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Exhaust gas temperature gauge
An exhaust gas temperature gauge (EGT gauge) is a meter used to monitor the exhaust gas temperature of an internal combustion engine in conjunction with a thermocouple-type pyrometer. EGT gauges are found in certain cars and aeroplanes. By monitoring EGT, the driver or pilot can get an idea of the vehicle's air-fuel ratio.
At a stoichiometric air-fuel ratio, the exhaust gas temperature is different from that in a lean or rich air-fuel ratio. At rich air-fuel ratio, the exhaust gas temperature either increases or decreases depending on the fuel. High temperatures (typically above ) can be an indicator of dangerous conditions that can lead to catastrophic engine failure.
==Applications==
EGT meters are used for tuning turbo-equipped cars. If the sensor is installed at the manifold collector before the turbo, the turbine inlet temperature can be monitored. If the sensor is installed after the turbo, the exhaust temperature can be monitored. Because EGT typically drops across the turbine, installers try to put the thermocouple as close to the cylinder head as possible to give a true reading, and a reading that will react faster to the engine's condition compared to an installation after the turbo.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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