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[quote][i]Originally posted by GIBBS[/i] [quote][i]Originally posted by GSi_16v[/i] The wastegate is a flap inside the turbo which opens to leak boost out when it reaches a set amount. The wastegate actuator contains a spring and diaphragm that senses the pressure and opens the wastegate A dump valve (blow off valve outside Europe) is similar in construction to an actuator, in that it contains a spring and diaphragm (or piston). It's job is to open when the inlet manifold is in vacuum - throttle off on a turbo car. Posted: Thu Mar 25, 2004 1:53 pm Post subject: -------------------------------------------------------------------------------- The wastegate is a flap inside the turbo which opens to leak boost out when it reaches a set amount. The wastegate actuator contains a spring and diaphragm that senses the pressure and opens the wastegate, as standard this happens at ~6psi (manifold pressure). A dump valve (blow off valve outside Europe) is similar in construction to an actuator, in that it contains a spring and diaphragm (or piston). It's job is to open when the inlet manifold is in vacuum - throttle off on a turbo car. with out a dump valve when the throttle is lifted, boost produced by the turbo that has not yet entered the inlet has nowhere to go. Normally it bounces off the closed throttle plate and back towards the turbo, where it hits the spinning blades and reverberates off them, making the chattering noise. This can cause bearing failure and also in severe cases, the impeller blades to shatter and get sucked into the engine. Not a pretty sight. if u are runin high boost [/quote] dependant on turbo configuration, larger aftermarket turbo's do not have internal wastegate's and use an external wastegate which makes the noise. i don't see the point at all in you posting all the above, it proves nothing towards your point. [/quote]
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