Quote:
Originally Posted by wrxkidid
Lower intake temps means denser air which means lean condition which is bad.
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This not true in any way whatsoever at all. The factory intake is a "cold air intake" after all. The MAF (mass airflow) sensor measures the *mass* of the airflow so it pretty immune to temperature changes. Also there is a temp sensor with it anyway. The usual reason that *some* intakes run lean is because of the tube diameter the MAF sensor is installed in (and sometimes the location of the sensor in the tube also and sometimes turbulence issues too). If the tube ID is bigger than 65mm then the calibration of the intake changes and this causes some lean out (likewise smaller than 65mm causes a richening). Sometimes this lean-out is done on purpose by manufacturers because it increases power on stock relatively-rich tuning. This is prolly the case with the Injen CAI which leans out a WRX/STI by about 1% A/F ratio and that's quite a bit.