BMW 750d 1

BMW recently revealed its new 3.0 litre turbodiesel, and it appears the oil burner, which is bolted to four turbochargers, has found its way into the new G11 BMW 750d xDrive and G12 BMW 750Ld xDrive (the latter is the long-wheelbase version). The diesel 7 Series duo is set to go on sale in Europe in July 2016.

In this setup, the 3.0 litre in-line six-cylinder diesel engine churns out 400 hp at 4,400 rpm, with over 450 Nm of torque available at just 1,000 rpm. Peak torque is a healthy 760 Nm at 2,000 to 3,000 rpm. As detailed earlier, this represents an increase of 19 hp and 20 Nm from the outgoing N57S tri-turbo mill that currently powers several M Performance models like the M550d, X5 M50d and X6 M50d.

Mated to the engine of both 7 Series versions is an eight-speed Steptronic transmission and BMW’s xDrive all-wheel drive system. The German marque also provided a few tantalising figures to highlight the powertrain’s capabilities.

BMW 750d 2

On the performance front, the 0-100 km/h sprint will be done and dusted in just 4.6 seconds for the standard wheelbase 750d xDrive, while the 750Ld xDrive achieves the same feat one tenth of a second later. This represents an improvement of 0.3 seconds over its predecessor. Top speed for both variants is an electronically-limited 250 km/h.

Those who prefer the eco side of things will be glad to know that the 750d xDrive and 750Ld xDrive return a fuel consumption of between 5.9L to 5.7L per 100 km (combined cycle). CO2 emissions meanwhile are between 149 and 154 grammes per km based on the EU test cycle. According to BMW, the new mill is 11% more fuel efficient and kinder to the planet than the outgoing three-turbo unit, despite being more powerful.

BMW’s most powerful six-cylinder benefits from several features, which the carmaker is more than happy to explain. For starters, the maximum combustion pressure has been increased from 200 bar to 210 bar. The new mill also gets the latest iteration of common-rail direct injection technology, whereby maximum injection pressure has been increased to over 2,500 bar.

Druck

The highlight here is of course the fourth turbocharger. Twin smaller low-pressure turbochargers replace the previous single turbine, and join two high-pressure units as before. BMW claims this allows for a quicker response time from the turbos. A new engine management system (Digital Diesel Electronics) is also put in place to coordinate the activity of the engine and its turbochargers.

Another new feature here is exhaust gas recirculation for the low-pressure stage of the turbocharging system as well as the high-pressure stage. To enhance efficiency, the engine also utilises an indirect system of charge air cooling with higher capacity than that used by the outgoing engine, aided by an additional compressor backplate cooling for the low-pressure turbos.