What is the function of bypass valve in turbocharger?

The bypass valve in a turbocharger, often referred to as a wastegate, regulates the flow of exhaust gases to maintain optimal boost pressure. When the desired boost level is reached, the valve opens to divert excess exhaust flow away from the turbocharger, preventing over-boosting and potential engine damage. This helps ensure efficient performance and protects the engine by maintaining safe operating parameters. Additionally, the bypass valve aids in improving throttle response and reducing turbo lag.