The Jaguar XJ Long (X351 facelift) R 5.0 V8 Automatic, produced from 2015 to 2017, represents the pinnacle of performance and luxury within the X351 generation of Jaguar’s flagship sedan. This long-wheelbase variant, distinguished by its increased rear passenger space, was positioned as the ultra-premium offering in the XJ lineup. The “R” designation signified the highest performance trim level, powered by a supercharged 5.0-liter V8 engine. It competed directly with other high-end luxury sedans such as the BMW 7 Series, Mercedes-Benz S-Class, and Audi A8, offering a unique blend of British styling, dynamic handling, and opulent comfort.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (X351 facelift 2015) |
| Type (Engine) | R 5.0 V8 (550 Hp) Automatic |
| Start of production | 2015 |
| End of production | 2017 |
| 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 | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 280 km/h (173.98 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 3.4 kg/Hp |
| Weight-to-torque ratio | 2.8 kg/Nm |
| Power | 550 Hp @ 6000-6500 rpm |
| Power per litre | 110 Hp/l |
| Torque | 680 Nm @ 3500-4000 rpm (501.54 lb.-ft. @ 3500-4000 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 | 9.5:1 |
| 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
At the heart of the XJ R is Jaguar’s 5.0-liter supercharged V8 engine, internally designated as the 508PS unit. This engine utilizes a Roots-type supercharger, providing instant boost and a broad torque curve. Direct fuel injection, combined with variable valve timing (VVT) on both intake and exhaust valves, optimizes combustion efficiency and power delivery. The engine produces 550 horsepower at 6000-6500 rpm and a substantial 680 Nm (501.54 lb-ft) of torque between 3500 and 4000 rpm. This power is channeled through an eight-speed automatic transmission, developed in partnership with ZF. The transmission features a sophisticated control system that adapts to driving conditions and driver input, providing smooth and responsive gear changes. The longitudinal engine layout and rear-wheel drive configuration contribute to the car’s balanced handling characteristics.
Driving Characteristics
The combination of the supercharged V8 and the eight-speed automatic transmission delivers exhilarating performance. The XJ R accelerates from 0 to 60 mph in approximately 4.4 seconds, and reaches a top speed of 174 mph. The automatic transmission is programmed for both comfort and performance, offering a manual mode for greater driver control. While not as overtly sporty as some of its rivals, the XJ R provides a refined and engaging driving experience. The long wheelbase contributes to a comfortable ride, while the sophisticated suspension system minimizes body roll during cornering. Compared to the standard XJ models with the 3.0-liter V6 engine, the R offers a significant performance upgrade, with noticeably quicker acceleration and a more authoritative feel. The supercharged V8 also delivers a distinctive exhaust note, adding to the car’s character.
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, blind-spot monitoring, and lane-keeping assist. Optional extras included a rear-seat entertainment system, massaging seats, and a panoramic sunroof. The long-wheelbase configuration provided ample rear legroom, making it particularly appealing to chauffeur-driven buyers. The R trim also featured unique exterior styling cues, such as a distinctive grille and alloy wheel design.
Chassis & Braking
The XJ Long R utilizes a lightweight aluminum chassis, contributing to its relatively low curb weight of 4155.71 lbs. The suspension system consists of double wishbones at both the front and rear, with adaptive dampers that adjust to road conditions. Ventilated disc brakes are fitted to all four wheels, providing ample stopping power. The braking system is enhanced by ABS (Anti-lock Braking System) and electronic stability control. The steering is electrically assisted, offering precise and responsive control. The suspension tuning is geared towards providing a comfortable ride without sacrificing handling agility.
Market Reception & Comparison
The Jaguar XJ Long R was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and refined driving experience. However, some reviewers noted that its fuel economy was relatively poor compared to some of its rivals. The car’s price also positioned it at the higher end of the luxury sedan segment. Compared to the XJ models with the 3.0-liter V6 engine, the R offered a significant performance advantage but came at a higher cost. The XJ R’s blend of British luxury and performance appealed to buyers seeking an alternative to the more mainstream German luxury sedans.
Legacy
The Jaguar XJ Long R 5.0 V8 Automatic remains a desirable used car today, particularly for those seeking a luxurious and powerful grand tourer. 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 may become more challenging over time, the XJ R continues to offer a compelling combination of performance, luxury, and style. Its status as a modern classic is assured, representing a high point in Jaguar’s long history of producing exceptional automobiles.
