Make a sweep thru the nhra stock, super stock, and comp records for stick cars, let me know how they stack up against the 1320/mph=et efficiency formula. You will find that they have around the same reletive efficiency as the Coyote Stock guys. Some come in a little under the formula, some come in a little above, my point is that even the trick clutches and clutchless transmissions that are used in Super Stock are no more efficient at converting mph to et than the single disc diaphragm and clutch assist setup the Coyote Stock guys use.

Pro Stock pretty much has to use centrifugal assist, pretty tough to get enough clamp without it.