Quote:
Originally Posted by cRiPpLe_rOoStEr
Nowadays I'd rather try to work on the valve overlap in an engine fitted with VVT instead of dealing with an external EGR.
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VVT works well at light load conditions. At higher loads, you need the ability to cool the EGR and there is no way to do that except with an external EGR loop. The Prius has done this for the last 2 generations and it is becoming more common. It is particularly helpful for part-load knock mitigation with boosted engines or engines running Miller Cycle.