbie
Member#: 953
Join Date: Feb 2000
Location: Vancouver/Westend

You know what you should do... the next time the Washington guys come up to Vancouver for a meet, join them...

Bring your car to Tecknik Moterwerks (Minnam Racing) to dyno tune it... it's going to cost some money... but I'd trust a professional than myself!
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