With thes kinds of mod:
Intercooler
conial filter
full catback
downpipe
is a SAFC enough to tune the A/F ratio???

or a aftermarker ECU is a must???

 

Hi

I have an intake, downpipe, midpipe and catback. with It I use a S afc + Avc r and all is good!
An ecu is best but more expensive

 

if you can keep the boost under control, a super afc is fine, heck the stock ecu is fine

 

I have the same things you do, except I have a hi-flow cat instead of an intercooler (soon to change) and my s-afc is more than enough. Before when I had the stock cat, I dyno'd in at 9.0 fuel-air ratio from 3500-7000 rpm (i also had the k&n replacement instead of my blitz sus filter). At that point it's actually too rich, which explains why I only had 234.9 hp & 229.4 lb/ft
Every car's diff though

 

are you guys running the new S-AFC(silver) or the old style(black with turn *****)?

 

im running the new one, blue display

 

aight... well, I'm running the old skool one and it's kinda hard for me to tune anything when I think my O2 sensors are screwy now.. air/fuel gauge stayed at lean..... how many O2 sensors does a Fd has anyways?

 

for god sakes, dont use the stock O2 sensor to tune!!!

How many freaken times do i gotta repeat this?

Get on a dyno with a wideband/lambda or buy one from motec.