| Black Hearts |
05-13-09 02:17 AM |
nvm...google was my friend
"The wastegate (WG) is part of a feedback loop used to limit boost. The boost controller, be it manual or electronic, the turbo, and the wastgate make up the elements of the loop. As boost builds, the controller monitors the pressure. When the pressure exceeds the controller's set point, it supplies air pressure to the WG actuator (the thing that moves the WG). The WG opens and diverts some of the exhaust flow away from the turbo. The turbo slows a little and the boost drops to below the controller's set point. When this happens, the controller stops supplying air to the actuator and the WG closes. The cycle repeats over and over until you stop nailing the accelerator!
How much the boost varies about the set point is a function of the "gain" of the loop and how much it is "dampened." It's more than you probably want to know.
There is a spring in the WG actuator that has a lot to do with how well the WG remains closed while boost builds. The WG actuator has to overcome the spring force to open the WG. The exhaust gas pressure isn't very significant so the actuator has to do most of the work. The spring force has an affect on the "gain" of the loop, so it can affect the loop response time.
so to answer your question; yes its suppose to stay closed unitl needed
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