great info, with the newer ECM units where you have complete control over timing info like this is great...with the mega squirt we run on our drag radial car we can taylor the timing wherever we want...

Very good thread and if you follow it closely it become's apparent how important tolerances aka valve train seating and cam profiles play such a big role and why efi is still only a bandage so to speak,,,,,Precise metering and timing of course but only if the tolerance level's are just as precise.... the valve seating so precise and the duration timings are are so precise ......and then there is the induction process..so little time so many variable's.