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Diesels & altitude
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all this sounds about right. Automobile and light truck engines use a waste gate turbocharger which would need to be tuned for a higher altitude either mechanically or electronically depending on the year of the engine. <br /> <br />Another factor would be fuel rack limiting devices that limit smoking during acceleration. These devices limit fuel rack position when air becomes limited for the amount of fuel being injected at the time, normaly during acceleration when a turbocharger can momentarily lag behind engine demands. If available air falls below the capacity of a turbocharger, this device will limit the fuel system and power of the engine to maintain a clean exhaust. Disabling this system for more power is a mistake. I have seen this common practice in poorer countries, and all the black smoke is nothing more than wasted fuel. I one saw valves from such an engine that had carbon deposits on the stem that literaly modeled the shape of the entire port! no wonder the owner complained of lost power!
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