The Alpina Roadster V8 4.8i, produced between 2002 and 2006, represents a unique collaboration between BMW and the independent German automotive engineering firm, Alpina. Based on the BMW Z8 platform, the Roadster V8 was Alpina’s interpretation of the luxury roadster, focusing on delivering a blend of high performance, refined comfort, and exclusivity. It occupied a niche position above the standard Z8, offering a more potent engine and a distinct Alpina character. This model is particularly notable for its naturally aspirated V8 engine and its limited production run, making it a sought-after vehicle among collectors and enthusiasts.
Technical Specifications
| Brand | Alpina |
| Model | Roadster V8 |
| Generation | Roadster V8 |
| Type (Engine) | 4.8 i V8 32V (381 Hp) |
| Start of production | 2002 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 15 l/100 km (15.7 US mpg, 18.8 UK mpg, 6.7 km/l) |
| Fuel consumption (extra urban) | 7.5 l/100 km (31.4 US mpg, 37.7 UK mpg, 13.3 km/l) |
| Fuel consumption (combined) | 9.3 l/100 km (25.3 US mpg, 30.4 UK mpg, 10.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5.0 sec |
| Maximum speed | 260 km/h (161.56 mph) |
| Weight-to-power ratio | 4.2 kg/Hp, 235.9 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 322 Nm/tonne |
| Power | 381 Hp @ 5800 rpm |
| Power per litre | 78.8 Hp/l |
| Torque | 520 Nm @ 3800 rpm (383.53 lb.-ft. @ 3800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 4837 cm3 (295.17 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Piston Stroke | 89 mm (3.5 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Kerb Weight | 1615 kg (3560.47 lbs.) |
| Max. weight | 1950 kg (4299.01 lbs.) |
| Max load | 335 kg (738.55 lbs.) |
| Fuel tank capacity | 73 l (19.28 US gal, 16.06 UK gal) |
| Length | 4400 mm (173.23 in.) |
| Width | 1830 mm (72.05 in.) |
| Height | 1320 mm (51.97 in.) |
| Wheelbase | 2505 mm (98.62 in.) |
| Front track | 1550 mm (61.02 in.) |
| Rear track | 1570 mm (61.81 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, manual transmission |
| Front suspension | Double wishbone |
| Rear suspension | Spring Strut |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system), Hydraulic Steering |
| Tires size | 255/35 R20 |
INTRODUCTION
The Alpina Roadster V8 4.8i was produced from 2002 to 2006, building upon the BMW Z8’s foundation. Alpina took the Z8 and significantly enhanced it, focusing on engine performance and refinement. The Roadster V8 was positioned as a grand touring roadster, offering a more luxurious and powerful alternative to the standard Z8. It was a relatively low-volume production vehicle, adding to its exclusivity and collectibility. The car was built on the 1HX0 platform, shared with the BMW Z8.
Powertrain & Engine Architecture
At the heart of the Alpina Roadster V8 is a 4.8-liter naturally aspirated V8 engine, designated as the Alpina H8 engine. This engine is based on the BMW M62 V8 but extensively modified by Alpina. Key changes included a higher compression ratio (10.5:1), larger intake manifolds, and a revised engine management system. The engine produces 381 horsepower at 5,800 rpm and 520 Nm (383.53 lb-ft) of torque at 3,800 rpm. It utilizes a multi-port fuel injection system and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine’s longitudinal front-mid layout contributes to balanced weight distribution. The car was exclusively offered with a 5-speed manual transmission, a deliberate choice by Alpina to maintain a driver-focused experience. This transmission was reinforced to handle the increased power output.
Driving Characteristics
The Alpina Roadster V8 delivers a distinctly different driving experience compared to the standard BMW Z8. The increased power and torque, combined with the manual transmission, provide exhilarating acceleration. Zero to 60 mph is achieved in approximately 5.0 seconds, and the car has a top speed of 161.56 mph. The manual gearbox offers precise shifts and allows the driver to fully exploit the engine’s powerband. While the Z8 was known for its somewhat heavy feel, Alpina’s modifications, including suspension tuning, aimed to improve handling and responsiveness. The car feels planted and stable at high speeds, offering a confident and engaging driving experience. The gear ratios are optimized for both acceleration and comfortable cruising, making it suitable for long-distance journeys.
Equipment & Trim Levels
The Alpina Roadster V8 came exceptionally well-equipped as standard. Interior appointments included high-quality leather upholstery, Alpina-branded sport seats, and wood trim. Standard features also included automatic climate control, power-adjustable seats, and a premium sound system. Alpina offered a range of customization options, allowing buyers to personalize their vehicles. These options included different leather colors, bespoke interior trim, and upgraded audio systems. The exterior featured Alpina-specific aerodynamic enhancements, including a front spoiler and rear diffuser, as well as unique Alpina wheels. Each vehicle was individually numbered, further emphasizing its exclusivity.
Chassis & Braking
The chassis of the Alpina Roadster V8 is based on the BMW Z8’s aluminum space frame, providing a rigid and lightweight platform. Alpina made modifications to the suspension, including stiffer springs and dampers, to improve handling and reduce body roll. The front suspension utilizes a double wishbone design, while the rear features a spring strut setup. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. The car’s steering is hydraulically assisted, offering precise and responsive control.
Market Reception & Comparison
The Alpina Roadster V8 was generally well-received by automotive critics. Reviewers praised its powerful engine, refined handling, and luxurious interior. It was often compared to the standard BMW Z8, with the Alpina version being lauded for its increased performance and exclusivity. Fuel economy, while not a primary concern for buyers in this segment, was reasonable for a high-performance roadster, averaging around 25.3 US mpg combined. Reliability was generally good, benefiting from the robust BMW underpinnings and Alpina’s meticulous engineering. However, maintenance costs could be higher than those of the standard Z8 due to the specialized Alpina components.
Legacy
The Alpina Roadster V8 4.8i remains a highly desirable vehicle in the used car market. Its limited production run and unique character have made it a collector’s item. The powertrain, while not the most fuel-efficient, has proven to be relatively reliable with proper maintenance. The car’s combination of performance, luxury, and exclusivity continues to appeal to enthusiasts. Today, well-maintained examples command premium prices, reflecting their rarity and the enduring appeal of the Alpina brand. The Roadster V8 stands as a testament to Alpina’s ability to enhance and refine existing BMW models, creating truly special automobiles.
