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[QUOTE]Originally posted by XN6guy
A turbodiesel *would* show a gain in power automatically. The turbocharger would not have to work as hard pull in air--thus the turbine wouldn't need as much energy from the exhaust, etc.
That sounds like it would be true, but how hard the turbo "works" is irrelevant when it comes to engine power, because as you know, it is not driven by engine horsepower, but by waste gasses from the exhaust. Diesels run with "excess air" most of the time, so an increase in air from any source, whether it be improvements in the turbo, filter, manifold, or whatever, will mean nothing without additional fuel. Contrary to gas-engine wisdom, a filter with increased air flow in a diesel is not worth the cost in additional contaminants that will be allowed into the engine to cause additional wear.
Mike
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