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JimA=> they are usually set up to give a particular boost => above the current relative pressure. Exactly. So the differential between sea-level and mile-high intake air density remains, whether supercharged or not. The question is whether this differential affects fuel mixture under supercharged conditions the same way it does with normal aspiration, assuming a real-world supercharged system. Obviously if you add air to a given carb at high altitude, you'll compensate for lower local pressure. But a supercharged system involves more than adding a blower to a carb, no? You have to adjust the carburetor's fuel-metering to make efficient use of the additional air. So it seems to me that high-altitude considerations will still hold sway vis-a-vis the fuel mixture. I can see the possibility that beyond a certain amount of boost, the atmospheric pressure differential becomes negligible (the turbofan being an extreme example), but if so I wonder how high that bar is, so to speak. Steven Ayres, Prescott AZ '66 KG1600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org