The Citroën CX 25 D Turbo, specifically the Phase I variant produced from 1983 to 1985, represented a significant evolution in Citroën’s long history of innovative automotive engineering. Positioned as a premium offering within the CX range, the 25 D Turbo aimed to provide a blend of luxury, performance, and fuel efficiency, appealing to buyers seeking a sophisticated and comfortable grand touring experience. It was a key model within the first generation (Series I) of the CX, denoted by the chassis codes 1HX0 and A3, and built upon the technological foundations laid by its predecessor, the Citroën DS. This variant, with its turbocharged diesel engine, offered a compelling alternative to gasoline-powered models, particularly in European markets where diesel fuel was becoming increasingly popular.
Technical Specifications
| Brand | Citroën |
| Model | CX |
| Generation | CX I (Phase I, 1982) |
| Type (Engine) | Limousine 25 D Turbo (95 Hp) |
| Start of production | 1983 |
| End of production | 1985 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 13.7 sec |
| Acceleration 0 – 62 mph | 13.7 sec |
| Acceleration 0 – 60 mph | 13 sec |
| Maximum speed | 174 km/h (108.12 mph) |
| Weight-to-power ratio | 15.3 kg/Hp, 65.5 Hp/tonne |
| Weight-to-torque ratio | 6.7 kg/Nm, 149 Nm/tonne |
| Power | 95 Hp @ 3700 rpm |
| Power per litre | 38 Hp/l |
| Torque | 216 Nm @ 2000 rpm (159.31 lb.-ft. @ 2000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | M25-648 |
| Engine displacement | 2499 cm3 (152.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 21:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Precombustion chamber injection |
| Engine aspiration | Turbocharger |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Coolant | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 1450 kg (3196.7 lbs.) |
| Max. weight | 1920 kg (4232.88 lbs.) |
| Max load | 470 kg (1036.17 lbs.) |
| Trunk (boot) space – minimum | 325 l (11.48 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 UK gal) |
| Length | 4916 mm (193.54 in.) |
| Width | 1770 mm (69.69 in.) |
| Height | 1375 mm (54.13 in.) |
| Wheelbase | 3095 mm (121.85 in.) |
| Front track | 1522 mm (59.92 in.) |
| Rear (Back) track | 1368 mm (53.86 in.) |
| Front overhang | 1057 mm (41.61 in.) |
| Rear overhang | 764 mm (30.08 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle | 13.4 m (43.96 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 | 5 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Steering rack and pinion |
Powertrain & Engine Architecture
The heart of the CX 25 D Turbo was the M25-648 engine, a 2.5-liter inline-four diesel. This engine utilized precombustion chamber injection, a system common in European diesel engines of the era, which improved combustion efficiency and reduced engine noise compared to direct injection systems. The addition of a turbocharger significantly boosted power output to 95 horsepower at 3700 rpm and 216 Nm (159.31 lb-ft) of torque at 2000 rpm. This was a substantial increase over the naturally aspirated diesel versions of the CX. The engine was transversely mounted, contributing to the car’s front-wheel-drive layout. The five-speed manual transmission was the standard offering, providing a good balance between performance and fuel economy. The gearbox was designed to handle the increased torque output of the turbocharged diesel.
Driving Characteristics
The CX 25 D Turbo offered a unique driving experience. While not a sports car, the turbocharger provided a noticeable surge of power, improving acceleration compared to the non-turbo diesel models. The 0-60 mph time of around 13 seconds was respectable for the early 1980s, and the car could achieve a top speed of 108 mph. The hydropneumatic suspension, a Citroën hallmark, provided an exceptionally smooth and comfortable ride, absorbing bumps and imperfections in the road with ease. However, the suspension also contributed to a somewhat detached feel, and the steering, while precise, lacked significant feedback. The five-speed manual transmission allowed drivers to keep the engine in its optimal power band, maximizing performance. The gear ratios were well-chosen for both highway cruising and spirited driving.
Equipment & Trim Levels
The CX 25 D Turbo was generally well-equipped, reflecting its position as a premium model. Standard features included comfortable cloth upholstery, power steering, and a comprehensive instrument panel. Optional extras included leather upholstery, air conditioning, and a sunroof. The interior design was typically Citroën – functional, modern, and focused on driver comfort. The dashboard layout was clean and straightforward, with all essential controls within easy reach. The CX also featured Citroën’s distinctive single-spoke steering wheel.
Chassis & Braking
The CX utilized a robust chassis with independent suspension on all four wheels, utilizing Citroën’s innovative hydropneumatic system. This system not only provided a comfortable ride but also allowed the car to maintain a constant ride height regardless of load. The front brakes were ventilated discs, providing ample stopping power, while the rear brakes were solid discs. The steering was a rack-and-pinion system, offering precise control. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The CX 25 D Turbo was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and fuel efficiency. However, some critics noted the car’s somewhat unconventional styling and the complexity of its hydropneumatic suspension. Compared to the naturally aspirated diesel CX models, the 25 D Turbo offered a significant performance improvement. It also provided a more economical alternative to the gasoline-powered CX variants. Against competitors like the Peugeot 505 and the Mercedes-Benz W123, the CX offered a unique blend of comfort, technology, and value.
Legacy
The Citroën CX 25 D Turbo, while not produced in massive numbers, has gained a loyal following among enthusiasts. The M25-648 engine, when properly maintained, proved to be a durable and reliable unit. However, the hydropneumatic suspension requires regular attention and can be expensive to repair. Today, well-maintained examples of the CX 25 D Turbo are sought after by collectors and classic car enthusiasts who appreciate its unique engineering and distinctive character. The car represents a high point in Citroën’s history of innovation and remains a testament to the company’s commitment to providing a truly exceptional driving experience.
