How it works: Twin Scroll Turbo

How does a Twin Scroll Turbo work exactly?

Well, that’s a great question, and it deserves a proper answer, but first, why would we even want a twin scroll turbo?

Twin scroll refers to the turbine housing having two inlet ports leading to parallel channels for exhaust gas to flow into the turbine.

This makes for better response, because the turbocharger spools up faster, due to the airflow being more consistent.

The airflow improves because a twin scroll turbo feeds the turbine from 2 different sets of cylinders, one manifold feeds one inlet.

The firing order of the engine determines how this arrangement works.

But a picture says more than a thousand words, so how about a video?