Have you found a good area to set vtec at with the sc? ...and maybe with a tp?

What should tge target afr be ?
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In my experience NA and SC the best transition area where the car made power is between 3500-4k rpm, a TP is crucial in making this work. If your still running a cat you wont be able to make any power in vtec bellow about 5500rpm.

With the SC I always tapered my afr to run leaner at a lower rpm where there is minimal boost/strain and where the added trq and responsiveness of the leaner afr is appreciated most. So generally Id run 12.8-13 range up to about 4000-4.5k rpm and start introducing more fuel progressively till I hit 11.8-12 at redline. It should be noted, the leaner the afr the higher the combustion temps will be, and the richer the fuel ratio the cooler, but an extreme on either end can cause bad problems so there is a safe range and you can choose to run on the richer or leaner side of that range depending on some general factors. Generally 12 afr on the nose is a good safe and efficient afr target to aim for in any set up that is timed properly and AIT are in a reasonable range. But if you want to maximize the efficiency and safety, again leaner can be had in the lower rpm and richer is safer for the top end where the engine is producing more heat. The factory s2k fuel map is actually tailored this way, this is most evident in the earlier ap1 years.

General afr theory states that max trq is made at 13.2:1 ratio and max HP at 12.5:1.

 

So with an OBD scanner you can get Fuel Trim Bank sensor readouts, theoretically could one use this data to fine tune a VAFC?
Or is that data not valid at WOT? Trying to understand.

 

dont think the fuel trims are used at WOT

 

Yep narrow band only, I checked.