will the S-AFC help me ?
 

my set that i plan to be running with in the very near future is a gt28r, racing beat exhaust, meth inj, stock tmic, about 16-18 psi. would i be able to tune what needs to be with the S-AFC ?

better plan is an Rtech, a good tuner, and a dyno...

Get a real standalone. That setup with an SAFC is a disaster waiting to happen.

for the price of a new S-afc II and harness and install, you could probably find a used Rtek 2.0 or 2.1 and then be able to tune much more than just RPM based fuel correction. the S-afc is only a rough tune and just tells the computer how much fuel to add (extra) at a certain RPM, regardless of load or boost level. you could be full throttle at 2000 RPM and still be running hella lean......cuz the S-afc doesnt only adds extra gas per given RPM set point. dont bother with it.

the Rtek is much closer to a standalone, wherein you can adjust injector pulsewidth, setup datalogging, adjust timing, lots of cool stuff. research it.