Called the ’B6 Bi-Turbo Cabrio’, Alpina has improved the luxury cabriolet’s performance capabilities by adding its own twin-turbo system - hence the name - together with MAHLE pistons and a high-performance cooling system.
As a result, the 6-Series Convertible’s 4.4-liter V8 engine gained some significant ponies, pushing the standard output of 400 horsepower and 450 lb/ft of torque all the way up to 500 horsepower at 5,500 rpm and 516 lb/ft of torque between 3,000 and 4,750 rpm. Alpina also revised the gearbox on the car, putting in a new eight-speed automatic transmission.
Together with this revised gearbox, the 25% increase in output allows the Alpina-tuned ’B6 Bi-Turbo Cabrio’ to hit 0-62 mph in just 4.8 seconds (up from 4.9) with a top speed hitting an impressive 193 mph, a stark improvement from the standard model’s electronically limited top speed of 155 mph.
On top of that, the Alpina-tuned 6-Series Convertible averages 10.9 L/100km (25.9 mpg UK / 21.5 mpg US) and emits 255 g/km, impressive numbers for a car of this stature.
The car will make its official debut in Geneva next March, but at the very least, we’re getting a good idea on what Alpina has done to improve on the 6-Series Convertible’s already impressive performance capabilities.