It’s not until the converter is basically locked up that the power curve will mimic the engine power curve...
i was thinking the same thing when i asked zippy what stall converter he has, if you look at his graph, it's about 5000rpm where the curve starts to look like what you see from an engine dyno.
Exactly. If you notice, there is a little upturn in the curve right about where he says the stall speed is. It isn’t necessarily that there is a spike in engine power output at that point, but rather a spike in the acceleration rate of the drum, because of the spike in converter efficiency.
It would be interesting to see a rpm/time graph of one of those runs. If the button were pushed right before going to wot, that area from about 3200-4800 probably happens in less than one second.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
