2003-2006 Alpina Roadster S 3.3 i 24V (300 Hp)

The Alpina Roadster S 3.3 i 24V, produced between 2003 and 2006, represents a unique collaboration between BMW and the independent German automotive engineering firm, Alpina. Based on the BMW Z8 platform (E52), the Roadster S was Alpina’s interpretation of a high-performance, open-top grand tourer. It aimed to deliver a more refined and powerful experience than the standard Z8, appealing to drivers seeking exclusivity and a blend of luxury and performance. The Roadster S occupied the top-tier position within the Z8-based Alpina lineup, offering a significant step up in both power and price compared to other variants.

Technical Specifications

INTRODUCTION

The Alpina Roadster S 3.3 i 24V was a limited-production, high-performance roadster built upon the BMW Z8 chassis. Alpina, known for its meticulous engine tuning and luxurious appointments, took the already capable Z8 and elevated it to a new level of refinement and power. Production ran from 2003 to 2006, with a relatively small number of units produced, making it a highly sought-after vehicle among collectors and enthusiasts. The Roadster S represented Alpina’s commitment to creating driver-focused automobiles with a distinct character, setting it apart from standard BMW offerings.

Powertrain & Engine Architecture

At the heart of the Roadster S lies a modified version of BMW’s M62B36 inline-six engine. Alpina extensively reworked the engine, increasing its displacement to 3.3 liters and employing a higher compression ratio of 10.2:1. The engine featured a dual-VANOS variable valve timing system, optimized for both low-end torque and high-rpm power. Alpina’s engineers also refined the engine management system and exhaust system to extract an impressive 300 horsepower at 6300 rpm and 362 Nm (267 lb-ft) of torque at 4800 rpm. The engine utilized multi-port fuel injection for precise fuel delivery. The Roadster S was exclusively offered with a 5-speed manual transmission, chosen for its direct connection to the engine and enhanced driving experience. This transmission was specifically tuned to handle the increased power output and provide smooth, precise shifts.

Driving Characteristics

The Alpina Roadster S delivered a driving experience that was both exhilarating and refined. The 3.3-liter inline-six provided strong acceleration, with a 0-60 mph time of around 5 seconds and a top speed of 164.66 mph. The manual transmission allowed for complete control over the engine’s power, while the well-tuned suspension provided a comfortable yet sporty ride. Compared to the standard Z8, the Roadster S felt noticeably more responsive and powerful. The increased torque made it easier to accelerate from low speeds, and the higher horsepower allowed for effortless cruising at highway speeds. The gear ratios were optimized for both acceleration and fuel efficiency, providing a balance between performance and practicality. While not as raw or track-focused as some other sports cars, the Roadster S offered a uniquely engaging and enjoyable driving experience.

Equipment & Trim Levels

The Alpina Roadster S was generously equipped with luxury features as standard. The interior featured high-quality leather upholstery, available in a range of colors, and wood trim accents. Standard equipment included power-adjustable seats, automatic climate control, a premium sound system, and a power-operated soft top. Alpina also offered a range of bespoke options, allowing customers to personalize their vehicles to their exact specifications. These options included custom leather colors, unique wood trim choices, and upgraded audio systems. The instrument cluster featured Alpina-specific gauges and badging, further distinguishing the Roadster S from the standard Z8.

Chassis & Braking

The Roadster S retained the Z8’s aluminum space frame chassis, providing a rigid and lightweight platform. Alpina made subtle modifications to the suspension to improve handling and ride comfort. The front suspension utilized spring struts, while the rear suspension featured a double wishbone design. Braking duties were handled by ventilated disc brakes on all four wheels, equipped with ABS (Anti-lock Braking System) for enhanced safety. The Roadster S’s braking system provided ample stopping power, even under demanding driving conditions. The car’s relatively low weight and balanced chassis contributed to its agile handling characteristics.

Market Reception & Comparison

The Alpina Roadster S was well-received by automotive critics, who praised its blend of performance, luxury, and exclusivity. Reviewers noted the engine’s smooth power delivery and the car’s refined driving experience. Compared to the standard BMW Z8, the Roadster S was seen as a more focused and engaging sports car. While the Z8 offered a wider range of engine options, including a V8, the Alpina’s 3.3-liter inline-six was considered by many to be the sweet spot in the lineup. Fuel economy was reasonable for a high-performance roadster, with combined fuel consumption figures around 11.5 l/100 km. Reliability was generally good, although maintenance costs were higher than those of the standard Z8 due to the Alpina’s specialized components.

Legacy

The Alpina Roadster S 3.3 i 24V remains a highly desirable vehicle in the used car market today. Its limited production numbers and unique character have made it a collector’s item. The engine is known for its durability and relatively straightforward maintenance, although sourcing parts can sometimes be challenging. The Roadster S represents a high point in Alpina’s history, showcasing the company’s ability to create exceptional automobiles that blend performance, luxury, and exclusivity. It continues to be appreciated by enthusiasts who value its distinctive character and engaging driving experience.