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It looks like to me that from 3.1K rpms to 4.3K rpms the S362 tune was running WAY leaner than the sc61 tune. I was going to say that even the S362 beat the scm61 in spool time, but I don't get that a/f graph. Did the sc61 need som sort of supper rich ration on spoolup to avoid knock? Was the timing advance too high for the SC61 between those points? If so, Then retarding the timing would allowe a leaner a/f ratio to assist in spool AND would assist in spool in itself.
Otherwise, that's a great set of runs there.
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Matt
dd '90 GST, Holset H1C
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