Im sorry but shouldnt the frequency be lower since the air has a larger throttle plate to flow by?
The MAF reads what hits it, not the total of whats in there.
For a given volume of air moving, the larger diameter of TB, the less dense it has to be to maintain that speed.
The lb/m readings should be the same, but thats calculated based on the tables the PCM has and the MAF frequency.
The MAF frequency is the output of the MAF, it hasn't been converted to a meaningful unit until it hits the PCM and you get that lb/m figure.
By that logic, i'd say its a good thing its lower. but the IDC is not good.... The MAF tables from what i understand control fueling so you might want to check your fueling at your new lower peak MAF Hz.
This is where a wideband is helpful.
