FN1204 = Start of Injection Delay. The one that looks like it has a valley running through the middle of it. FN1104 is a similarly shaped fuel pulsewidth multiplier table.

As for Ford's reasoning behind the maps, I don't have a reasonable explanation. You do have to consider that their tuning equipment and software was much less advanced than what we have today. When you consider where we are at with tuning nowadays compared to 6 years ago when 7.3L production was halted, the jumpiness of the mapping makes a little more sense, or is at least excusable due to limited development tools. Also, I'm not sure if they were doing steady-state tuning, loaded tuning, or what, but I'm fairly sure that they would plot along certain points in the maps and the fill in the blanks. That's my guess anyway...

Yay! My Mother-in-Law is here so I got to work on the truck today. Got all the O-rings and seals on the oil cooler replaced plus oil change and cooling system flush done...
Now back on topic, I have reread the posts in this thread a few times and it actually starting to make sense:skeptic: Think I am gonna make a flowchart of how the various parameters interact with each other... Will post it once its done...

to do a decel tune, which parameter(s) get the EBPV to close for engine braking? I have the torque converter lockup points done..