Exhaust turbocharger
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The engine S63 TOP has 2 exhaust turbochargers with twin-scroll technology. The turbine wheels and compressors have also been revised. The change to the turbine wheels increased the flow rate and efficiency at low speeds of the exhaust turbocharger. Due to this change, the exhaust turbocharger is less sensitive to pumps. Therefore, a blow-off valve is not needed. The exhaust turbocharger has the known structure with a vacuum controlled wastegate valve.
The graphic below shows the exhaust manifold and cross-bank exhaust turbochargers with twin-scroll.
| Index | Explanation |
|---|---|
| 1 | Exhaust turbocharger |
| 2 | Turbine wheel |
| 3 | Vacuum unit of the wastegate valve |
| 4 | Exhaust manifold |