Report: Details of BMW’s new quad-turbo diesel inline-six surface

BMW was rumored not too long ago to be really pushing the envelope with their next-generation turbocharged diesel inline-six, particularly since claims were suggesting the new mill could come with four turbochargers, like a Bugatti Veyron’s W16. Now, it seems those rumors are true as BMW supposedly released some specific details on the new engine at the 37th International Vienna Motor Symposium in Austria.

With 3.0L of displacement and those four turbos, the BMW’s new diesel is described to offer at least 394hp and expectedly, lots and lots of torque, at 561 lb-ft of twist. And according to the latest report from BMW 7-Series enthusiast site, it is capable of producing a helluva-lot more, but is restricted due to the limitations of ZF’s eight-speed automatic.

That seems a bit ironic since the ZF eight-speed automatic is capable of handling the Dodge Charger and Challenger SRT Hellcat siblings and its supercharged 6.2L HEMI V8 with 707hp and 650 lb-ft of twist with some beefing up. So, something’s not quite making sense here.

Nonetheless, the first model to receive this new quad-turbo inline-six will be the current BMW 7-Series, but in 750d xDrive form. In that application, the 750d xDrive will supposedly sprint to 60 in just 4.5 seconds while topping out at the usual marker of 155 MPH. That will make the new car not only faster than the outgoing model with its tri-turbo setup, it’s supposedly five percent more efficient with fuel consumption.

BMW was also apparently able to save a few bucks with the new design as it reduces cost. Though the progressive design of the turbochargers still exists to assist with elminating turbo lag. In other words, two of the turbocharged are smaller than the remaining other two, allowing the smaller ones to work with the lower rev-range of the engine, while the larger turbochargers activate when the engine gets up to speed and outpaces the smaller snails.

No exact date was shared in terms of release, but it will be in the near future.

– By: Chris Chin




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  • Matt Mann

    Thinking it has more to do with a conservative, deliberate market approach. Then ramp up the HP & Torque with each successive year.

  • I’m sure it also has to do with the fact that anymore torque in a car that heavy will just drive the price up more than it has to be since they’ll have to probably add stronger tires and drivetrain components.

    Admittedly, in reference to the ZF 8-Speed in the Hellcat siblings, Chrysler most likely worked specially with ZF to make it handle that power so it’s probably bespoke to Chrysler’s agreement with ZF.

    – C