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supercharger vs turbo sound....
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[quote][i]Originally posted by richard_syko[/i] A recirculating dump valve is mostly used where dumping the charger air to atmosphere would lose metered air - that is, air that has already been measured in the ECU by a Mass Air Flow meter. Losing this air to atmospehere would cause incorrect fuel/air ratio - make it run rich. The valve is driven from the amount of manifold pressure seen after the throttle body. At idle and part throttle settings there is (generally) a partial vacuum in the manifold. At these times, the valve would remain open and recirculating the air from the charger outlet back to the charger inlet. At wide open throttle the manifold pressure is near to atmospheric then goes positive as boost comes on. At these times the valve shuts tight and so no boost is lost back to the charger inlet - its all going into the manifold/engine. With a supercharger, whether a positive displacement type (G60, Eaton etc) or Centrifugal (Z-Eng, Vortech etc) the air would be recirculating all the time there is a part throttle setting. As soon as you gun it, the valve shuts and all the boost enters the engine. Change gear quickly, and you will get a chuff as when you let go of the throttle, vacuum happens in the manifold, valve opens, vents - you get the picture. So the choice of using a recirculating dump valve, or an open to air one, and where to locate it, can be made by looking at your charger setup. As long as you start metering the air entering the engine after the 'loop' or open part of the circuit, you are OK - otherwise, like I said, you will lose metered air. NOW - heres something to bake your cookie: Would fitting a recirc valve to Centrifugal Supercharger setup (Vortech, Z-Eng etc) cause more drag on the engine? Doesnt it go that load on the Supercharger is directly related to air flow through it - so increasing the flow will increase the load? Think about a hair dryer - cover the exit nozzle up with your hand (make sure its on a cold setting!) and you will observe that the motor inside races faster and faster. Thus you have reduced the flow, the load on the motor dropped, so it went faster. Let your hand go, and the motor slows down as its now flowing air. Work that one out! [/quote]
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