Non-EFI timing curves use RPM and maybe some vacuum advance is added at low load conditions. That's about it. And the typical MSD curve is a simple spring determined ramp, from the initial value at idle, to the total timing at some RPM.

A well designed timing "curve" looks at RPM and engine LOAD and uses as much advance that the engine wants at any given point. The result is the best engine efficiency even at part load conditions where we spend most of our time. Torque goes up while fuel usage goes down.

Good luck with your project.


The problem is that it takes a while to do this under static conditions and the tuner must be up to the task. But once done, the results are quite impressive.