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All you need to find out is a stopwatch, preferrably with a friend operating it. Time from a rolling start (to eliminate any launch variations) , to a predetermined speed, say 15-85 MPH, that will give 2 shifts, ending in 3rd without going to redline.
Generally speaking, you want the largest area under the H.P. curve. To do this you want the H.P before and after the shift to be roughly equal. With every HP curve/gearing combination I've seen, that means shifting past peak HP by 500 RPM or so.
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