The Alpina D4 Cabrio (F33) 3.0d, produced between 2014 and 2017, represents a unique blend of luxury, performance, and diesel efficiency within the BMW 4 Series Convertible (F33) lineage. Alpina, a renowned German automotive engineering company, took the already capable BMW platform and elevated it with significant powertrain and chassis enhancements. This particular variant, equipped with the 3.0-liter inline-six diesel engine producing 350 horsepower and paired with the Switch-Tronic 8-speed automatic transmission, occupied a niche position as a high-performance diesel convertible aimed at discerning buyers seeking a refined driving experience. It served as a more exclusive and powerful alternative to the standard 4 Series diesel models.
Technical Specifications
| Brand | Alpina |
| Model | D4 |
| Generation | D4 Cabrio (F33) |
| Type (Engine) | 3.0d (350 Hp) Switch-Tronic |
| Start of production | 2014 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 6.6 l/100 km (35.6 US mpg, 42.8 UK mpg, 15.2 km/l) |
| Fuel consumption (extra urban) | 5.5 l/100 km (42.8 US mpg, 51.4 UK mpg, 18.2 km/l) |
| Fuel consumption (combined) | 5.9 l/100 km (39.9 US mpg, 47.9 UK mpg, 16.9 km/l) |
| CO2 emissions | 155 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5 sec |
| Acceleration 0 – 62 mph | 5 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 275 km/h (170.88 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.2 kg/Hp, 192.8 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 385.7 Nm/tonne |
| Power | 350 Hp @ 4000 rpm |
| Power per litre | 116.9 Hp/l |
| Torque | 700 Nm @ 1500-3000 rpm (516.29 lb.-ft. @ 1500-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Kerb Weight | 1815 kg (4001.39 lbs.) |
| Max. weight | 2265 kg (4993.47 lbs.) |
| Max load | 450 kg (992.08 lbs.) |
| Trunk (boot) space – minimum | 220 l (7.77 cu. ft.) |
| Trunk (boot) space – maximum | 370 l (13.07 cu. ft.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 UK gal) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4640 mm (182.68 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1382 mm (54.41 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1552 mm (61.1 in.) |
| Rear (Back) track | 1576 mm (62.05 in.) |
| Front overhang | 787 mm (30.98 in.) |
| Rear overhang | 1043 mm (41.06 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Switch-Tronic |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/35 ZR19; 265/35 ZR19 |
| Wheel rims size | 8J x 19; 9J x 19 |
Powertrain & Engine Architecture
At the heart of the D4 Cabrio lies Alpina’s version of the BMW N57D30 inline-six diesel engine. While based on the BMW unit, Alpina extensively modified it with two specially developed turbochargers, a larger intercooler, and a revised engine management system. These upgrades resulted in a significant power increase to 350 hp and a substantial 700 Nm (516 lb-ft) of torque, available from a low 1500 rpm. The engine utilizes a diesel commonrail direct injection system, ensuring precise fuel delivery and efficient combustion. The Switch-Tronic 8-speed automatic transmission, also sourced from BMW but recalibrated by Alpina, provides smooth and rapid gear changes. Alpina’s tuning focused on optimizing shift points for both performance and fuel economy.
Driving Characteristics
The D4 Cabrio 3.0d delivers a surprisingly potent driving experience. The high torque output provides effortless acceleration in everyday driving situations, while the 350 hp ensures brisk performance when pushed. The 0-60 mph sprint takes approximately 4.8 seconds, and the car boasts a top speed of 170.88 mph. Compared to the standard 4 Series diesel models, the Alpina offers a noticeably more responsive throttle and a more engaging driving feel. While not as overtly sporty as the gasoline-powered M4, the D4 Cabrio provides a unique blend of comfort and performance. The Switch-Tronic transmission contributes to this balance, offering both automatic convenience and the ability to manually select gears for more spirited driving.
Equipment & Trim Levels
The Alpina D4 Cabrio was generously equipped as standard. Interior features included premium leather upholstery, Alpina-specific interior trim (often featuring wood or carbon fiber accents), sport seats, and a high-end audio system. Standard exterior features included Alpina’s signature aerodynamic body kit, unique alloy wheels, and stainless steel exhaust system. Optional extras included a panoramic sunroof, adaptive suspension, and various driver assistance systems. The overall ambiance was one of understated luxury and refinement, reflecting Alpina’s commitment to creating exclusive and personalized vehicles.
Chassis & Braking
Alpina made subtle but effective changes to the chassis to complement the increased power. The suspension was retuned with stiffer springs and dampers, resulting in improved handling and reduced body roll. The car featured ventilated disc brakes on all four wheels, providing ample stopping power. The standard ABS (Anti-lock Braking System) and electronic stability control further enhanced safety. The steering was precise and well-weighted, offering good feedback to the driver.
Market Reception & Comparison
The Alpina D4 Cabrio was generally well-received by automotive critics. It was praised for its powerful engine, refined driving experience, and luxurious interior. Compared to the standard 4 Series diesel models, the Alpina offered a significant performance upgrade and a more exclusive feel. However, it came at a premium price. Compared to the gasoline-powered M4, the D4 Cabrio offered a different kind of performance – one focused on effortless torque and fuel efficiency rather than outright speed. Fuel economy was a strong point, with combined figures around 39.9 US mpg, making it a relatively efficient high-performance convertible.
Legacy
The Alpina D4 Cabrio (F33) 3.0d has established itself as a desirable used car. The N57 diesel engine is known for its durability and reliability, provided it has been properly maintained. The Switch-Tronic transmission is also generally reliable. However, as with any high-performance vehicle, regular servicing and preventative maintenance are crucial. Today, these cars appeal to enthusiasts who appreciate the unique combination of luxury, performance, and diesel efficiency that Alpina offered. They represent a distinctive alternative to the more common 4 Series variants and are likely to hold their value as collectible automobiles.
