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Old 08-05-2015, 09:41 PM   #13 (permalink)
UFO
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Join Date: Sep 2010
Location: Denver, CO
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Colorado - '17 Chevrolet Colorado 4x4 LT
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Quote:
Originally Posted by oldtamiyaphile View Post
Although the mechanism differs from petrol, diesels main party trick is changing AFR to suit load conditions. A diesel can run 100:1 at idle and 14:1 under load. If diesels always ran lean, they wouldn't make smoke under heavy load - even the latest BMW will put out visible smoke if driven hard.
Sure, I see plenty of overpowered diesel pickups that smoke like trains, but that's because they've chipped them to make more power by adding fuel. But in a factory setup, it's difficult to make them smoke because they are designed to be clean. Volkswagens are some of the cleanest around. When I get mine emissions tested (at load), it regularly turns less than 6% opacity. They are designed to run lean of stoichiometric.
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