Join Date: Apr 2011
Location: Orange County, CA
2011 Sonata SE 2.0T
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I've just gotten used to wiping my tailpipe tips down every few days. Turbos typically run rich as a safety precaution at WOT to prevent detonation. Also, rather than a conventional EGR system, Hyundai basically performs the same function through exhaust cam phasing, which keeps the exhaust valves open for a little on the downstroke, sucking back in a little exhaust.
My father-in-law-who is a mechanic says he sees a lot of cars come in with very sooty EGR systems that need cleaning out. I'm thinking our sooty tailpipes is just what would otherwise be going into the EGR system.
Besides, I've heard some real horror stories about early VW and Audi direct-injection engines that got major carbon buildup on the intake valves, so if slightly sooty tailpipes is the tradeoff, that's fine with me.