Twin Scroll Turbocharger

When an engine has a common exhaust manifold that takes exhaust gases from individual cylinders to the turbocharger turbine, exhaust gases from one cylinder interfere with another cylinders ability to expel its exhaust gases depending on the firing order of the engine. The result of this back pressure in certain cylinders is turbo lag which is common on most stock cars equipped with a turbo charger. Turbo lag occurs when exhaust gases from the engine fail to supply enough air to spin the turbine of the turbocharger at the required speed. 

A twin scroll supercharger separates the exhaust manifold of cylinders whose exhaust gas pulses interfere with each other. This allows exhaust gases from a cylinder to pass freely through the exhaust manifold and spin the turbine of the turbocharger located further down the exhaust manifold after the separate exhaust paths from the engine’s cylinders meet. When a turbocharger receives a constant amount of air from the exhaust gases the turbine in the exhaust manifold spins at the required speed allowing the turbocharger to suck in clean air from the car’s air vent under the bonnet which increases airflow into the cylinders allowing higher fuel/air mixture which allows the engine to generate more power.