Hey DJ Galant,
Cheer up bro. Don't be too upset over it. The S-AFC will work, but it's not as effective or as responsive as a stand alone EMS. I am unfamiliar with GReddy's system because I have no experience with it, but it should be very similiar to all the other EMS/PMS out there.
JR said that because his goal is to basically get a 14.7 a/f all across the board or at least as close as possible. With the S-AFC, your job is going to be very hard. Plus, what he means is that if in the future you are going to be buying a Boost Controller, Turbo Timer, Nos Controller, Ignition Timing Control, A/F Controller, then you might as well buy a stand-alone and have it all plus you get full programming capabilities. It's just more effective, efficient and way more responsive if you're trying to get high horsepower and want your car to run just as good in idle as it would at high boost safely. You just need to have a trained professional to do it, don't give that kind of job to just anybody.
Just like the OBD II problem, the only true way to tune it would be to go with a stand-alone or revert back to OBD 1. Also one reason why you should purchase a 95 under Supra for example because 96 onwards they switched to OBD II. Also, they stopped using the 6-speed tranny...but that's a diff story. Computers get harder to trick and work with as they get quicker and more efficient. Technically, it's a good thing as it keeps you from hurting your motor, but when you are trying to get more HP and do big custom work on it, it's not your best friend. So we just rather junk the stock ECU and run our own.
To sum it up, the S-AFC will work ok but you aren't going to get your car running to it's fullest potential.
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