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Old 11-26-2012, 06:50 AM   #311
roger 04 rt
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Joined: Nov 2011
Location: Massachusetts
Oddometer: 2,362
Hi John,
Your spark table only makes sense if you relable the axis. It is upside down otherwise. As I mentioned two posts back, low throttle angle (which is high manifold vacuum) has higher advance than high throttle angle (which is low vacuum).

Once you make that change, the data looks close to most spark advance tables and matches the measurements I've made. The corrected table is below and assumes that the numbers are correct, just in the wrong order.

Perhaps inside the Motronic the axis is pressure, not throttle angle. That would explain your software's misinterpretation of it. I hope this helps you with your work.


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