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I just concluded that I can't use the 2.625 pulley because the belt was slipping even with a DSX idler bracket and I based that solely on lower absolute manifold pressure than that of my 2.75 pulley, not my any huge fluctuation in the MAP PID like yours. On the other hand, although mine has minor fluctuations in map, the RPM curve looks like corduroy. It's just a long series of up and down movements in RPMs all the way to the shift point, not good
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2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO.
15" conversion, MT ET Street R 325/15.
100 octane: 1045hp/1055tq.
100 octane + Meth (1x10+): 1117 hp/1067 tq
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