It’s possible the new Black Edition could also be offered with a twin-turbo 4.0-liter V8 as the prototype has a number of similarities to the Bentayga S. If that’s the case, this variant would likely have 542 hp (399 kW / 550 PS) and 568 lb-ft (770 Nm) of torque. Given these lower numbers, it shouldn’t be surprising to learn the dash to 60 mph (96 km/h) would require 4.4 seconds while the top speed would be a slightly less impressive 180 mph (290 km/h).
Source: carscoops.com