2014-2016 BMW 4 Series Convertible (F33) 428i (245 Hp)

The BMW 4 Series Convertible (F33) 428i, produced from 2014 to 2016, represented a key offering in BMW’s mid-size luxury convertible lineup. Positioned as a blend of performance and open-air enjoyment, the 428i served as a popular choice for buyers seeking a more accessible entry point into the 4 Series range compared to the higher-performance 435i and 440i models. It was built on the F33 chassis, part of the broader F30 3 Series and F32 4 Series platform family, and aimed to deliver a refined driving experience with a focus on everyday usability.

Technical Specifications

INTRODUCTION

The BMW 428i Convertible, part of the F33 generation produced between 2014 and 2016, offered a compelling package for drivers seeking a premium open-top experience. It slotted into the 4 Series lineup below the more powerful 435i (later 440i), providing a balance of performance, luxury, and affordability. The F33 chassis itself was a significant evolution from the previous 3 Series Convertible (E93), boasting increased rigidity and improved handling characteristics. The 428i aimed to appeal to a broader audience, including those prioritizing fuel efficiency and a comfortable ride alongside the thrill of convertible motoring.

Powertrain & Engine Architecture

At the heart of the 428i lay BMW’s N20B20A 2.0-liter turbocharged inline-four cylinder engine. This engine was a cornerstone of BMW’s “EfficientDynamics” strategy, combining direct fuel injection, a twin-scroll turbocharger, and variable valve timing (VANOS) and valve lift (Valvetronic) technologies. The N20 engine produced 245 horsepower at 5,000-6,500 rpm and 258 lb-ft of torque from a remarkably low 1,250 rpm, sustaining peak torque all the way to 4,800 rpm. This broad torque curve contributed to strong acceleration and effortless cruising. The engine’s turbocharger was integrated into the exhaust manifold, reducing turbo lag and improving responsiveness. The 428i was typically paired with an 8-speed automatic transmission (ZF 8HP), known for its smooth shifts and efficiency. A 6-speed manual transmission was also available, though less common in the US market.

Driving Characteristics

The 428i Convertible, equipped with the 8-speed automatic, delivered a refined and engaging driving experience. The automatic transmission’s gear ratios were well-chosen, providing quick acceleration in everyday driving situations. While not as overtly sporty as the 435i, the 428i still offered ample power for confident overtaking and enjoyable backroad driving. The rear-wheel-drive configuration contributed to balanced handling, and the chassis’s rigidity minimized body roll. The steering was precise and well-weighted, providing good feedback to the driver. Compared to the manual transmission version, the automatic prioritized comfort and ease of use, making it ideal for daily commutes and long-distance journeys. The 0-60 mph time of around 6.1 seconds was respectable for a luxury convertible of its size and weight.

Equipment & Trim Levels

The 428i Convertible came standard with a generous array of features, including leatherette upholstery, automatic climate control, a power-operated retractable hardtop, and BMW’s iDrive infotainment system with a 6.5-inch display screen. Optional extras included leather upholstery, heated seats, a premium sound system (Harman Kardon), navigation, and a suite of driver-assistance features such as lane departure warning and blind-spot monitoring. Trim levels were relatively straightforward, with most customization occurring through individual options. The Sport Line package added exterior styling enhancements and sport seats, while the Luxury Line focused on a more opulent interior aesthetic. The M Sport package offered even more aggressive styling cues and a sport-tuned suspension.

Chassis & Braking

The F33 4 Series Convertible featured a sophisticated chassis design aimed at maximizing rigidity and handling performance. The front suspension utilized independent coil springs and struts, while the rear employed an independent multi-link setup. This configuration provided a comfortable ride while maintaining precise control. Brakes consisted of ventilated discs at all four corners, providing ample stopping power. Anti-lock braking system (ABS) and dynamic stability control (DSC) were standard features, enhancing safety and stability. The 428i’s weight distribution was nearly 50/50, contributing to balanced handling characteristics. The standard tire size was 225/50 R17, offering a good balance of grip and ride comfort.

Market Reception & Comparison

The 428i Convertible was generally well-received by automotive critics. It was praised for its refined driving experience, comfortable interior, and stylish design. However, some reviewers noted that the 2.0-liter engine, while capable, lacked the outright punch of the 3.0-liter inline-six found in the 435i. Fuel economy was a strong point, with the 428i achieving around 34.6 mpg in combined driving. Compared to the 435i, the 428i offered a more affordable entry point into the 4 Series Convertible range, making it attractive to a wider range of buyers. Maintenance costs were generally comparable to other BMW models, though the turbocharged engine required regular oil changes and careful attention to cooling system components.

Legacy

The BMW 428i Convertible (F33) has proven to be a relatively reliable vehicle in the used car market. The N20 engine, while not without its potential issues (such as oil leaks and timing chain wear), is generally durable when properly maintained. The 8-speed automatic transmission is known for its longevity. Today, the F33 428i Convertible represents a compelling value proposition for buyers seeking a stylish and enjoyable open-top experience. Its combination of performance, luxury, and fuel efficiency continues to make it a popular choice among enthusiasts and casual drivers alike. Well-maintained examples command reasonable prices, making it an accessible entry point into the world of BMW convertibles.