don ,i think your not understanding me.we both know the circuits function.the grooves in the stator bushing will get the oil out of the converter faster in your application.no one here is arguing that the converter charge entrance needs to be smaller to reduce excessive charge pressure and the resultant elevated trans cooler pressure derived from it.as a matter of fact i would argue that if the converter feed hole is a given diameter that the amount of oil exiting isnt really a problem if the exit at the input shaft nose is the same diameter after pressures have been reduced by orificing,and enhanced with a grooved bushing if the converter isnt bushed.this restrictive condition at the input shaft woul actually reduce cooler pressure but raise internal pressure in the converter if we believe everything elkse presented.
I see your point Chris. With the orifice size I've been using, that problem has not come up. The area of the holes in the input shaft responsible for allowing fluid to exit the T/C are pretty large when compared to the feed orifice of 7/64". The more important thing to consider would be that the internal components in the torque converter don't present any flow restriction to any of the exit holes in the input shaft. Of course, grooving the front stator support bushing would be good insurance, but would still not make up for any blockage to flow by the internal components of the T/C.