[Alan Roehrich]

In general, spragless converters have more slippage due to how a spragless converter functions.

For the vast majority of cars, a premium sprag is bullet proof, you have to do dumb things to hurt it, or you have to have a nasty engine failure. Even then, replacing the sprag is not terribly expensive.

I don't think there's an advantage to a spragless converter in a class car if you are trying to go fast. If you don't care about going fast, if you use a spragless converter, you'll never break the sprag.

A class car needs the most amount of torque multiplication possible from a torque converter (allows you to run less rear gear and less low gear, for less RPM drop, and lower finish line RPM), with the correct flash stall speed for the engine's power band, and the least slippage on the top end. Not typical characteristics of spragless converters.