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On 18 Jun 2004 at 8:12, Steven Ayres wrote: > What I meant to ask, rather, is that if the supercharged system is > set up to provide the correct fuel mixture at sea level, wouldn't that > mixture still change at altitude? The mechanism is constant, but the > air density is not, right? Or are you saying that with elevated intake > pressure, the density differential just becomes negligible? If the supercharger were set up (this is hypothetical) so that it always put out sea level pressure, then there would be NO change in density. Yes, it's possible to do this, or you could set it up to put out any constant absolute pressure. But the reality is that I believe they are usually set up to give a particular boost above the current relative pressure. > => Supercharging, even if it only brought the intake pressure > => back up to sea level, would keep our outputs constant > > Are we comparing no supercharger at sea level vs. supercharger at altitude? Well, yes, that would be the same thing as a supercharger that always put out sea level pressure. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org