Programming MSD - when should timing be all in?

The MAP sensor for advance addition will aid much in drivability, economy and temperature management. RPM only is good for WOT(wide open throttle). At low MAP (high vacuum) more advance is good. Too little advance at cruise, heats the heads and exhaust, and engine compartment leading to unsolvable heat problems. Good running N/A engines burn the fuel in the combustion chamber where it does good.

Using MAP, RPM table lets you go well beyond a mechanical distributor. The OEM mechanical advance and vacuum daspot have tuning limitations because they are independent of each other. A 3D table solves timing control issues, in coast down, and throttle lift at high RPM. It is also possible to tune in rev limit, by retard, keeping ignition active to burn fuel in carb system.