Is there such a thing as a 5000 stall converter that is streetable ?

To keep the power band continuous ?

The converter housing, hooked to the motor, and the impeller, hooked to the trans, spin at different speeds and use fluid flow between the two to transfer energy/motion from the housing (propeller) to the impeller.
Picture a fan blowing on another fan and making the second fan move; this is basically what a torque converter does. Because they're spinning at different speeds, the output torque is different (converted) from the input torque.

If the two are spinning at the same speed, the fluid moving between them isn't transmitting any more energy from one to the other, so there's no conversion of torque. They're not mechanically connected, so no motion transfer happens at all. They're just free wheeling. This is stall.

Stall RPM has to be higher than peak power so that you don't stop transmitting energy from engine to transmission right when the gettin' is good.

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