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I'm using an EDIS-4 system for ignition. A robust system that provides for a limp-home mode if the ECU decides that it is tired someday. It uses a 36-1 gear, so each tooth represents 10 degrees. Today, I began the process of verifying that the spark happens when I want it to happen.
I used the "spot the apex seals through the spark plug holes, then split the difference" method to mark a rough approximation of TDC. I put a silver line on the timing tooth gear, following the line of the stock pointer. The mark just happened to fall in the space vacated by the missing tooth. As the engine rotates, it moves to the left.
I connected a timing light, and spotted the marks show while cranking the engine. This isn't a picture from the timing light strobe. I positioned it manually and took the picture with my phone. When cranking, the pointer split the difference between the line and the first dot almost perfectly. If I have this straight, the spark is lighting about 5* before the rotor flattens out against the spark plugs, which is top dead center, is translated as 5* BTDC. My goal was to move the VR pickup to where I would get 25* of timing advance that Lynn recommends without any input from the ECU.
Question: Is it worth the effort of moving the mount to get 25* of advance vs 5*?
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