The no-replacement-for-displacement die-hards aren't all wrong about turbo tech; it isn’t flawless. But there is one interesting fix for some of its problems, and it is the twin-scroll turbocharger.
. While a significant number of more-attainable performance cars introduced down the line used twin-turbos in either a sequential or parallel setup, such as Mazda’s RX-7 and Nissan’s 300ZX, respectively, twin-turbocharging remained relegated primarily to higher-end vehicles.There is one other option to solve the problems of lag and exhaust flow, however, and it is the twin-scroll turbocharger.
Additionally, making one scroll large and routed to the outer edges of the turbine blades, and one scroll small and routed to the inner section of the turbine blades, allows for airflow that is optimized for the entire rev range. The small scroll allows for faster airflow—and less lag—at low RPMs, and the large scroll keeps the powerband strong even at high RPM. This reaps the benefits of a sequential twin-turbo system with vastly less complexity.
In short, twin-scroll turbos deliver more power from less fuel than a single turbo, and provide similar power to a twin-turbo setup with vastly lower weight and fewer parts.How much less fuel? When BMW transitioned from using two single-scroll turbos to using one twin-scroll turbo on its “TwinPower” straight-six motors,
“reduction of fuel consumption by up to 9 percent” while still delivering the same horsepower and torque numbers.testing performed by DSportMag , changing from a single-scroll to a twin-scroll turbocharger on a single-turbo four-cylinder engine increased horsepower and torque by 20% at midrange RPMs, and simultaneously shaved half a second or more off of turbo-lag time. DSportMag noted that the change was so drastic with a twin-scroll turbo, to see equivalent improvement with a single-scroll turbo, they would need to increase displacement by 12% in their 2.4-liter motor.
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