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Originally Posted by Cloudsurfer
Excellent advice. Unfortunately, there's only so close you can get practically. The fact that these MAFs do have the smoothing grids certainly helps, but I don't doubt that my car would benefit from a custom tune.
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You could do a calibration on a flow bench and be sure it's right, but there's alot of effort involved there and then if you can't get the position quite right, you would still need to tweak the ECU or sensor.
The final tune is the best way to make sure everything is working as expected.