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automatic, attached to your flexplate, and your tranny input shaft inserts into the converter. Depending on size (9inch, 9.5, 12, etc.) and the amount of lower end torque produced by the motor, the converter stalls are different RPMS, such as 2400, 2800, 3200, 3600 *as with mine*, and so forth. Converters give automatics a cutting edge in drag racing for achieving lower ets, by allowing cars to stall to higher rpms, placing the engine in the higher power band instantly or quicker. Converters thus drop sixty foot times greatly. Theres much more to converters then what i've stated, such as lock-up features, Nitrious anti-balloning plates, etc., but i hope this gives you a basic overview
Like the Dude says, the terminology "stall converter" is incorrect. The actual item is called a "torque converter". A torque converter is essentially two fan blades pointed at eachother, the engine turns one, which forces fluid against the other one, which causes it to turn and therefore rotate the input shaft of the transmission. There is a "stall speed" which the converter is generally rated at, which is approximately what speed the converter generates sufficient force to overcome whatever resistance is behind the transmission, whether the car's brakes are on, trans brake, or just the required accelleration forces of the car. There are various kind of stall speeds which are measured differently (with brake on, by "flashing" the converter with no brake merely a pedal press). Stall and depends not only on the converter, but the torque of the motor as well. You can idle in gear because the idle speed is lower than the stall speed of the converter, so the converter slips, the brakes hold the receiving impeller of the converter still, and the power the engine is generating is turned into heat. There are some good articles on the web which explain converters better (and more accurately):
From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Stall Converter....??? (Oh My)
automatic, attached to your flexplate, and your tranny input shaft inserts into the converter. Depending on size (9inch, 9.5, 12, etc.) and the amount of lower end torque produced by the motor, the converter stalls are different RPMS, such as 2400, 2800, 3200, 3600 *as with mine*, and so forth. Converters give automatics a cutting edge in drag racing for achieving lower ets, by allowing cars to stall to higher rpms, placing the engine in the higher power band instantly or quicker. Converters thus drop sixty foot times greatly. Theres much more to converters then what i've stated, such as lock-up features, Nitrious anti-balloning plates, etc., but i hope this gives you a basic overview