BlackRx7

are these worth a crap? I'm about to buy one for $100 and wanna make sure there isn't any recalls or faults with this unit. is this worth installing, seeing as I only have an FD fuel pump and stock injectors, can you still see performace gains if your fuel system is basically stock?

VetteKiller

an S-AFC doesn't really increase power, it better "controls" what power you have to work and helps you get the most performance out of your mods with out blowing your engine

DCmina

what are the differences between the 1st gen and 2nd gen s-afc?

Maxthe7man

The maind difference is of course the lack of a LCD display, the newer safc also gives you a high lo throttle setting, the old s-afc actually gives you the new airflow setting reguardless of throttle position or engine load..
And in truth the knobbed model is actually the 2nd afc, the first one was the afc which richend the whole rpm range with one ****, not very good for tuning, if you needed more fuel up top, you got more fuel everywhere.. the multi knobbed one is pretty good, but would be far better on a n/a car than a turbo car, you really don't need the richness off boost.. you can really screw your mileage trying to up the fuel curve sometimes..
I ran the knobbed s-afc with a walbro pump with stock injectors and had no problems with 10-11 psi of boost on a s-4 tII, this is at 3800 ft, your results or engine life may vary with lower altituders..
The nice thing about the new safc though is the injector and airflow readings, plus being able track your o2 voltage.. but if there was a knobbed s-afc going for a 100 bucks US, I would definetly pick it up, or buy the greddy e-manage before the new -safc for the cash...Max

VetteKiller

Max, your avatar is awesome

BlackRx7

yes his avatar is bad ***, but would an s-afc be able to give my car more bottom end power, if I either leaned or richend the system please give me so feedback on how I would set the s-afc for daily driving and then for drag or autoxings, any inputs greatly appriacated

Maxthe7man

...Glad you guys like the avatar, a bunch of us Canadian guys are Gregg the bunny fans, search some of the posts in the Canadian forum RX7_Turbo2 has Tardy the turtle..
As for your car, it completly depends on the individual car, its mods, and its enviroment, I actually had my TII leaned out in the lower RPMS to make it more crisp, it was soggy around 1000-2500 or so, to rich .. but in the mid range I added about 15% correction to rich as it seemed to lean out there as the boost came on, you really need a good air/fuel guage and a good co pilot to watch while you get into boost to see what you need, and really I actually prefer a digital voltmeter to an a/f guage..
With the N/A's they are horribley rich from about 2000-4500, they could be leaned out bigtime and gain some power..
When you are playing with air fuel ratios, its best to make small changes and only one or two changes at a time so you can see the results of it immediatly and safely..Max

autocrash

Uhmm.. I think the point of this question was whether the 1st gen is gonna be more difficult to use and tune reliably when compared to a 2nd gen....


...atleast, thats what I want to know...

Maxthe7man

See my first post for my opinions on that..Max

BlackRx7

okay that sounds good, my mods are in my sig,
I have a Phantom autometer a/f gauge, is there anywhere where I could get some s-afc adjustment instrutions, I mean what the best setting for my mods?

Maxthe7man

There are no specific settings for your mods, its up to you to determine what the settings are, an s-afc is only a tool, and like any other tool, its only as good as the person using it, its like you buying a paint brush and then asking me what your painting should look like..
S-afc settings will vary from car to car greatly, ChrisNG who is on the forum here, ran basicaly the same setup as me, but he had more fuel enrichment down low than I had, and my car always ran richer than his at high boost levels, even though with everything else almost the same..
All I can give you for advice is keep it on the rich side with a turbo,and a standard o2 sensor is not a very good tuning tool for that, a 3 or 4 wire is much more accurate than a single wire one...
I am also leary about autometer a/f guages, I know mine was not near as accurate as it should have been, one bar of rich was actually stoichiometric by the lambda voltages..Max