Apex SAFC 2
 

what do you guys have yours set at for specs? I just installed mine on my 87 gxl n/a and have just started to tune it very minor. just kinda seeing what others have theres set at

you do NOT want to use others settings
either try it out yourself or leave it at 0
or get a shop to do it for you
every car is different

why do you need a S-AFC in a N/A?
just wondering.. I have never heard of anyone doing this.

Super AFC's are piggyback ECU's used to tune fuel. So when ppl get bigger injectors, they can tune them, so the car wont drive all fucked up

The N/A is also naturally rich.... supposedly you can tune 15hp by leaning out the gas. By leaning it out you can almost save nearly 20% as much gas and hydrocarbons in the environment (to be positive I will not tell you about the nitrous oxide killing the environment)

If anybody wants to give me an s-afc please feel free :).

i got mine for like 250 shipped brand new

What he said. You have no proof that any settings you're given will be safe or suitable for your engine.

Same reason you need one in any other car. To allow you to adjust the mixtures to a more performance-oriented tune that suits your mods.

Then you're a little behind the times... ;)

Nitrous Oxide is a lot different than oxides of nitrogen, which is the NOx that some emissions tests for...

n2o vs nox
big difference here....
n2o is good for getting high

For a short period of time I put a SAFC in my wife's 86 n/a. I used a safc and a wideband and I guarantee you that the car will run crisper with a leaning out of the mixture.

I can also put a non turbo afm in my turbo cars and adjust the mixture using the safc and wideband to make the turbo car run just fine. It's still a leaning out process.

i've got a safc II and still have it with no corrections thus far...i just like watching all the stuff it displays while driveing lol :p:

I'm real tempted to tell you to take out about ten percent on the high across the board from 3000 rpm all the way up to 8000. But I won't because I'd get ragged on for possibly harming your car (it won't).

I use a wideband. Wideband cost bucks. People don't wanna spend bucks. The alternative is to go to a *tuner* or dyno shop.

One thing you can do while waiting, is to maybe add fuel to the lowest setting (800 rpm) and watch it change your quality of idle. Now that can't harm a thing. I'd bet if you add about three to five percent it will idle a touch smoother.

WHERE????

I'd guess E= BAY

hmmmm maybe i should try it
i have only found one for 329.00
but i will shop around more

^ you should be able to find them ALOT cheaper. My friend just bought one for $150 (it was used though).

i want one, i need tp up my gas mileage prices are rising and i need to spend money elsewheres like getting muh roof fixed

well i do want a brand new one but i did find one now for 219.00 w/ 35.00 shipping
so 254.00 not too bad

Could you give an unofficial clue for a stock S5 turbo? If all these car run rich, would it be reasonable to take 10% off this one too, just for starters?

Also, is there no way to do this with the stock O2 sensor? I realize it could never be as accurate as the wideband, but could you not read the O2 sensor voltage from the ECU at different rpms and adjust conservatively?

does the safc2 run fine in the s4's.... only reason i ask is b/c i had a Probe GT turbo and it used the same style VAF sensor for intake air metering. It was also claimed that an SAFC could not be used b/c the voltages were weird on the stock probe/mx6 metering system..
is this true to the rx7 also...

87 rx7 base no mods.... well except for the full exhaust and s/c kit waiting to go in once i figure out what im going to use for a EMU

mine runs fine with my s5 n/a...just read up on how to wire it up PROPERLY and you'll be fine

Mine works fine in my S4... the wiring manual includes specific wiring directions for the S4. If it's incompatible with the stock AFM, someone forgot to tell my car about it.

There are companies on eBay selling SAFCs for around $250 shipped, new in box.

If you install it yourself, solder the connections. You can use their little plugs, but solder them on to the wires after crimping them. It's not worth troubleshooting goofy little issues caused by a flakey connection. They're not *that* difficult to get at, but it's a pain to work down there (at least if you have an older back), and it's worth the time to do it right the first time.

The stock O2 sensor is somewhat useless for tuning. It'll tell you "rich" or "lean." That's about it. You might get a tiny bit more feedback right around stoich, but don't count on it. I tied my O2 sensor into the second input on the SAFC, and the stock ECU settings have it pegged at 0.9v constantly (unless I'm in decel fuel cut).

If you're installing on an S4, I would suggest using the MAP sensor. All sorts of reasons, including the fact that the throttle sensor on the S4 covers about 1/4 the throttle range, and the fact that the engine is under full load at fairly low throttle opening angles at low RPM (not pulling a lot of air in, doesn't need wide open throttle plates to pull what it needs).

Also, if you don't have any catalytic converters to babysit, you'll probably want to remove the O2 sensor input from the ECU. I soldered the needed pieces on mine so that I can reconnect it easily if I want, but the ECU will ignore the AFM and go into closed loop mode on the highway with the O2 input. This means all your nice tuning is being ignored at cruise. This isn't a big deal if you're just tweaking to compensate for larger secondary injectors or such, but if you're on a quest for fuel economy (like me), this isn't the best way to do it.

Regarding how much fuel you can pull out, you probably don't want to pull out a huge amount at full throttle (though it's very difficult to ping a NA), but down low you can pull out a surprising amount of fuel before hitting lean stumble. I'll have more info later after I've had a highway trip or two to get things tweaked, but as of right now I get a lean stumble somewhere around -40% at 3000 RPM cruise (5th gear, 75mph or so).

-=Russ=-

How hard is it to pop a NA with the safc? Since its NA dont you have more a leway in adjusting? Also how much will it help with emissions I was thinkin about gettin on for my NA to pass smog easier.

hopupracing.com has them pretty cheap(250)??? i think

From what I've read & played with, it's darn near impossible to detonate a NA, and even if you do, it doesn't have enough power to pop things.

... as always, if you fry your engine, it's not my fault.

From what I've been able to tell, the NAs just make progressively less power as they lean out until you start misfiring from too lean of a mixture.

-=Russ=-