Soldato
- Joined
- 12 Aug 2004
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- 2,503
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- Oop North
Ollie's Gadgets said:What does a dump valve actually do other than make that cool psshhhh noise when you change gear? Pardon my ignorance.
When you close the throttle in a turbo you can have an overpressure in chamber, if you then open the throttle again (at a lower gas flow) the pressure imbalance will try to stall the turbo. Dump valves get rid of the over pressure to keep the turbo spinning at a high speed. At least that's how I understand/explain it.
Bear is also correct though when he says that most modern turbo will have a recirculating type valve anyway. The manufacturers know about this overpressure, so they try to counter it without a really loud PShhhh!! so that small children are not terrified of diesels.
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