During the 37th International Vienna Motor Symposium in Austria the world’s largest luxury automaker has presented its latest and greatest diesel engine, a quad-turbo, six cylinder mill packing 394 hp and 561 lb-ft.
This is an all new development for an inline-six 3.0-liter, which has four turbochargers and delivers 394 horsepower (294 kilowatts) from 4,000 rpm to 4,400 rpm. The torque number is of course insane, at 561 pound-feet (760 Newton meters) available between 2,000 rpm and 3,000 rpm. Believe it or not the powerplant is actually capable of more but they had to electronically cap it in order to avert damage to the eight-speed ZF automatic transmission. Naturally the first model line to feature the new flagship engine is the 7 Series in its 750d xDrive guise, capable of sprinting to 60 mph (96 km/h) in around 4.5 seconds before maxing out at the limited 155 mph (250 km/h).
The new quad engine is more powerful than its tri-turbo six-cylinder predecessor but also comes with a 5 percent increased fuel economy – while the manufacturer says it is also less costly for them to manufacture it. The main change between the engine versions has to do with the switch from a big low-pressure turbocharger to a couple of smaller ones. Other models to get the new engine are the X5 M50d and X6 M60d, as well as the next-gen M550d xDrive.