S-AFC Tuners!
 

I got a slightly modded TII and I'm thinking about some fuel system upgrade. I already have a F-CON, but doesn't feel like it's doing the job. Anyways, here are my mods:

89 Turbo II with 28k on rebuilt
115psi in both rotors
HKS Power Flow Intake
HKS 60mm Sports Cat-back system
HKS PFC F-CON with FCD
Custom 2.5" Downpipe(might be a brand name)
HKS Boost Gauge( 30mmHg/30PSI)
HKS EGT 1200F-2200F
APEX'i AVC-R set at 0.65ATM(arount 9.5 psi)

I'm split in between getting a GCC for the F-CON, or selling the F-CON and getting the S-AFC. What should I do? Also Anyone know how big of a injector you could use with the S-AFC? What are the downside of getting a S-AFC? upside? Someone please help. Thanks

jay Kim

Your Upgrades are like mine except I have the TO4E, but to answer your question. The S-AFC is a great price affective product, I'm running 720cc injectors at the secondary and the S-AFC allows me to dial those baby's in pretty good. You don't need it with the F-Con it's one or the other, F-Con is expensive with no controlling it ,you have to hope that it's doing it's job. I notice that my A/F monitor react's when I dial in number's on the S-AFC. I really enjoy that, because on chilly nights you can face detonation if you don't have the appropriate fuel going in and I don't want to leave it to F-CON to decide. Sorry about that money you spent on F-CON:(

S-AFC is great. as far as the injectors goes, you don't want to get more than 720's with your mods. Im waiting until I put on the T04 to get the 720 injectors. The S-AFC works to +or- percentage of fuel. So if you have too big of injectors I don't think that you could compensate for the fuel. plus you have to get a different fuel rail when you get too big. 720 will work fine. Hope I was some help.

Another thing...
 

Also I heard that the S-AFC controls fuel by modifying the MAF sensor signal going to the ECU. Does that mean I could do away with the MAF and the shitty turbo inlet duct, then put a new pipe in?

Jay Kim

Just as an FYI, the F-CON only works correctly with the stock injectors that it is programmed for. That means for the FC's it will only work with 550cc's unless you run the S-AFC. Then you can run the larger injectors, and tune them in with the AFC. It even has directions in the instructions on how to wire it up with the F-CON. It is a much better combo to use than just the AFC alone, as the F-CON can adjust fuel according to boost, not just RPM's.

Re: Another thing...
 

Nope, the only way to get rid of the AFM is to go aftermarket ECU. The AFC modifies the MAF signal. It does not replace it :( You can make a custom TID pipe though if you are still using the stock one.

Or you can be like me and tie the s-afc into the boost sensor rather then the TPS.. (88 10ae) .. cures the problem with the narrow range series 4 TPS and gives me boost/rpm fuel correction..

That sounds like a much safer setup over just rpm fuel correction. Can you explain how to do it?