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A supercharger is constantly spoiled from pulleys even at idle. This additional air pressure must be released at idle to prevent excess idle surge. The air release typically is performed through a bypass valve (can be replaced with blow off valve) and the air escaping tends to create a whistle. The remaing air sounds from pressure release in between shift points are identical to the process/sounds in which a turbo releases excess air pressure. However, a turbo is exhaust driven and the excess surge in pressure does not occur at idle which is why they are much quieter when sitting still. A supercharger is constantly spoiled from pulleys even at idle. This additional air pressure must be released at idle to prevent excess idle surge. The air release typically is performed through a bypass valve (can be replaced with blow off valve) and the air escaping tends to create a whistle. The remaing air sounds from pressure release in between shift points are identical to the process/sounds in which a turbo releases excess air pressure. However, a turbo is exhaust driven and the excess surge in pressure does not occur at idle which is why they are much quieter when sitting still.
What else can I help you with?
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