First off:
I have I/H/E and an uninstalled V-AFC.

I have seen that many people just buy Fuel Pressure Regulators for tuning and choose not to get V-AFC's.

What I don't understand is...how can a FPR be all that useful in a mildly modified car when all you can do is increase or decrease the fuel pressure only one amount from idle to fuel-cut. How can this be an accurate tuning device? Wouldn't different points in the RPM band need their own unique fuel settings? With a V-AFC you can change the fuel settings at any points it would ever be needed.

Is the V-AFC still the best tuning device in terms of air/fuel even if you do not need to change your VTEC crossover (stock cams)?

 

the FPR and V-AFC are two diffrent things, each controling another aspect of fuel delivery. the FPR messes with the pressure(we usually lean this out a bit), and the V-AFC changes the fuel curve. With modifying both the pressure, and amount of fuel given(fuel curve) we can acomplish a well tuned engine.