Quote:
Originally Posted by DJCarbine
I would have thought that the maf would "see" more air depending on the density of the charge air so that it would see more air as boost is turned up.... I've only tuned SD so my grasp on MAF tuning is limited.
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You are correct. Hence the term
mass airflow meter. It does indeed read airflow mass in pressurized conditions. But one issue I've seen in blow-thru MAF applications is oil contamination from oil blow by from turbos. This is why every MAF referenced OEM turbocharged car I can think of (GT-R, Porsche Turbo, etc,.) uses draw-thru MAFs. It's also no surprised that they use bypass valves that recirculate discharged air back into their induction system (downstream of the MAF). Turns out what works for MAF accuracy also works for emissions and noise regulations. Of course, it's important to have a leak-free induction system in MAF referenced systems. But I think this is reasonably easy to ensure with quality clamps and couplers.