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What is Stall Speed, refering to a torque converter?
This is the most basic way for me to tell you under light loads, a vehicle with an automatic transmission will start moving as soon as you take your foot off the brake. The stall speed comes into play under all load conditions. When we talk about stall speed, we're referring to engine RPM. If the vehicle isn't moving by the time the impeller reaches the stall speed, either it will start to move, or the engine RPM will no longer increase. In other words, stall speed is the engine RPM at which the torque converter transfers the power of the engine to the transmission.
the torque converter's stall speed roughly equates to the clutch engagement point on a manual transmission. Let's say you're driving your stick-shift car around town. Normally, you'd give the car a little gas and ease off the clutch pedal gently enough to get a smooth start. Likewise, under most driving conditions the torque converter will start delivering power to the transmission at relatively low engine RPM.
say you need lots of power, either to make a fast getaway or to start with a heavy load. You'd rev the engine up to a point where it delivers more power before letting up on the clutch pedal. It's under those same circumstances that the stall speed becomes important. The torque converter will allow the engine to build RPM without turning the output shaft (the turbine) until the stall speed is reached.
What many people don't know is that the torque converter is a tunable device. Stall speed is determined by several factors, including the distance between the impeller and the turbine and the design of the stator. By properly modifying the converter's internal components, it's possible to alter the stall speed and create a torque converter that is tuned for a particular engine.
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