SAFC II
 

well i bought an Apexi SAFC II now cuz the one in my car flipped the hell out and made the car die on the way home and i had to half rewire my**** in the dark with a lighterto get the POS to run again. im beginning to wonder if this this wasnt half my problems to begin with. now i sit here scratching my head trying to figure it out. I have a wideband a/f ratio gage, where abouts should i tune the ratio to at WOT. i know it should be on the rich side to help avoid knock but im not sure how far is too far. My logger isnt working right either, i think when my alternator **** out it took some stuff with it at about 18 volts.
Iveheard people say the knock display stuff on the SAFC is worthless to a DSM because of its "microphone" type sensor and you should only go by the logger. i dunno just going by what i hear.[sm=headbang.gif]
i wonder if i coudlnt make a GM knock sensor work with the SAFC only to give it a functional signal.
Definately something im gonna try to work with and will post it if i figure it out.

RE: SAFC II
 

WOT tuning with a wideband and pump gas, the WB should read 11.1 bud.
I can't comment about the SAFCII because I've never used one.;)

RE: SAFC II
 

lol 11:1 is rich holy hell, whatever keeps the knock gone. i run 94 octane pump gas BTW. i might be able to get away with a hair more timing than some people. If imreally gonna crank the boost up to 23-24 (when the 20g was alive) i mixed 50/50 with 115 octane UNleaded race fuel.

RE: SAFC II
 

I agree with coupe. 11.1 is good. You probably could get away with 11.5 but no higher than that. And The knock is useless on a dsm. So dont even worry about it if you get readings

RE: SAFC II
 

What size turbo/boost are you running.. I could get my settings off my SAFCII and give them to you so you are close.. But if your runnin a smaller setup were gonna have to adjust a few things..

RE: SAFC II
 

RRE has a good start for settings
http://www.roadraceengineering.com/newafcsetting.htm

RE: SAFC II
 

NEVER use someone elses tune... it is a very bad idea. I know your trying to help but still.


And yes 11.1-11.6 on pump is good area to stay and yes the knock readings for a DSM is usless with teh SAFC.

RE: SAFC II
 

i'll be back on the 20g with around 25-28 psi once i get evrything back up to par.

RE: SAFC II
 

Emonz, he is running just about the exact same thing that I am.. Just he will be pushing a higher boost later.. But to get it running he can boost about 15 for now and use just about the same settings.. Granted it will be a little bit different but not enough to hurt anything.. After playin around with mine, the settings someone else had on theres was extremely close to what I have mine after tuning it.. The difference between the 2 wasnt much and didnt effect it much.. Im just talking about the low throttle and high throttle. You can turn them all the way down or upwith the SAFC and it will just run rich or lean, but it wont hurt anything..

RE: SAFC II
 

Ya andhe would be afoolto borrow a tune. I dont care if you have the same setup every car runs different and when they are used cars there will be ever more un alike. Your tune "could" be somethign to start with but what if his injectors are alittle clogged more and he floors it and he starts running lean and causes knock and detination it would end badly ya know.

I would strongly advise agianst it. tuneing an SAFC is one of the easiest things to do one a car

RE: SAFC II
 

good because you can walk me through tuning the neo then:D

RE: SAFC II
 

seriously it is soooo easy once you get it installed its not even funny... im not sure bot the NEO if it is different or nott

RE: SAFC II
 

Im cussing at it.... i can build engines, i can make any computer work be it widnows, linux whatever version, i can fix anything on a car but i started cussing at the AFC and came back in the house. I amaze myself at how dumb i can be some days. ill try again tomorrow when my brain will hopefully work beyond a 2 year old level.[&o]i just know it was idleing, i changed something it poured a huge cloud of black smoke & stalled so i left it sit in the garage. i worked 12 hours today and im the foreman so my brain is beyond overloaded when i get home.[&:]

RE: SAFC II
 

yea i would look at that RRE site, because even if the actual tune itself on there is no help (which my guess is the case) then at least it tells you exactly what all the settings should be such as sensor type, and car select

RE: SAFC II
 

According to emonz you cant do that ;)

I suggest that however.. I dealt with this about 6 months ago, and it was close enough to get my car running so I didnt have to look at it in the garage. Granted you won't want to take it out and be running it as hard as you can, but it will get you by daily driving until you can get it tuned..

RE: SAFC II
 

it adjusts in 50 rpm increments and other stuff but i cant think right now

RE: SAFC II
 

not for permenate use. thye are guiding you on HOW TO TUNE not what to use for a setting. be my guest and borrow anyones tune you want all I am saying is the car will not respond as well and may knock more or less than the other car. Better safe than sorry in my book I like my working motor

RE: SAFC II
 

I think i have it tuned pretty good,the A/F ratio isstaying between 10.9 and 11.1 throughout the RPM range.
I'm still a little confused why my airflow sensor is really jumpy at high RPM.. Heres a quick picture i got with my cell phone of the graph with just the Karma display, is this MAF overrun? thats a pull in 3rd gear from about 3500 to 5000 RPM, pretty much right as the turbo spooled up i held it for maybe a second then backed off, but its got a quick drop once it gets up so far.

[IMG]local://upfiles/10240/5B76AFB18E57487FAB5C8EB7FB7EB451.jpg[/IMG]

RE: SAFC II
 

Just curious what are your settings advocate,ill compare them to mine, maybe fine tune towards yours and see where it goes. i still have to figure out how the get the deceleration part to cut down the fuel it backfires like crazy when coasting. havent had much time to mess with it.
whats the difference in teh SAFC II and the neo ? Im still new to all this **** but i catch on really fast.
6 months ago was the first time i ever touched a DSM and now evryone comes over to my garage for help since i got mine faster that theirs.:D

RE: SAFC II
 

well what are your tune percentages and what are your NE points set at. Cuz maybe your not tuning the higher rpms correctly.

RE: SAFC II
 

aperently the NEO tunes 50RPM inrements the SAFCII does only 200RPM. Which doesnt make much difference in that sence cause the have you tune those things in 600RPM incerments anyway. Im sure teh NEO has more on top of that though

RE: SAFC II
 

Ok so on a stock GSX ( my beater) 14b, stock as it gets. What would be the fuel correction % for putting on a 2g MAF? Im putting a SAFC II on that heap of **** also. I have bigger injectors if i need them but i'd like to leave the stock 450's in. Wouldnt too much correction start getting into the fuel cut of the ECU early? You can get 50% correction either way on the afc2
or should i just hack the 1g MAF thats on it and readjust the afc
im gonna end up making the ugly rusty car the fast one just to mess with people:D

RE: SAFC II
 

i cant really tell you exactly what a correction is gonna be. Its a guess and check type method. Just change the % a bit and see the cars reaction and keep trying new #'s. Because your tune is going to be non linear. As the rpms increase, the percentages will increase as well

RE: SAFC II
 

this is a horrible idea dont do that. If you dont have a wideband then dont change the corrections. DSMs on stock fuel can hardly be changed anyways. If you lean it you your gona start knocking and detonation

RE: SAFC II
 

Im going on that he has a wideband

RE: SAFC II
 

did he say he does? dont assum your telling someone to do something retarded all because you assume one thing

RE: SAFC II
 

from his veryfirst post. So what i said is fine then

RE: SAFC II
 

I have a wideband in both of my cars;)
The GSX im getting the crazy MAF fluctuation on the graph -
i know i can get confusing having 2 cars -one pretty much stock and the other with lots of mods
Thetalon i got tuned really nice i think now, its snowy & ****ty so im leaving it sit in the garage.- thats the car with all the mods. Sorry to jump off to a different car on the same thread.
my GSX (almost stock) is where im having problems now, i think im getting MAF overrun. its showing a peak of just over 1900 Htz but its crazy all over the scale by 1600 Htz, i see the Htz with sudden random drops on the graph down to 400-500 sometimesand i feel the engine ****tin out along with it from going lean on & off so fast like that. I thought they usually made it to 2100 before they went nuts, but its 15 years old anythings possible. I turn the boost down to 12 and it still does it just at a higher RPM. There are absolutely no boost leaks whatsoever on that car & it'll actually hold pressure after unhooking the air hose for quite a while.
Thats why i want to either hack the stock 1g MAF and hope it cures it, or put on this 2g MAF and hope it works considering i have no clue where it came from or if its even the right one. I took the lower honeycombs out of the stock MAF already and adjusted the AFC up a little untill it came back to 11:1 but then by 5500 rpm the MAF still goes crazy. its a stock 14b with the inducer about half burnt off the turbine running 15-16 psi - spikes to 18 for a split second. As it gets beyond 5800 the boost will fall off from 15 to 13 by 6200 where i normally shift. Thats expected out of a turbo in that bad of shape. i'll put my good 16g on it when i get the MAF straightened out or whatever is causing the crazy fluctuations.
With the 2g i doubt ill be able to compensate enough fuel without putting in a fuel pump and some bigger injectors i have laying here. Its a rusty heap so i really dont wanna go anywhere near fuel lines on it. [&:]
Ill try anything, its not gonna break my heart to let this rattly ass 240,000 mile engine detonate a few times till i can tweak it. i just dont know where to start if i go either way. If i blow it up ill laugh at it and put another motor in it.
Thnaks for all the input so far:)

RE: SAFC II
 

Right now I have the noro virus so im not doing much other than making often trips to the bathroom.. But On an average mines running around 30%. It starts out lower, but higher rpms is around that.. Im running bigger injectors and a bigger turbo, so you might want to try it around 10% on that 14b.. I wouldnt think you would need a high correction with what you have on there... Ill try to get out in the garage this weekend once im feelin better and check all my settings and let ya know..

RE: SAFC II
 

I'm up to 21% on it and cant seem to get enough fuel before i get fuel cut. I'm only running 15 psi.
On the afc readout, is the Karman Htz displaying what is actually coming from the MAF or is it showingwhat itssending to the ECUwith compensation?

RE: SAFC II
 

I cant remember what your GSX has.. Its a 14b turbo with what size injectors?

What do you have your lo and high throttle position set at?

RE: SAFC II
 

GSX is 14b, 1g MAF with lower honeycombs removed, stock 450cc injectors. i has 2 1/2" exhaust i made up for it & no cat.

RE: SAFC II
 

and your getting fuel cut at 15lbs? You should be up around 18-20 before you start to get fuel cut..

RE: SAFC II
 

could be a small boost leak. My car was fuel cutting early and it seemed to keep getting worse until I change the shaft seals in teh Throttle body and it stopped leaking from there

RE: SAFC II
 

Oh yea myLow / Highthrottle points are 30 / 80
i have a very very small boost leak at the TB shaft seal, not enough you can even hear it leak, it makes bubbles really slowly, and it dontstart bubblingtill 20 Psi. Im getting fuel cut when i turn the fuel up past +19% on the AFC, my MAF is going absolutely crazy past 5500 rpm and the ECU is seeing 1900htz at the most. Thats right where it starts to run good(in the range of 11:1 a/f ratio)then it wants to cut on me.
when it cuts its not always the brick wall slam you get, its really mild sometimes but when it does it theres a drastic drop in Htz down to 300 or 400 sometimes. Thats why i took the honecombs out of the bottom half, but it didnt really help it much. I think im just over running the MAf or its just junk. the graph scale is jittery up & down then the higher it revs the more drastic it gets untill its jumping from 1900 to 300 back and forth. looks like a 4 year old scribbling with a marker on the graph scale. My peak Htz was 1938.
I have some 560cc injectors ic an put in but the MAF is still going nuts. i may have to let more unmetered air past it so it quits.

RE: SAFC II
 

any kind of a boost leak is bad sall or big How did you pressurize it to tst it all? I figure you id everythin th right way by your post

RE: SAFC II
 

I made a deal similar to what you see people selling to hook up on the inlet of the turbo. then i started turning up my air regulator untill i got 20psi on my boost guage with the throttle plate open. I hosed it down with soapy water, found a few small leaks and fixed them. the TB shaft seal is like a slow leaking tire, it take almost 30 seconds to even make a bubble. Even if i open or close the throttle. to worry about one that tiny is gettin too picky for me.

RE: SAFC II
 

Ill be starting over with the GSX, i got a 255LPH fuel pump, AFPR 1:1 rise rate, and gonna put my 550cc injectors in. and switch over to a 2G MAF.:eek:and the 16g. its an EvoIII, i thought it was a big 16g.
45 Psi base fuel pressure a good place to start? since the exhaust fell off tonight after bashing it down an oil well road i might as well bend up some 3" pipe for it.
its gonna be so fun to stomp the **** out of some ricers in a rusty ugly ass car.:DRust is less weight - makes it faster lol
i'm just gonna have fun with it untill it dies then probly sell some of the parts and keep all the drivetrain for my talon.

RE: SAFC II
 

i think your fuel pressure at idle is supposed to be somewhere around 27psi

RE: SAFC II
 

I meant with the vaccum line unhooked.