The Bentley doesn't just have any old diesel engine; it's the spectacular 4-litre triple-charged V8 first seen in the Audi SQ7 that's just been launched here.
The big diesel V8 uses a remarkable forced induction set up that includes a constantly running active turbo, a spool-up-on-demand passive turbo and a thoroughly bonkers electric turbine that uses a 48-volt electric motor to spin it up to 70,000rpm in a quarter of a second.
The "electric turbo" starts things off by spinning up almost instantaneously, eliminating turbo lag during the time it takes the first (or active) turbo to get up and running.
Once these two get the Bentayga through the meat of the torque curve, the second (or passive) turbo is ready to take over and wind things up into the peak of power.
Where Audi uses artificial means to make the SQ7 sound angrier and more petrol-V8-like, the Bentley does not. This means everything you hear is the noise the Bentayga diesel naturally makes.
While the Audi is fruity, barrel-chested and bellowy,
the Bentayga is... largely silent.In fitting with being a Bentley,
the relentless acceleration is accompanied by a distant, subdued and extremely refined V8 rumble that rises only slightly in volume as the revs rise.On the outside, the Bentayga produces a subtle burble at idle. You really have to listen carefully to pick out ever-so-slight hints of diesel rumble.
The Bentayga diesel is easily the most refined and civilised diesel I personally have ever heard and allied to the traditional Bentley silence inside the cabin, is really a remarkable achievement.
But the Bentayga d
iesel, with its massive 900Nm of torque available from just 1000rpm is a surprisingly capable off-roader, with an excellent hill descent system.
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http://www.stuff.co.nz/motoring/road-tests/87570656/diesel-bentayga-suv-takes-bentley-down-the-road-less-travelled
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