We’ve heard of manufacturers doing just about everything feasible to make the turbocharger as efficient and as cutting edge as possible. Though twin turbo V6 setups have become near commonplace, a tri-turbo setup hadn’t been done before on a diesel.
[youtube id=”95vQpR2jMcQ” width=”800″ height=”450″]Obviously BMW wasn’t satisfied with the conventional layout of turbo-diesel engines, so they decided to take a stab at making it more efficient. This engine made its premiere on last year’s M550d xDrive and will be available on more and more models in the coming years. The engine is a 3.0 liter V6 producing 381 hp, and three turbochargers are featured in the new setup. The first, a smaller unit, kicks on when the engine powers up and utilizes variable turbine geometry to maximize power in lower rpm ranges, ensuring fast acceleration. At 1,500 rpm, a larger, medium sized turbocharger comes in, allowing the engine to reach peak torque. At 2,700 rpm a third, smaller turbocharger comes in, situated before the larger turbo and tasked with compressing the incoming air before it reaches the larger unit. All three turbochargers are manufactured by Borg Warner, and the total maximum pressure for the system is 50.8 psi. A common rial injection system delivers fuel, and this system is much improved over previous iterations, allowing for maximum fuel delivery at 31,900 psi.