Why aren’t diesels supercharged from the factory? I understand turbos on racing engines that need lots of boost pressure, but it seems like on some of the newer OEM trucks a supercharger would work quite well.
When Tier 2 emissions standards went into effect in 2004, diesel engine manufacturers were tasked with finding a way to lower nitrogen oxide output. Their solution was found in the use of exhaust gas recirculation (EGR).
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