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Message: <blockquote data-quote="Rednaxs60" data-source="post: 227050" data-attributes="member: 4617">I finally got the ignition timing and fuel injection for the OEM CFI system figured out.  This was mentioned a while back, and It took a few years to digest.Info on the 8 tooth crank trigger wheel, and 2 cam position sensor with a single tooth cam trigger wheel. From Clymers: This 8 tooth trigger wheel sends out 8 pulses per revolution. The ECU then triggers the fuel injector at the 4th pulse after a TDC pulse is received from the camshaft angle sensors. This information is used to control the ignition timing and fuel injection volume accurately. Good explanation of the correlation between the crank and cam sensors, and is a feel good indication that the 8/1 trigger wheel setup will work with the Megasquirt unit. The Megasquirt unit apparently only requires one cam shaft trigger, not the dual OEM setup.Just read this passage again after the hiatus, and the drawing I made now makes sense.  This information indicates that the standard timing advance is 15 degrees BTDC.  Everything happens in 15 degree increments.  This drawing demonstrates this:[ATTACH]48946[/ATTACH]</blockquote>