Quote:
Originally Posted by Freon
I don't think the N54 or N55 engines have actual an actual "EGR" system, and I doubt backflow of combusted material into the intake ports. I think PCV is more than sufficient to describe what is going on.
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It doesn't use a traditional EGR valve style system. It uses VANOS phasing to increase reversion in the intake during overlap to recycle some of the exhaust gasses. PCV is a contributing factor but not the major factor.
Cobb tuning has actually reworked some of the VANOS tables with reducing this effect in mind.