How a car works

All partsBMW M4 CSLS58 engineTurbochargersTurbo 1 (cyl 1–3) › Wastegate

Wastegate

Part of Turbo 1 (cyl 1–3) · about $380 to replace

What it is

Electrically actuated flap in the turbine housing.

What it does

Bypasses exhaust around the turbine to cap boost.

How it fails

Rattle at idle is a worn flap pivot; the actuator is recalibrated with a scan tool.

MaterialStainless flap, electric actuator
SpecActuator travel 12 mm
0–100 % in 120 ms
Wastegate highlighted on the car

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