The Jaguar XJ Long R 5.0 V8 (X351 facelift) represents the pinnacle of performance within the XJ Long range, produced for the 2017 and 2018 model years. This variant, part of the X351 generation which debuted in 2009 and received a significant facelift in 2015, offered a luxurious and exceptionally powerful experience. The “R” designation signified Jaguar’s high-performance trim level, and the 5.0-liter supercharged V8 engine delivered substantial horsepower and torque. The XJ Long, as the name suggests, provided extended rear legroom, catering to buyers prioritizing rear passenger comfort. It competed directly with flagship sedans from BMW, Mercedes-Benz, and Audi, offering a unique blend of British luxury and sporting dynamics.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (X351 facelift 2015) |
| Type (Engine) | R 5.0 V8 (575 Hp) Automatic |
| Start of production | 2017 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (combined) | 11.1 l/100 km |
| Fuel consumption (US mpg) | 21.2 US mpg |
| Fuel consumption (UK mpg) | 25.4 UK mpg |
| Fuel consumption (km/l) | 9 km/l |
| CO2 emissions | 264 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.4 sec |
| Acceleration 0 – 62 mph | 4.4 sec |
| Acceleration 0 – 60 mph | 4.2 sec |
| Maximum speed | 300 km/h (186.41 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.3 kg/Hp, 305 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 371.4 Nm/tonne |
| Power | 575 Hp @ 6250-6500 rpm |
| Power per litre | 115 Hp/l |
| Torque | 700 Nm @ 3500-4500 rpm (516.29 lb.-ft. @ 3500-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 508PS |
| Engine displacement | 5000 cm3 (305.12 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92.5 mm (3.64 in.) |
| Piston Stroke | 93 mm (3.66 in.) |
| Compression ratio | 9.6:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Supercharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 7.25 l (7.66 US qt | 6.38 UK qt) |
| Coolant capacity | 8.6 l (9.09 US qt | 7.57 UK qt) |
| Kerb Weight | 1885 kg (4155.71 lbs.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 5255 mm (206.89 in.) |
| Width | 1899 mm (74.76 in.) |
| Width including mirrors | 2105 mm (82.87 in.) |
| Height | 1460 mm (57.48 in.) |
| Wheelbase | 3157 mm (124.29 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear track | 1604 mm (63.15 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 8 |
| Gearbox type | Automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Double wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
Powertrain & Engine Architecture
The heart of the XJ Long R was Jaguar’s 5.0-liter supercharged V8 engine, internally designated as the 508PS unit. This engine featured a roots-type supercharger, providing instant boost and a broad torque curve. Direct fuel injection, combined with variable valve timing on both intake and exhaust sides (DOHC), optimized fuel efficiency and power delivery. The engine produced 575 horsepower at 6,250-6,500 rpm and a substantial 700 Nm (516 lb-ft) of torque between 3,500 and 4,500 rpm. This power was channeled through an eight-speed automatic transmission, developed in partnership with ZF. The transmission offered smooth and rapid shifts, contributing to the car’s impressive acceleration. The engine was longitudinally mounted, driving the rear wheels.
Driving Characteristics
The XJ Long R delivered a truly exhilarating driving experience. The supercharged V8 provided effortless acceleration, with 0-60 mph achievable in around 4.2 seconds. The eight-speed automatic transmission was well-tuned, offering both responsive downshifts for overtaking and comfortable cruising at highway speeds. While the XJ Long’s increased weight (1885 kg) compared to the standard wheelbase XJ slightly dulled agility, the R’s powerful engine more than compensated. The suspension, tuned for a balance of comfort and control, provided a composed ride even over imperfect road surfaces. Compared to the XJ’s other engine options – including a 3.0-liter supercharged V6 and a 3.0-liter turbodiesel – the R offered a significantly more potent and engaging driving experience, albeit at the expense of fuel economy.
Equipment & Trim Levels
The XJ Long R came standard with a comprehensive array of luxury features. Interior appointments included premium leather upholstery, wood veneer trim, and heated and ventilated front and rear seats. Standard technology included a touchscreen infotainment system with navigation, a premium sound system, and a suite of driver-assistance features such as adaptive cruise control, lane departure warning, and blind-spot monitoring. Optional extras included a rear-seat entertainment system, massaging seats, and upgraded leather options. The XJ Long R represented the highest trim level, offering virtually every available option as standard or readily available.
Chassis & Braking
The XJ Long R utilized a lightweight aluminum chassis, contributing to its relatively low weight for a full-size luxury sedan. The suspension featured double wishbones at both the front and rear, providing a comfortable and controlled ride. Braking duties were handled by ventilated discs on all four wheels, providing ample stopping power. The car was equipped with ABS (Anti-lock Braking System) and electronic stability control as standard safety features. The steering system was a power-assisted rack and pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The XJ Long R was generally well-received by automotive critics, praised for its powerful engine, luxurious interior, and comfortable ride. However, some reviewers noted that its fuel economy was relatively poor compared to its competitors. Compared to the standard XJ Long models, the R offered a significant performance upgrade, but at a higher price point. Against rivals like the BMW 750i and Mercedes-Benz S550, the XJ Long R offered a unique blend of British style and sporting dynamics, appealing to buyers seeking an alternative to the German establishment.
Legacy
The Jaguar XJ Long R 5.0 V8 (X351) remains a desirable used car today, particularly for enthusiasts seeking a powerful and luxurious British sedan. The supercharged V8 engine is known for its reliability, although regular maintenance is essential. The eight-speed automatic transmission has also proven to be durable. While parts availability can be more challenging than for more common luxury cars, a dedicated network of Jaguar specialists ensures that these vehicles can be kept on the road. The XJ Long R represents a high point in Jaguar’s modern history, showcasing the brand’s commitment to performance, luxury, and style.
