Torque Converter Operation
The torque converter is one of the least understood components in an automatic transmission equipped vehicle. I will attempt to explain what it does and how it does it.
The torque converter has a few different functions.
We first need to understand that there is no direct link between the crankshaft and the transmission input shaft (except in the case of a lock up style converter, but we'll talk about that later). This means that the first function of the converter is to connect the crankshaft and the input shaft so the engine can move the vehicle; this is accomplished through the utilization of a fluidic coupling effect Autel MaxiCOM MK808.
The torque converter also replaces the clutch that is required in a manual transmission; this is how an automatic transmission vehicle can come to a stop while still being in gear without stalling the engine.
The idea behind a higher stall torque converter is to allow the engine to rev more freely up to the point where the powerband begins, and therefore, enable the vehicle to accelerate from a stop under more power Autel MaxiSys MS906TS.
This becomes increasingly important when an engine is modified. Engine modifications such as ported heads, bigger cams, bigger turbos (in some cases), bigger intakes, etc. tend to raise the point where the powerband begins. For best performance, the stall speed needs to be raised accordingly to work optimally in conjunction with the given vehicle alterations.
Factors such as engine torque and the rpm at which it is greatest, differential gear ratio, vehicle weight, camshaft design, compression ratio, type of induction- forced or naturally aspirated, and a host of other variables all need to be taken into consideration. Be aware that the "off the shelf" type performance torque converters sold by some manufacturers are very unlikely to be optimized for all vehicles and their unique requirements.
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