BMW’s Incredible Quad-Turbo 750d Serves Up A Massive 400bhp And 560lb ft

Remember that astonishing quad-turbo BMW diesel engine we spoke about a couple of weeks ago? Well, here’s what it’s being fitted to: the 750d and 750Ld xDrive.

Along with the announcement of the car, we’ve now had confirmation of the power and torque outputs: 394bhp and 560lb ft, which matches claims made in a prior report from Bimmerpost. According to BMW, that makes this ‘B57’ 3.0-litre engine the world’s most powerful six-cylinder diesel.

As a reminder, the B57’s triple-turbo ‘N57S’ predecessor used a small turbocharger for low revs, with a larger one kicking in at the mid-range and another little blower for high engine speeds. In the B57, that bigger turbo is replaced with two smaller turbos. The resulting 394bhp output gives the 750d a 0-62mph time of 4.6 seconds, while the long wheelbase version is a tenth slower owing to the extra weight.

Where things get really interesting is torque deployment. The B57 makes 332lb ft of twist at just 1000rpm, with the full 560lb ft felt from 2000-3000rpm. It’d be good for even more than that, if the eight-speed, ZF-sourced gearbox could actually take any further torque without being in danger of going pop.

Speaking to a BMW UK representative today, we were told that the 750d xDrive unfortunately won’t be making it to our shores. BMW wasn’t able to confirm whether or not the B57 will make an appearance in another of its cars, but hinted that it’s likely. So, it’s reasonable to speculate that we’ll get a successor to the mighty M550d in the near future.