The sixth generation of the iconic Ford Mustang, internally designated S550, marked a pivotal moment in the history of the legendary American pony car. Launched for the 2015 model year, this iteration was the first Mustang designed from the ground up to be a global vehicle, officially sold in markets around the world, including right-hand drive variants. This article focuses on a particularly desirable variant from its initial production run: the Ford Mustang Convertible VI GT 5.0 Ti-VCT V8 (421 Hp) Automatic. Produced between 2015 and 2017, this model combined the visceral thrill of a naturally aspirated V8 engine with the open-air experience of a convertible, delivering a compelling blend of performance, style, and heritage that resonated deeply with automotive enthusiasts globally. It represented a significant leap forward in refinement and technology for the Mustang nameplate while staying true to its muscle car roots.
Powertrain & Engine Architecture
At the heart of the Ford Mustang Convertible VI GT 5.0 Ti-VCT V8 (421 Hp) Automatic lies the revered “Coyote” V8 engine, a powerplant synonymous with modern Mustang performance. This naturally aspirated 4.95-liter (302.13 cubic inches) unit, designated with the engine code Coyote, is a testament to traditional American V8 engineering combined with modern technological advancements. It features a DOHC (Dual Overhead Camshaft) valvetrain with four valves per cylinder, ensuring efficient airflow and high-revving capability. The Ti-VCT (Twin Independent Variable Camshaft Timing) system further optimizes valve overlap for improved power delivery across the rev range and enhanced fuel efficiency.
In this specific configuration, the Coyote V8 generates a robust 421 horsepower at 6500 rpm, providing exhilarating acceleration and a thrilling soundtrack. Torque output is equally impressive, peaking at 390.91 lb.-ft. (530 Nm) at a relatively accessible 4250 rpm, ensuring strong pull from low speeds and effortless highway cruising. Power is transmitted to the rear wheels via a smooth and responsive 6-speed automatic transmission, a popular choice that balances performance with everyday drivability, allowing for quick shifts and comfortable long-distance travel. This transmission, a Ford-developed unit, features a torque converter lock-up clutch for improved efficiency at cruising speeds. The gear ratios are tuned to provide a balance between acceleration and fuel economy, with a final drive ratio typically around 3.55:1.
Despite its substantial power, the Mustang GT Convertible maintains a respectable weight-to-power ratio of 4.3 kg per horsepower (234.9 Hp per tonne) and a weight-to-torque ratio of 3.4 kg per Newton-meter (295.8 Nm per tonne), indicative of its strong performance characteristics. Fuel economy for the combined cycle is rated at 18.4 US mpg (12.8 l/100 km), with CO2 emissions of 289 g/km, figures typical for a high-performance V8 convertible of this era. The engine’s multi-port manifold injection system ensures precise fuel delivery, contributing to both performance and efficiency. Its impressive power per liter of 85 Hp/l highlights the engineering prowess behind this iconic engine.
Driving Characteristics
The 2015-2017 Mustang GT Convertible with the 5.0L V8 and automatic transmission delivers a driving experience that blends raw power with relative ease of use. Compared to the available manual transmission, the automatic offers smoother shifts and reduces driver fatigue, particularly in stop-and-go traffic. However, it does sacrifice some of the direct control and engagement offered by a manual gearbox. The automatic transmission features paddle shifters, allowing drivers to manually select gears when desired, providing a degree of control for spirited driving.
Acceleration is brisk, with 0-60 mph times typically around 4.6-4.8 seconds, depending on testing conditions and options. The engine’s torque curve provides strong acceleration throughout the rev range, making it a responsive and enjoyable car to drive in various situations. The independent rear suspension significantly improves handling compared to previous Mustang generations, reducing body roll and providing a more planted feel in corners. While not as track-focused as the manual transmission-equipped models or the later Performance Pack options, the automatic GT Convertible offers a comfortable and capable driving experience for both daily commuting and weekend fun.
Equipment & Trim Levels
The Ford Mustang Convertible VI GT 5.0 Ti-VCT V8 (421 Hp) Automatic typically came well-equipped, positioning it as a mid-to-upper trim level within the sixth-generation Mustang lineup. Standard features included leather upholstery, air conditioning, a six-speaker audio system, and power-adjustable seats. The convertible top was power-operated and featured a glass rear window. Infotainment was handled by Ford’s SYNC system, offering Bluetooth connectivity, USB ports, and voice control.
Optional extras were plentiful, allowing buyers to customize their Mustang to their preferences. Popular options included the Premium Package, which added upgraded leather, heated and cooled front seats, and a premium audio system. Other options included navigation, blind-spot monitoring, rear cross-traffic alert, and a performance exhaust system. Exterior options included various wheel designs, paint colors, and stripe packages. Interior color choices typically included black, gray, and saddle brown.
Chassis & Braking
The sixth-generation Mustang Convertible benefited from a significant chassis upgrade with the adoption of an independent rear suspension (IRS). This replaced the solid rear axle used in previous generations, dramatically improving ride quality and handling. The IRS utilizes a multi-link design with coil springs and stabilizer bar. The front suspension employs an independent McPherson strut setup with coil springs and a stabilizer bar.
Braking duties are handled by ventilated disc brakes at all four corners, providing ample stopping power. The system is equipped with an Anti-lock Braking System (ABS) and Electronic Stability Control (ESC) for enhanced safety. The steering system is a responsive rack-and-pinion type with electric power steering. The Mustang GT Convertible typically rode on 19-inch alloy wheels, with staggered tire sizes – 255/40R19 at the front and 275/40R19 at the rear – to maximize grip. The rear brakes were typically larger than those found on the EcoBoost models, reflecting the increased power of the V8 engine.
Market Reception & Comparison
Critics generally praised the 2015-2017 Mustang GT Convertible for its combination of performance, style, and improved refinement. The Coyote V8 engine received widespread acclaim for its power and sound, while the IRS was lauded for its positive impact on handling and ride quality. The automatic transmission was considered a good compromise between performance and convenience.
Compared to other trims in the Mustang lineup, the GT Convertible offered a significant performance upgrade over the EcoBoost models, but at a higher price point. The GT’s fuel economy was lower than the EcoBoost, reflecting the V8’s larger displacement and increased power output. Compared to the Chevrolet Camaro Convertible and Dodge Challenger, the Mustang GT Convertible offered a balanced package, with a blend of performance, handling, and styling that appealed to a wide range of buyers. The Mustang’s global availability also gave it an advantage over its domestic rivals in certain markets.
Technical Specifications
| Category | Specification |
| General Information | |
| Brand | Ford |
| Model | Mustang |
| Generation | Mustang Convertible VI |
| Type (Engine) | GT 5.0 Ti-VCT V8 (421 Hp) Automatic |
| Production Start | 2015 |
| Production End | 2017 |
| Powertrain Architecture | Internal Combustion Engine |
| Body Type | Cabriolet (Convertible) |
| Seats | 4 |
| Doors | 2 |
| Performance Specs | |
| Fuel Consumption (Combined) | 18.4 US mpg (12.8 l/100 km) |
| CO2 Emissions | 289 g/km |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-Power Ratio | 4.3 kg/Hp (234.9 Hp/tonne) |
| Weight-to-Torque Ratio | 3.4 kg/Nm (295.8 Nm/tonne) |
| Engine Specs | |
| Power | 421 Hp @ 6500 rpm |
| Power per Liter | 85 Hp/l |
| Torque | 390.91 lb.-ft. @ 4250 rpm (530 Nm @ 4250 rpm) |
| Engine Layout | Front, Longitudinal |
| Engine Model/Code | Coyote |
| Engine Displacement | 4.951 liters (4951 cm3 / 302.13 cu. in.) |
| Number of Cylinders | 8 |
| Engine Configuration | V-engine |
| Cylinder Bore | 3.63 in. (92.2 mm) |
| Piston Stroke | 3.65 in. (92.7 mm) |
| Compression Ratio | 11:1 |
| Valves per Cylinder | 4 |
| Fuel Injection System | Multi-port manifold injection |
| Engine Aspiration | Naturally aspirated |
| Valvetrain | DOHC |
| Engine Oil Capacity | 8.03 US qt (7.6 l) |
| Engine Oil Specification | Data unavailable |
| Coolant Capacity | 13.61 US qt (12.88 l) |
| Space, Volume, and Weights | |
| Kerb Weight | 3950.68 lbs. (1792 kg) |
| Trunk (Boot) Space – Minimum | 11.72 cu. ft. (332 l) |
| Fuel Tank Capacity | 16.11 US gal (61 l) |
| Dimensions | |
| Length | 188.35 in. (4784 mm) |
| Width | 75.43 in. (1916 mm) |
| Width with Mirrors Folded | 77.01 in. (1956 mm) |
| Width Including Mirrors | 81.89 in. (2080 mm) |
| Height | 54.88 in. (1394 mm) |
| Wheelbase | 107.09 in. (2720 mm) |
| Front Track | 62.28 in. (1582 mm) |
| Rear Track | 65.16 in. (1655 mm) |
| Minimum Turning Circle | 40.03 ft. (12.2 m) |
| Drivetrain, Brakes, and Suspension | |
| Drivetrain Architecture | Internal Combustion Engine (ICE) drives the rear wheels. |
| Drive Wheel | Rear-wheel drive |
| Number of Gears and Type | 6 gears, automatic transmission |
| Front Suspension | Independent type McPherson |
| Rear Suspension | Independent multi-link spring suspension with stabilizer |
| Front Brakes | Ventilated discs |
| Rear Brakes | Ventilated discs |
| Assisting Systems | ABS (Anti-lock braking system) |
| Steering Type | Steering rack and pinion |
| Tires Size | Front: 255/40 R19; Rear: 275/40 R19 |
| Wheel Rims Size | 19 inches |
Legacy
The 2015-2017 Ford Mustang GT Convertible with the 5.0-liter V8 and automatic transmission has proven to be a reliable and desirable vehicle in the used car market. The Coyote V8 engine is known for its durability and relatively low maintenance requirements, provided it is properly maintained with regular oil changes and tune-ups. The 6-speed automatic transmission is also generally considered reliable. Common issues reported by owners include minor electrical glitches and wear items such as brakes and tires.
Its enduring appeal stems from its combination of performance, style, and open-air enjoyment. It represents a sweet spot in the sixth-generation Mustang’s history, offering a significant upgrade over previous generations while retaining the classic Mustang character. As a result, well-maintained examples continue to command strong prices in the used car market, making it a popular choice for enthusiasts seeking a modern American muscle car with a touch of timeless appeal.
