The reason a stall converter works is simple an engine at 1,200 RPM is only making about 80 or so horsepower (on average), but at 2,500 RPM it could be making 150 to 200 HP, and obviously trying to get a car moving using 150-200 HP is going to be much easier than one trying to launch at 80 HP or so. Stock cars have anywhere from 1,000 to 1,400 RPM stalls from the factory. It isn't an exact science as far as an exact stall RPM goes. It's all relative to torque, vehicle weight, traction and rear gearing. Keep in mind, if you put that same converter behind a nasty big block, in a car that has serious traction or is quite heavy, the torque of the engine will drive the stall speed up to a higher RPM, and an engine with less power will have the opposite effect and won't be able to stall the converter out as high. If the converter was a 3,500 RPM stall, then it would be at approximately 3,500 RPM in which it forces the tires to break loose. With that, if you take a car with a 2,500 RPM stall converter and you hold your foot on the brake hard, and hit the gas at the same time, (as if you were going to power brake), the "general" RPM in which the tires will break loose is at "about" 2,500 RPM. Basically "stall" means when the torque converter "locks-up" under a load. I'll try to keep it short because it's an involved subject.
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