I have a 5.7l with the stock 4x reluctor and was wondering if anyone has any info on how the injection boundary, normal, and makeup tables are calculated. I have seen lots of stuff on the 24x, but the numbers don't make sense when using the 4x.

By definition, the Boundary should be the reference point, and the normal and makeup should be adders.

Mine factory was 6.15 boundary plus 5.5 on both normal and makeup. Does this mean that I'm firing at (6.15+5.5)*90? Where is the 0 mark that the boundary uses to end injection? Is 0 at TDC on compression or inbetween compression and exhaust? I have read countless threads, but no one says anything about the old Vortec motors, only LS.