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I have some limited experience with stand alone units . The factory changes spark advance a lot in most cars some goes to 40 deg at low speed/ part throttle vacuums .
On after market though on many units if you try to do same things you can run into transit knock advance issues , its like the stand alone is not as fast ECU or not enough break points . Either way many don't go high on part throttle advance so transition to load is smoother. another way to think of it is pre ECU control , think of the vacuum advance unit on distributor and running with it off , thats another way to look at it .
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