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Originally Posted by silver343124
But we are talking about turbocharged engine. If engine is turbo/super charged then the temperature under compression will cause detonation, so ECU has to provide more fuel (than stoichiometric is) into cylinder under full throttle to lover this temp.
And because you can't know how efficient the IC is to determine the extra fuel needed the best way is to measure the intake temp after IC.
You also need a pressure sensor to control the solenoid bypass valve on the turbo side.
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Since Bob has already called you on the MAF vs MAP sensors.
If the ECU knows what the airflow is, it doesn't need to know what the intake temps are. It has knock sensors to sense detonation and retard timing accordingly.
There are many reasons for fuel enrichment at full throttle, lowering exhaust temps is only one of them.
Many vehicles don't have an ECU capable of varying boost. Hence don't care what intake pressure is.