One of the great advantages to computer controlled EFI is it can do so many things. For instance, it cuts fuel in deceleration to keep the engine from chugging in a slow down. You can change at how long it waits before it drops the fuel, what rpm it picks it back up. You have control. You can change what rpm the engine runs when cold, changes in fuel for warm up, changes in timing, changes in acceleration parameters, and on, and on, and on. Does this seem complicated? Not really. The manuals that come with most of these explain what the software does and how it handles each think fairly well. If you pick a base engine to start from you don't have to set all of this but if you find the engine a little rich in acceleration, pull out the laptop and change the number a bit. It really is a lot simpler then pulling a carb and changing the accelerator pump, drilling bleeds, feeds, emulsions, putting it back together and seeing where you are.
With a narrow band closed loop system, cruise and medium throttle will be controlled at 14.7. You pick a point where if you go beyond it goes to open loop. You generally don't want to make full throttle runs at 14.7 and most systems are set up to go open loop for heavy throttle usage so you can make it richer.
With a wide band loop you can control the mixture you want to run at any point. If you want to cruise down the highway at 15.5:1 just set it. If you want it to drop to 12.7 as soon as you get in the throttle, it's there!
I know some of you may be a little gun shy of the computer but the computer allows you to change the EXACT parameter you seek to change...and that is so cool!
My only problem is I had to order a new laptop battery. Otherwise I am going to need a long extension chord for the drive!
Gary