In a car, true stall is the maximum engine rpm attained with the transmission in gear, the brakes locked, and the throttle opened to the highest rpm possible. But achieving this ultimate stall speed in the vehicle is often difficult because frequently the brakes are not able to hold the power transmitted through First gear and the axle ratio to the drive wheels. Transmissions equipped with a transbrake can reach a converterÂ’s true stall because of the ability to lock the transmission up internally by engaging two gears simultaneously.
Flash stall is the maximum amount of stall the engine obtains from a full-throttle launch at a complete stop with no brakes applied and is higher in rpm than the stall speed created with the brakes applied.