One of them is the 390 kW (530 hp), 750 Nm (553 lb-ft), 4.4-liter petrol V8 that animates the BMW M850i xDrive Convertible, while the other presents itself as a 3-liter inline-six diesel unit making 235 kW (320 hp) and 680 Nm (501 lb-ft). The sprint from 0-60mph is claimed to take 5.0 seconds in the diesel-powered 840d, dropping to 3.7 seconds in the M850i. Yes, that's slower than the Coupe but then again, the drop top is considerably heavier too.
The 8 Series Convertible - unveiled unofficially on Belgian motoring site Autotijd yesterday - swaps the coupe's hardtop for a fabric roof that tucks into a small compartment behind the back seats when not in use. Whereas SEMA cars have just about every vehicle adjustment known to man, this new release only has one major change: a convertible top. The model also features standard Icon Adaptive LED Headlights with LaserLight technology that are the slimmest headlights of any BMW model to date. Regardless of the engine you go for, BMW will install an xDrive all-wheel drive setup and an eight-speed automatic transmission. A driving mode selector can be used to switch from a comfortable driving style to a sportier driving mode. The so-far-secret Convertible will follow the Coupe into showrooms before the end of 2019.
Removing a car's roof can also reduce the vehicle's body stiffness, causing it to flex when going around corners, so BMW has strengthened the Convertible's underpinnings with stiffer struts and panels.
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The four-seater cabriolet has a soft-top roof with fully electric operation, opening and closing at the touch of a button and when traveling at up to 50km/h (31mph).
The M Sport package for the 840d xDrive with specific design and equipment features: "front apron with extra-large air intakes, distinctive side skirt and rear apron design, 19" M light-alloy wheels, M Sport braking system, multifunction seats, M leather steering wheel and illuminated door sills with M logo.
To protect passengers in the event of a crash, BMW uses an automatically activated rollover protection system. A 10.25-inch center screen features the seventh generation of BMW's iDrive system, while a 12.3-inch display sits behind the wheel, replacing a traditional instrument cluster.