BMW Details the Quad-Turbo Diesel in the 2017 7-Series
Most Powerful Six-Cylinder Diesel in a Production Car, Possibly Ever
BMW released the specifications of its long-rumored, recently confirmed quad-turbodiesel 3.0L I-6 today, revealing at least one new record.
The engine, which will make its way under the hood of the company’s flagship 7-Series sedan, is reportedly the world’s most powerful passenger car diesel I-6 at 400 hp. The quad-turbo engine also produces 560 lb-ft of twist, which will no doubt keep the BMW 750d xDrive moving at a good pace. BMW also claims its big boy will get around 40 miles per U.S. gallon with low CO2 emissions.
Those numbers are impressive on their own, but considering the competition, they’re even more compelling. BMW’s own gas-powered 750i sedan produces a bit more power (445) from its 4.4L twin-turbocharged gas V-8, but its 480–lb-ft torque rating is far less than its oil-burning counterpart. Furthermore, its combined fuel economy rating of 19 mpg is roughly half that of the 750d. Even if BMW’s efficiency numbers for the diesel are optimistically inflated, it should still get far superior fuel economy.
According to BMW, engineers went to great lengths to ensure the diesel I-6 was a legitimate V-8 alternative, rather than a mere efficiency special. As such, its performance very closely mirrors that of the 750i, falling just a few tenths of a second behind in the sprint to 60 mph. Two individual compound-turbo setups (four snails in total) mean reduced lag and better throttle response, encouraging favorable comparisons with the smooth, quick-revving gas V-8.
Keeping the 750d running clean is a diesel particulate filter, a NOX catalytic converter, and a selective catalyst reduction system that injects AdBlue into the exhaust. Precise piezo fuel injectors fed by a common rail start the combustion process efficiently, which further reduces emissions from the get-go.
If it sounds like we’re salivating and singing the BMW’s praises, that’s because we are. We’ve never driven such a machine, and we’re champing at the bit to try one out. Whether or not the high-performance diesel gets sent to the United States is yet to be seen, but with BMW’s diesel reputation thus far untarnished, we hope the company will be brave and give us a crack at the 3.0L quad-turbodiesel I-6 in one of its offerings soon. It’d be a great addition to America’s 7-Series lineup, and it would also fit nicely in a fullsize SUV like the upcoming X7.