BMW M’s original X5 and X6 M SUVs have been tweaked to keep up with Porsche’s Cayenne Turbo GT -
Mechanically, the pair keep hold of their twin-turbocharged 4.4-litre V8 engines, but now receive mild hybrid assistance that runs a small integrated starter motor and generator in the transmission housing on a stand-alone 48V electrical system. BMW M has mounted this secondary electrical system’s battery pack under the bonnet so as not to impact on cabin space, where it will help reduce load on the engine and offer a subtle kick from the electric motor under hard acceleration.
The engine itself has also picked up a collection of small detail upgrades including a redesigned cross-bank exhaust manifold, a reinforced crankshaft, minor changes to the internals of the turbochargers themselves, a redesigned oil sump and new oil pump. There’s also new catalytic converters in the exhaust system.
The transmission is BMW’s usual eight-speed automatic transmission, but has its own selection of refinements including new ratios, a new oil sump, redesigned internal hydraulics and active mounts. BMW M says these changes make the transmission even more responsive, and reduce the speed of the actual shifts.
The chassis itself is also significantly overhauled in comparison to the standard X5 and X6, with stiffening elements including strut braces above and a shear plate below the engine, lateral struts at the rear and a new tunnel bridge around the exhaust. The electric power steering and integrated braking systems have also been fiddled with, the latter controlling the same set of 395mm front and 308mm rear steel discs.
These should help keep the pair fresh in comparison to most of its main rivals that include everything from
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