Why is Engine RPM not directly proportional to Vehicle Speed, even when gears are not changed?
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If you have an automatic gearbox it probably has a torque converter, basically an impeller pushing fluid, driven by the engine, and then a turbine being pushed by that fluid, driving the wheels. It’s a little less efficient but it means the engine and transmission speeds don’t have to be perfectly synchronized, which allows for much smoother shifting than you could otherwise have.
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