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Old 08-29-2018, 02:30 PM   #753
neg_matnik
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Member#: 132389
Join Date: Nov 2006
Chapter/Region: BAIC
Location: SF Bay Area
Vehicle:
2006 WRX Wagon SGM
2003 SV1000S, 2014 DL650

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Quote:
Originally Posted by dwf137 View Post
Pretty sure it's emissions based. The port injection threw off something with the US based emissions testing. Wish it had port injection, I'd love to not have to clean carbon out of the valvetrain.
I've read that using port fuel injection helps lower particulate matter emission levels from the direct injection combustion process.
Maybe, for the moment, EPA/CARB particulate matter emission limits for gasoline engines are still low enough and VW figured they would cut cost by not providing port fuel injection to USDM car.
Or maybe it's as you said; port fuel injection screws some other EPA/CARB emission level limits.
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