Jeep Strokers

Am I correct that in closed loop the ECM is controlling the air/fuel ratio just like it did when the engine was stock? This question assumes the injectors have been change to larger injectors. I realize the 19lb. injectors probably would need to be on all the time (100% duty cycle) and still may not deliver enough fuel. I guess what I'm asking is, if there was a way to never be in open loop mode would you need any type of controller besides the ECM of course.

If the piggybacks are adjusting the MAP value, do they offer anything more than convenience over the homemade MAP adjuster? For example, changing values on the laptop as opposed to turning the potentiometer.
It seems like a lot of $$$$ to do basically the same thing?

Picture a grid w/ rpms on vertical axis in 500rpm increments(with the psc1--I wish it was in 250 at least) and map pressure in Hg in .5 or so increments on the horizontal axis. There are basically a couple hundred cells to tweak values for. In closed loop, I'm trying to put values(+/-25.5) that will zero the fuel trims, so the pcm doesn't have to do much work(if you throw 24#ers in, the pcm will be able to manage them in closed loop) and constantly be swinging(esp big ones). In open loop, I'm shooting for 12.5-8 AFR for max power. Take your adj map, wideband o2, and find a nice hill that you can accelerate up to at least highway speeds and adj until you hit that AFR.