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Wrong, there might be a little gas pushing past the wast gate but not enough to stop out of control spool of the turbo, as said above the only thing stopping unlimited boost is the ECU cutting the fuel pump. If you don't believe it then hard wire you fuel pump and try it, you will get 2.5 bar, just before your con rods are turned into bananas.
not strictly true!!!if there is no hose on the w/g then the opening point will be spring pressure,meaning the exxhaust gas will open the valve at the given pressure,NOT give unlimited boost
Nope. The spring keeps the valve CLOSED. Without pressure to the lower chamber there is NOTHING to open the WG valve.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Having done this as a test I can tell you you get boost until ecu cut. .... it will only open at spring pressure with a boost source to the lower chamber
^^This^^
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Nope. The spring keeps the valve CLOSED. Without pressure to the lower chamber there is NOTHING to open the WG valve.
There is actually.
Exhaust gas pressure does press on it from below, but that pressure is fairly negligible, because of the way it's oriented.
But if you would take the spring out for example, then the gases would push it open and you'd get no boost. Or if you would fit a 0.1 bar spring, it'd also push it open with just the pressure of the exhaust.
P.S. I know this is not very relevant, as no one is running anything less than 0.4 bar spring, but I thought it's correct to point out.
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