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2026. 6. 30. 작업

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What is the function of a blow-off valve vs a wastegate?

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The waste gate is designed (as you'll see in Bob's excellent answer to his linked question) to avoid spinning the turbo up unless needed. This saves fuel and wear. The blow off valve or dump valve is designed to stop a compression wave passing back into the turbo when you close the throttle, as this wave could stall the turbo completely, which can put high stress on the turbo, as well as making it take a long time to spin back up again (turbo lag)