I am very aware of the air temp sensor in the MAF! You are correct, it is required for the MAF to properly function.
What I am talking about is how the MAF sensor in a pull-through configuration such as the R35 GT-R will not be aware of changes in air temp caused by the compressor and intercoolers. Therefore the ECU will not make air temp corrections (for fuel injection) based on air in the correct location.
To accurately apply air temp corrections for the fuel tables would require a secondary air temp sensor in or around the plenum, after the intercooler and compressors.
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