Originally Posted by
jakermac
That's not the only reason for needing a tune. The sensor wire reads the air moving past and calculates a voltage based on the airflow at the sensor wire and the DIAMETER of the tube that the sensors resides in. Therefore, the wire sees x flow and based on a 3" tube tells the DME a voltage which represents how much air is coming in. If you change the diameter of the tube to 3.5" without telling the DME, suddenly the signal going to the DME is no longer correct. One of the changes in the tune when accounting for the larger MAF is telling the DME that the voltages coming from the MAF represent a different amount of air entering the engine.
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