S-afcII Air Correction Factor Setting

[RS12Turbo]

I know every engine is different, and I should wideband tune it, but I'm just curious what a good baseline setting would be for the Air Correction setting on a ca18det with t25g, front mount ic, full 3" exhaust with ss auto crap split chamber 02 pipe, big mouth blitz cone filter, and boost at 13-14.I just started screwing around with it, and currently I have as follows...........

Hi-Thrtl @ +5%Lo-Thrtl @ +4%TH-Point at the preset LO 10%, HI 50%

Thanks for any suggestions
Modified by RS12Turbo at 3:47 PM 3/7/2007

[r34 gtr]

+/-? ive got -6% low and +2% hi for mine (with 510s and the gt28) and it runs like a$s. dont use my settings, they suck. im taking my safcII out and burying it in the yard next week.

[RS12Turbo]

oops.............

+5 Hi thrtl+4 Lo thrtl

[r34 gtr]

what all is done to this motor? sorry i should know by now but im dumb...and several beers in the hole. the novelty of being 21 has NOT worn off yet, plus it was a hard day at work (painting inside of houses, this past few days have been kitchen! gah! it sucks!)

[RS12Turbo]

what all is done to this motor?

Read the first post

[r34 gtr]

you know i cant read!

[RS12Turbo]

+/-? ive got -6% low and +2% hi for mine (with 510s and the gt28) and it runs like a$s. dont use my settings

I know when I tried -4 or -5 for the low, mine would start idling like crap.......+4 makes it idle slightly better than 0.

Know one wants to fill me in on some good basline numbers?

[r34 gtr]

mine too idles like crap. ive got it at +2 on my big injectors just so itll idle when warm. just doesnt do it when its cold. i dont know if anyone on here can give good baseline numbers. most people are too cool for the safc, or are only using it to fine tune a re-flashed ecu. you're in bham, take it to walker dynotune in trussville or something. dude seemed to know his safc's.

[RS12Turbo]

Hmmmm, I'm actually in Trussville. I'll have to look them up

[r34 gtr]

ok, i went and checked my settings because one again, i got into it and it knocked. whee. it was only 194 this time so not quite as bad as before, but still gay. anyway, my correction points are the preset ones: 800, 1400, 2200, 2800, 3400, 4000, 4600, 5200, 5800, 6400, 7000, and 7600. for LO i have: +2, -2, -4, -3, -2, 0, +2, +3, +4, +5, +6. for HI: -1, -3, -5, -3, -1, +3, +4, +5, +6, +7, +9, +10. it knocked at ~6800rpm with 65% throttle, so im gonna go back and fix it. i know the maps cross up a bit, but it seems to work for me. this is fmic, gt28r @ 10psi (? damn autometer), 510cc injectors, intake, catback w/ stock dp and cat (which has no material left, hence flames), etc. etc.

[RS12Turbo]

out of curiousty, how did you come up with your numbers?

[RS12Turbo]

out of curiousty, how did you come up with your numbers?

Bumpty bump........

[c-rad]

Why are ANY of you in the + side? All that will do is get you closer to hitting fuel cut. Aside from that, the factory ECU runs rich and you need to lean it out to make more power. And from my experience with SAFCs the throttle points should be low-30% and high 70%. Secondly, and just offering my opinion, I don't think its too wise to "mess around" with the settings unless you have a wideband.

[c-rad]

ok, i went and checked my settings because one again, i got into it and it knocked. whee. it was only 194 this time so not quite as bad as before, but still gay. anyway, my correction points are the preset ones: 800, 1400, 2200, 2800, 3400, 4000, 4600, 5200, 5800, 6400, 7000, and 7600. for LO i have: +2, -2, -4, -3, -2, 0, +2, +3, +4, +5, +6. for HI: -1, -3, -5, -3, -1, +3, +4, +5, +6, +7, +9, +10. it knocked at ~6800rpm with 65% throttle, so im gonna go back and fix it. i know the maps cross up a bit, but it seems to work for me. this is fmic, gt28r @ 10psi (? damn autometer), 510cc injectors, intake, catback w/ stock dp and cat (which has no material left, hence flames), etc. etc.

You car must run INSANELY rich. Your lo-throttle point settings should be somewhere around -25% (injectors are 28% larger). hi-throttle needs some widebandage tuning to get the numbers even remotely close. Death to all SAFC's!!!!!!

[Darius2250]

Hey C-Rad I am running an SAFC II and I noticed you said low -30% should it be just low 30% and High 70% I am running the base 10% and 50% I do have a Wideband I have just go the car running after a long stint of sitting. THanks for the info.

[RS12Turbo]

Why are ANY of you in the + side? All that will do is get you closer to hitting fuel cut.

I've just started screwing around with mine, so it's a learnig game for me, since I don't have a wide band, and the instruction manual is pretty vague.......and I did hit fuel cut the other day @ 13psi with + low and high settings.That's why I asked what basline settings I should start with.......so again if anyone knows some good baseline numbers please let me know.I have stock injectors, stock maf, t25g, walbro 255

[mikesim]

You car must run INSANELY rich. Your lo-throttle point settings should be somewhere around -25% (injectors are 28% larger). hi-throttle needs some widebandage tuning to get the numbers even remotely close. Death to all SAFC's!!!!!!

it doesn't work exactly that way. remember, you're using airflow correction, not actual fuel correction. you'd be on the ball if it were that easy. the AFC is modifying the MAF sensor reading, telling the car there's more or less air coming into the engine.

from my experience on the dyno, +1 or +2 greatly affects NA cars, and as little as +5 can drop AFR on a turbo car from 14:1 to 12:1, depending on boost, and fuel injectors.

i have DSM 440CC's and when i dynoed (mustang dyno) with stock AFM, most of my numbers were still +3 to +5. there was a fat part going into boost which even -2 didn't change much. i think with an AFPR, we could have cleaned it up more.

when i switched to an RB26 MAF, all my settings went out the window. it's now in the +8 to +12 range, except for idle, which is +4 or 5.

Always use a wideband guys! and if you can, BURN YOUR AFC's! buy a power FC or AEM already. the lack of ignition timing control and true fuel control really shows inferiority of S-AFC's.

[r34 gtr]

z32 maf? it wont run when im on the - side of the correction curve. i know the safc sucks balls. i must be getting knock from lack of timing control. my fuel pressure seems to be fine, so its not that. i HATE the safc. it is the single biggest piece of crap when it comes to tuning. msII will be on soon enough though, parts go to the machine shop next week.