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Old 02-03-2015, 04:34 AM   #4
Retroman1969
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Join Date: May 2013
Location: Oklahoma City
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As much as I would love to believe all that, since that's where we are headed, I've been questioning the legitimacy of turbocharging being the "big solution" to the issue.
Here's an interesting excerpt from a related article to the one above:
"Turbos, which are powered by exhaust energy that is otherwise wasted, increase engine output by forcing extra air into the cylinders, prompting the fuel injectors to provide more fuel for combustion. More combustion, alas, means more heat. To keep the engine (and turbo) from overheating, turbo engines inject excess gas under boost. It seems counterintuitive, but this "rich mixture" cools down combustion and reduces exhaust temperatures. It's also a double-whammy fuel-economy killer, because burning that extra fuel doesn't help the engine make more power, it actually reduces output.
Government fuel-economy test cycles, especially those in Europe, approximate the driving style of a heavily sedated 83-year-old librarian. Since the engine is rarely taxed, the turbo doesn't spool up, so no extra fuel is used. But purposely driving slowly enough to keep the turbo from generating boost defeats the point of having a turbocharger in the first place. Sadly, out in the real world, riding that big, effortless wave of boosted midrange torque means burning extra fuel—and creating even more CO2. So much for reducing emissions."

Also:
"there's more to an engine's behavior than going fast in a straight line. The way an engine generates power—its personality, if you will—is just as important as the number of Mister Eds it replaces. Immediate, predictable response is a requirement in any driver's car. Naturally aspirated engines react without delay to throttle inputs, but a turbo engine is vastly more complicated. It has two torque curves—one when it's off-boost and one when the turbo is at full puff. The transition between the first curve and the second is what we call lag—and both how long it takes and how abruptly it occurs change continually. A naturally aspirated engine's output is determined by the position of the pedal and the engine speed, period. Turbos change that into a complicated matrix with far too many variables for a driver to keep track of. At best, turbo lag is a handicap. At worst, it turns neutral, throttle-adjustable cars into insolent, uncontrollable, four-wheeled bastards."

Sure I want to protect the environment, and since I drive so much for work, fuel economy is on my list. I have a bad taste in my mouth from turbos of the past, and I'm sure improvements have made that bad taste moot to an extent. However I'm clearly not alone in squinting an eye at all the claims of the new turbo engines. Especially in performance cars.
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Last edited by Retroman1969; 02-03-2015 at 04:52 AM.
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