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Whoooah. All serious aircraft that have turbos have a "PRV"-pressure relief valve on the intake manifold, set to open a few inches above the max boost level you contemplate on maintaining (turbo-normalized models). They are able to maintain sl pressures in the intake at elevation, so they are referenced to know the difference. The one I'm using opens at 35", even if at 20,000 feet.
Marc Wiese
I also understand the blow-off valves are useful in car applications, where
the driver will shut the throttle suddenly after a period of high boost. The
turbo can not shut down so fast and the compressed air has no place to go.
The valve than releases the air out to prevent damage. I don't see why we
need blow off valve in aircraft?
Bulent
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