Huh. It might just be coincidence, but did you notice that you have torque bumps where your a/f goes to about 12.8, and directly correlated dips where it drops to 12.4,
or goes over 13:1?
I've found that my car (M10, so very different combustion chamber) responds similarly- if I have the testicular fortitude to run it at 13:1, I make best power and I don't
get any appreciable detonation. I use carbs, so I tend to play a little safe.
John and Digger will have more insight, but while my first thought was intake resonance, that a/f correspondence is very direct. Personally, I'd mess with it to see...
t
would also be tuning his own DME.
or goes over 13:1?
I've found that my car (M10, so very different combustion chamber) responds similarly- if I have the testicular fortitude to run it at 13:1, I make best power and I don't
get any appreciable detonation. I use carbs, so I tend to play a little safe.
John and Digger will have more insight, but while my first thought was intake resonance, that a/f correspondence is very direct. Personally, I'd mess with it to see...
t
would also be tuning his own DME.
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