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2017 BMW 750Ld Quad-Turbo Diesel Passes Trucks on Autobahn at 155 MPH Top Speed

On paper, BMW's quad-turbocharged 3-liter inline-six is downright otherworldly, delivering a worthy predecessor for the current tri-turbo N75S animating M50d models. But what about the real world?
2017 BMW 750Ld Quad-Turbo Diesel Passes Trucks on Autobahn at 155 MPH 4 photos
Photo: YouTube screenshot
2017 BMW 750Ld Quad-Turbo Diesel Passes Trucks on Autobahn at 155 MPH2017 BMW 750Ld Quad-Turbo Diesel Passes Trucks on Autobahn at 155 MPH2017 BMW 750Ld Quad-Turbo Diesel in Autobahn parking
You see, while the trib-turbo 3.0-liter diesel has plenty of fans, there are also aficionados who claim the engine doesn't make that much of a difference compared to the now-good old twin-turbo 313 PS 3.0-liter BMW diesel.

Well, with 400 PS and 760 Nm (560 lb-ft) of torque, the fresh B57 certainly makes a world of a difference. And we're here to show you how that translates into real-world performance.

To be more precise, the piece of footage at the bottom of the page allows us to see a top speed run of a 2017 BMW 750d. And since the shenanigan takes places on the German Autobahn, passing trucks at the electronically limited 250 km/h (155 mph) top speed isn't an issue.

This makes for an excellent occasion for us to remind you of the tech details displayed by BMW's four-turbo 3.0-liter straight-six. While the tri-turbo mill features two small turbos and a large one, the new engine comes to replace the final part of that equation.

We're still dealing with multi-stage turbocharging and, once again, the first part of the deal involves two variable-geometry compact turbos being integrated into a single housing, while the larger turbo was replaced by a two smaller units that allow for a faster throttle response.

Usually, the engine will see the two low-pressure turbos, along with one of the high-pressure units, running. However, if the driver goes for serious acceleration from idle, the two low-pressure turbos will be bypassed, with a flap allowing boost to be built up quicker. As for the second high-pressure charger, this only steps in once the engine reaches 2,500 rpm.

But enough with theoretical part of the forced feeding - it's time to reach for that "play" button and let the Autobahn action unfold.

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About the author: Andrei Tutu
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In his quest to bring you the most impressive automotive creations, Andrei relies on learning as a superpower. There's quite a bit of room in the garage that is this aficionado's heart, so factory-condition classics and widebody contraptions with turbos poking through the hood can peacefully coexist.
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