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I'm tuning a Ford 6.4l. un diesel timing it has main 1 is obvious but main 2 is a different story, config 0to4 prev 1 and 2 the same with the post1 can someone explain what these are? second, there seems to be some misinformation on other forums, and can't seem to find a straight answer on the SOI timing numbers is -6 BTDC or after in hp tuner?
Thank in advance
