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Here's why a dual volute turbo is the way to go.

Back in 2018, GM revealed a new 2.7-liter turbocharged inline-four for use in its Silverado pickup. Despite being developed specifically for truck applications, it's since been selected as the power plant for Cadillac's new entry-level performance sedan, the CT4-V. Both variants of the 2.7 use a cool "dual volute" turbo design that improves response and low-end torque. Here's how it works.

A dual volute turbocharger is exactly what it sounds like. Instead of using one volute to channel exhaust air into the turbine, it uses two. Both volutes are integrated into the exhaust manifold, which attaches directly to the engine's head. In this specific application, cylinders one and four are paired to one volute, while cylinders two and three are paired to the other.

What are the advantages? As Road & Track contributor Jason Fenske explains in his latest video above, a dual volute setup means the turbo can keep exhaust pulses separated before they reach the compressor wheel, minimizing any positive pressure going back into the engine. And since the volutes are designed to dump exhaust gases on opposite sides of the turbine, those pulses don't ever overlap. This design also means the turbine housing can be closer to the turbine itself, improving efficiency and response.