The Citroen C4 Coupe 1.6 THP 16V (150 hp) represents a compelling blend of style and performance within the first generation (C4 I) of Citroen’s compact offering. Introduced as part of the Phase II refresh in 2008 and continuing through 2010, this variant aimed to provide a more engaging driving experience than the base models, while remaining accessible to a broad customer base. Positioned as a mid-range option, it slotted between the lower-powered petrol engines and the more expensive diesel variants. The C4 Coupe, with its three-door body style, targeted a younger, more style-conscious buyer than the five-door hatchback version. It was primarily sold in the European market, where compact coupes enjoyed significant popularity.
Technical Specifications
| Brand | Citroen |
| Model | C4 |
| Generation | C4 I Coupe (Phase II, 2008) |
| Type (Engine) | 1.6 THP 16V (150 Hp) |
| Start of production | 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel consumption (extra urban) | 5.3 l/100 km (44.4 US mpg, 53.3 UK mpg, 18.9 km/l) |
| Fuel consumption (combined) | 6.9 l/100 km (34.1 US mpg, 40.9 UK mpg, 14.5 km/l) |
| CO2 emissions | 164 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.4 sec |
| Acceleration 0 – 62 mph | 8.4 sec |
| Acceleration 0 – 60 mph | 8 sec |
| Maximum speed | 211 km/h (131.11 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8.5 kg/Hp, 118 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 188.8 Nm/tonne |
| Power | 150 Hp @ 5800 rpm |
| Power per litre | 93.9 Hp/l |
| Torque | 240 Nm @ 1400 rpm (177.01 lb.-ft. @ 1400 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | 5FX EP6DT |
| Engine displacement | 1598 cm3 (97.52 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 77 mm (3.03 in.) |
| Piston Stroke | 85.8 mm (3.38 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.25 l (4.49 US qt | 3.74 UK qt) |
| Coolant | 6.2 l (6.55 US qt | 5.46 UK qt) |
| Kerb Weight | 1271 kg (2802.08 lbs.) |
| Max. weight | 1754 kg (3866.91 lbs.) |
| Max load | 483 kg (1064.83 lbs.) |
| Trunk (boot) space – minimum | 314 l (11.09 cu. ft.) |
| Trunk (boot) space – maximum | 1083 l (38.25 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load with brakes (12%) | 1400 kg (3086.47 lbs.) |
| Permitted trailer load without brakes | 645 kg (1421.98 lbs.) |
| Permitted towbar download | 70 kg (154.32 lbs.) |
| Length | 4288 mm (168.82 in.) |
| Width | 1769 mm (69.65 in.) |
| Width including mirrors | 1964 mm (77.32 in.) |
| Height | 1456 mm (57.32 in.) |
| Wheelbase | 2608 mm (102.68 in.) |
| Front track | 1497 mm (58.94 in.) |
| Rear (Back) track | 1502 mm (59.13 in.) |
| Front overhang | 950 mm (37.4 in.) |
| Rear overhang | 730 mm (28.74 in.) |
| Minimum turning circle | 11.3 m (37.07 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Semi-independent, coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/50 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The Citroen C4 Coupe 1.6 THP 16V (150 hp), produced between 2008 and 2010, was a key variant within the C4 I Coupe range. This model benefited from the Phase II updates, which included cosmetic refinements and, crucially, the introduction of the Prince engine family – a collaborative effort between PSA Peugeot Citroën and BMW. The 1.6 THP engine, a turbocharged direct-injection unit, offered a significant performance upgrade over the naturally aspirated engines previously available in the C4 lineup. Built on the PSA Group’s Platform 2 (also known as the 1HX0/A3 platform), the C4 Coupe aimed to provide a stylish and practical alternative to traditional hatchbacks, appealing to buyers seeking a more individualistic vehicle.
Powertrain & Engine Architecture
At the heart of this C4 Coupe variant lies the 5FX (EP6DT) 1.6-liter turbocharged petrol engine. This engine is part of the Prince family, known for its compact size, lightweight construction, and impressive power output. The engine utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and performance. A twin-scroll turbocharger, coupled with an intercooler, minimizes turbo lag and maximizes boost pressure. The engine features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing gas flow and contributing to its high specific output. The 150 hp version of the 1.6 THP typically came paired with a 6-speed manual transmission, although an automatic option was also available, albeit less common. The automatic transmission, a conventional torque converter type, was chosen for its smoothness and ease of use, catering to drivers prioritizing comfort over outright performance.
Driving Characteristics
The 1.6 THP 16V engine transformed the driving experience of the C4 Coupe. With 150 hp and 240 Nm (177 lb-ft) of torque, the car offered brisk acceleration, achieving 0-100 km/h (0-62 mph) in around 8.4 seconds. The turbocharger provides a noticeable surge of power from around 1400 rpm, making it responsive in everyday driving situations. Compared to the lower-powered 1.4-liter petrol engine, the 1.6 THP felt significantly more capable, particularly when overtaking or climbing hills. While not as sporty as the later, more powerful THP variants, the 150 hp version struck a good balance between performance and fuel economy. The 6-speed manual transmission offered precise shifts, while the automatic, though less engaging, provided a comfortable and convenient driving experience. The gear ratios were tuned to prioritize mid-range acceleration, making it well-suited for typical European roads.
Equipment & Trim Levels
The 1.6 THP 16V C4 Coupe typically came equipped with a reasonable level of standard features. These included air conditioning, electric front windows, a CD stereo system, and ABS brakes. Higher trim levels, such as the Exclusive, added features like alloy wheels, automatic headlights and wipers, rear parking sensors, and a more sophisticated audio system. Interior upholstery was generally cloth, although leather options were available. The dashboard layout was functional and modern for its time, with a clear instrument cluster and logically arranged controls. Optional extras included a panoramic sunroof, satellite navigation, and a premium sound system.
Chassis & Braking
The C4 Coupe’s chassis featured independent front suspension with McPherson struts and a coil spring and anti-roll bar, providing a comfortable ride and decent handling. The rear suspension utilized a semi-independent torsion beam setup, which was a cost-effective solution that offered a good compromise between ride quality and handling. Braking duties were handled by ventilated discs at the front and solid discs at the rear, providing adequate stopping power. ABS (Anti-lock Braking System) was standard, enhancing safety in emergency braking situations. The steering was a rack and pinion system, offering precise and responsive control.
Market Reception & Comparison
The Citroen C4 Coupe 1.6 THP 16V was generally well-received by automotive critics. It was praised for its stylish design, comfortable ride, and the punchy performance of the 1.6 THP engine. Compared to the base petrol engines, the 1.6 THP offered a significant improvement in performance without a substantial penalty in fuel economy. However, some critics noted that the automatic transmission could feel a little sluggish at times. Compared to the diesel variants, the 1.6 THP offered a more refined driving experience but lacked the superior fuel economy of the diesel engines. The 1.6 THP also represented a more affordable alternative to the higher-powered THP models, making it an attractive option for buyers seeking a balance of performance and value.
Legacy
The 1.6 THP engine, despite some early issues with carbon buildup (particularly in models driven primarily on short journeys), proved to be a relatively reliable unit when properly maintained. The C4 Coupe 1.6 THP 16V remains a popular choice in the used car market, offering a stylish and affordable way to experience the benefits of a turbocharged engine. Regular oil changes and the occasional use of fuel system cleaner can help prevent carbon buildup and ensure long-term reliability. Today, these cars represent a good value proposition for buyers seeking a distinctive and enjoyable driving experience.
