Flushed the system yesterday and refilled with straight water and burped. Ran much cooler than before.
Today was the big advancement. Notice there was only 3-6 degrees of timing at 60mph. Copy and pasted borderline knock table to maximum allowed spark table. Not only did it run cooler but my chug at the 45-65 went away. I happen to catch this when it ran sooo much smoother at 80 on the highway and not so much at the "slower speeds". Back to cruising at 60mph and in the 190s.
May not be the total cure but there is a significant change in operating temps in that range.
Today was the big advancement. Notice there was only 3-6 degrees of timing at 60mph. Copy and pasted borderline knock table to maximum allowed spark table. Not only did it run cooler but my chug at the 45-65 went away. I happen to catch this when it ran sooo much smoother at 80 on the highway and not so much at the "slower speeds". Back to cruising at 60mph and in the 190s.
May not be the total cure but there is a significant change in operating temps in that range.