Smart Roadster coupe 1.4 i V6 (170 Hp)

The Smart Roadster coupe 1.4 i V6, produced between 2003 and 2005, represented the performance pinnacle of the first-generation Smart Roadster (C450) platform. This variant, distinguished by its mid-mounted, naturally aspirated V6 engine, offered a significantly different driving experience compared to the more common three-cylinder models. Positioned as the premium offering within the Roadster lineup, it catered to enthusiasts seeking a unique and engaging sports car experience in a diminutive package. The Roadster itself was a collaborative effort between Smart and McLaren, aiming to deliver a fun-to-drive, compact roadster.

Powertrain & Engine Architecture

The heart of the Smart Roadster coupe 1.4 i V6 is its 1396 cc (85.19 cu. in.) V6 engine, internally designated as the M139. This engine, while compact, produced a substantial 170 hp at 5500 rpm and 220 Nm (162.26 lb-ft) of torque at 2250 rpm. This resulted in a specific output of 121.8 hp per liter. The engine featured a 9:1 compression ratio and utilized a multi-port fuel injection system. The valvetrain employed two valves per cylinder. Unlike some contemporary engines, the M139 did *not* feature forced induction; its power came from careful design and efficient breathing. The engine was transversely mounted in the rear of the vehicle, contributing to the Roadster’s unique handling characteristics. The engine’s compact size and rear-mid engine layout were key to the car’s low polar moment of inertia, enhancing agility.

Transmission

The 1.4 i V6 was exclusively paired with a 5-speed manual transmission. An automatic transmission was not offered with this engine. The gearbox was chosen to handle the increased power output of the V6 and provide a direct connection to the rear wheels. The gear ratios were tuned to maximize acceleration, with a relatively short final drive to take advantage of the engine’s torque. The shift linkage was precise, contributing to the sporty feel of the car.

Driving Characteristics

The Smart Roadster coupe 1.4 i V6 offered a markedly different driving experience than its three-cylinder siblings. The V6 provided a smooth and linear power delivery, with a willingness to rev freely. Acceleration was brisk, with 0-60 mph times quoted around 5.7 seconds and a top speed of 220 km/h (136.7 mph). The rear-wheel-drive layout and mid-engine placement resulted in neutral handling characteristics, with a tendency towards oversteer if pushed hard. This made the car engaging and rewarding for experienced drivers. Compared to the 0.8 or 0.7-liter three-cylinder models, the V6 offered significantly more power and torque throughout the rev range, making it much more capable on winding roads and during highway overtaking. The increased weight of the V6 engine, however, did slightly diminish the overall agility compared to the lighter three-cylinder versions.

Equipment & Trim Levels

The 1.4 i V6 Roadster coupe was generally well-equipped, reflecting its position as the range-topping model. Standard features included sports seats, leather upholstery, alloy wheels, and an upgraded audio system. Air conditioning was typically standard. The interior featured a minimalist design, focusing on functionality and driver engagement. Optional extras included a panoramic roof, upgraded sound systems, and various cosmetic enhancements. The dashboard layout was consistent across the Roadster range, but the V6 model often featured unique trim accents to differentiate it from the lower-spec versions. The interior, while compact, was surprisingly comfortable for two occupants.

Chassis & Braking

The Smart Roadster utilized a space frame chassis constructed from high-strength steel. The suspension consisted of a spring strut setup at the front and a De-Dion rear axle. The De-Dion setup helped to isolate the cabin from road imperfections and contributed to the car’s stable handling. The V6 model featured upgraded brakes compared to the three-cylinder versions, with ventilated discs at all four corners. Anti-lock Braking System (ABS) was standard. The steering was a hydraulic rack and pinion system, providing precise and responsive control. The car rode on 205/40 R17 tires, which provided good grip and contributed to the sporty handling characteristics. Stabilizer bars were fitted front and rear to reduce body roll during cornering.

Market Reception & Comparison

The Smart Roadster coupe 1.4 i V6 received generally positive reviews from automotive critics. It was praised for its unique driving experience, engaging handling, and powerful engine. However, some critics noted the car’s limited practicality and relatively high price compared to other small sports cars. Compared to the three-cylinder Roadsters, the V6 offered a significant performance upgrade but came at a higher cost and with slightly reduced fuel economy. Fuel economy figures were around 30-35 mpg combined. Reliability was generally good, although the complex V6 engine required more diligent maintenance than the simpler three-cylinder units. The V6 model appealed to a niche market of enthusiasts who appreciated its unique character and performance.

Technical Specifications

Legacy

The Smart Roadster coupe 1.4 i V6 remains a sought-after model among Smart enthusiasts. Its unique combination of a powerful V6 engine, rear-wheel drive, and compact dimensions makes it a distinctive and engaging sports car. While the Smart Roadster platform as a whole suffered from some reliability issues, the V6 engine itself has proven to be relatively robust when properly maintained. Parts availability can be a challenge, as production ceased nearly two decades ago. However, a dedicated community of owners and specialists exists to support the car. On the used car market, the 1.4 i V6 commands a premium price compared to the three-cylinder models, reflecting its rarity and desirability. It is often viewed as a collector’s item and a testament to Smart’s ambition to create a truly unique and fun-to-drive sports car.