Based on BMW 4 Series, the D4 BiTurbo is the result of a two year development programme during which every aspect of the vehicle was analysed and refined to increase performance, comfort, efficiency and style. Using design and validation processes identical to those implemented by BMW, ALPINA’s team of 70 development engineers worked with specialist suppliers to enhance the engine, gearbox, cooling system, body structure, wheels, tyres, aerodynamics, suspension and interior.
The BMW ALPINA D4 BiTurbo’s lightweight powertrain is based on BMW’s aluminium three litre straight six running ALPINA’s own engine control unit with bespoke software. With the same astonishing powertrain as the D3, the new two door delivers 350 hp and a remarkable 700 Nm of torque with a combined cycle fuel economy of 53.2 mpg and CO2 emissions of just 139 g/km. The result is a top speed of 173 mph, 0-62 mph in just 4.6 seconds.
The eight speed transmission has been developed in partnership with ZF to provide a very fast shift speed while ensuring durability with the D4 BiTurbo’s immense torque. Around 20 percent of the system is bespoke, developed with ZF specifically for ALPINA. Linked to recalibrated software, the system provides smooth, comfortable gear changes with no noticeable interruption to power delivery. In Manual mode, the driver can take complete control of the transmission using the unique ALPINA Switch-Tronic buttons on the back of the steering wheel for intuitive fingertip control. The driveshafts and differential are also reinforced and a limited slip differential is available as an option.
Wheels are ALPINA’s legendary ‘Classic’ style, in a new 19” design carrying non-run-flat Michelin Pilot Super Sport tyres developed in partnership with the tyre company specifically for the ALPINA D3 and ALPINA D4 BiTurbo. Brembo callipers in ALPINA Blue announce a bespoke braking system with 370 mm discs and four piston callipers at the front and 345 mm discs with twin piston callipers at the rear. ALPINA has also recalibrated the control software for the power steering, the Dynamic Stability Control and the Dynamic Traction Control.