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BMW has announced what it claims to be the most powerful six-cylinder diesel passenger car in the world, the new #BMW-M550d-xDrive / #BMW . It features a new quad-turbo (yes, that’s right, four turbos!) 3.0-litre straight-six that develops 400hp and 561lb ft of torque and this helps the fastest diesel Five to break the 0-62mph dash in just 4.4 seconds. Yet it’s still capable of returning over 50mpg (depending on wheels and tyres fitted). The output of the new M550d xDrive is 19 hp higher than that of its predecessor – an increase of five percent – while maximum torque has been increased by 15lb ft. At the same time, average consumption and emission values have been reduced by 11 percent.
The engine of the #M550d now uses multistage turbocharging with four turbochargers to build up boost pressure even more quickly especially in the lower engine speed range with more than 332lb ft on stream at just 1000rpm. BMW says the use of a fourth turbocharger further optimises the engine’s efficiency and performance characteristics. As in the F10 M550d, the air flows into the combustion chambers by means of a multi-stage turbocharging process. At the high-pressure stage, two compact turbochargers are used with variable turbine geometry and integrated in a combined housing. The two lowpressure turbochargers are new and replace the previous largesized third turbocharger: with their reduced dimensions they make for an even more direct engine response. The two low-pressure turbochargers and one of the two high-pressure chargers are permanently powered during travel. The second high-pressure turbocharger is only added at engine speeds of over 2500 rpm. At high load requirement from idling, the two low-pressure turbochargers are briefly circumvented by means of a flap control system so as to build up boost pressure even faster.
As we went to press BMW UK said it wasn’t currently planning on bringing the M550d Drive to the UK market but that ‘discussions were ongoing’ – fingers crossed it makes these shores this time!Stream item published successfully. Item will now be visible on your stream.