H*LP needed understanding fuel\ignition curve dynamics

[Jim Pearl]

I've got some tough (IMO) questions!

Recently I've gotten the new version of DFI's software and it generates =
fuel curves for you based upon max HP, torque, and the RPMs where they =
occur.

What I'd like to better understand is how torque and fuel relate along =
with ignition. I've noticed that when I input a greater torque figure =
that the "hump" in the curve appears to occur where the torque peaks - =
not where HP occurs. Since this is a turbo application (5.0 Mustang) and =
the software doesn't ask about forced induction I wonder if this =
applications curve is close to being right.

Should max fuel occur at max torque? What about ignition? should max =
spark occur at light cruise? Peak torque? Currently my spark curve is a =
mess with spark peaking about where I cruise. Some of the reading I've =
done lately has made me wonder if this is a good idea - should an =
efficient engine need much spark advance? Currently MPG isn't great but =
it's getting better. I may be able to get my hands on the stock Mustangs =
spark curves - should I emulate those (mostly) until I hit boost?

I know this really isn't enough data for specific tips but what I really =
want to understand better is when I should max spark and fuel. I may be =
able to get hold of a Vericom to get closer to the correct HP and Torque =
figures for the software. Even though the maps aren't perfect they're =
much more linear than what I was using before and the car is running =
much better - if you've got DFI, much recommended upgrade!

Last but not least (sigh) anyone know which pin on the EEC-IV harness is =
for the driver's side O2 signal? I currently can't run closed loop as my =
signal is real flaky and I need to trace it back. TIA!