Just wondering eg.. Does say a shift point at 6500 rpm drops to 4000 rpm but your stall is 5000 rpm does it drop the stall 5000 rpm or 4000 rpm or somewhere inbetween ?
I have an 8 in converter that stalls at 5,200 in my drag car. I'll shift at 6,500 and by the math it should drop back to 3,800 from 1st to 2nd shift. But in reality it only drops back to 5,000 or so. 2nd to 3rd shift should drop back to about 4,400, but also only goes back to 5,000.
It sounded kind of weird the first time I used it, because you no longer hear the engine climbing up through the RPM. It simply goes to a high RPM and stays there the whole pass down the track, kind of like a jet engine would even though the transmission is shifting. I think this is a bit hard on the converter and puts a lot of heat into the transmission but keeps the engine higher in its power curve.
FYI I have tried a lot of different shift points from 6,000 to 7,000 and it doesn't change where the RPM drops to after the change. And since my big block has a HP peak at 6,300 it doesn't pay to rev much past that.
I have heard the better/faster racers are now using lockup torque converters to help with this slippage problem. I don't know how those behave during the upshift.