Quote:
Originally Posted by ksa8907
Regarding the air/fuel ratio, nothing would happen. The o2 sensors would allow the ECU to compensate.
The larger diameter would slow down the air flow and could cause a loss in power.
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I agree. The MAF sensor is calibrated for a certain size intake diameter. If you change the diameter (to much) you will change the velocity of the air. The O2 sensors should keep the A/F ratio correct but it would do it by pulling fuel back because there’s more air than the MAF told the ECM.
I buddy just experienced this is an engine swap in a Jeep where he upsized from 3” to 4” with the stock MAF sensor.