The Jaguar XJ Long (X351) 5.0 V8 Supercharged Automatic, produced from 2009 to 2012, represented the pinnacle of luxury and performance within the XJ range during that period. As part of the fourth generation (X351) of the iconic XJ series, the Long wheelbase model offered an extended cabin for enhanced rear passenger comfort. This particular variant, equipped with the supercharged 5.0-liter V8 engine and a six-speed automatic transmission, was positioned as the flagship offering, catering to buyers seeking uncompromising power, refinement, and prestige. It competed directly with other ultra-luxury sedans such as the BMW 7 Series, Mercedes-Benz S-Class, and Audi A8.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ Long (X351) |
| Type (Engine) | 5.0 V8 Supercharged (470 Hp) Automatic 6-speed |
| Start of production | 2009 year |
| End of production | 2012 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (EPA) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | ULEV II |
| Weight-to-power ratio | 4.2 kg/Hp, 239.7 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 293.2 Nm/tonne |
| Power | 470 Hp @ 6000-6500 rpm |
| Power per litre | 94 Hp/l |
| Torque | 575 Nm @ 2500-5500 rpm (424.1 lb.-ft. @ 2500-5500 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 | 8.6 l (9.09 US qt | 7.57 UK qt) |
| Kerb Weight | 1961 kg (4323.26 lbs.) |
| Max. weight | 2390 kg (5269.05 lbs.) |
| Max load | 429 kg (945.78 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 82 l (21.66 US gal | 18.04 UK gal) |
| Length | 5252 mm (206.77 in.) |
| Width | 1894 mm (74.57 in.) |
| Width with mirrors folded | 1950 mm (76.77 in.) |
| Width including mirrors | 2105 mm (82.87 in.) |
| Height | 1457 mm (57.36 in.) |
| Wheelbase | 3157 mm (124.29 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear (Back) track | 1604 mm (63.15 in.) |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Coil spring, Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Air suspension, Transverse stabilizer |
| Front brakes | Ventilated discs, 380 mm |
| Rear brakes | Ventilated discs, 376 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 245/45 R19; 245/40 R20 Rear wheel tires: 275/40 R19; 275/35 R20 |
| Wheel rims size | Front wheel rims: 9J x 19; 9J x 20 Rear wheel rims: 10J x 19; 10J x 20 |
Powertrain & Engine Architecture
At the heart of the XJ Long 5.0 V8 Supercharged lay Jaguar’s AJ-V8 engine, specifically the 508PS variant. This 5.0-liter (305.12 cubic inches) V8 engine featured a Roots-type supercharger, providing forced induction for increased power output. Direct fuel injection, combined with a double overhead camshaft (DOHC) valvetrain and four valves per cylinder, optimized combustion efficiency and responsiveness. The engine produced 470 horsepower at 6000-6500 rpm and 575 Nm (424.1 lb-ft) of torque between 2500-5500 rpm. The six-speed automatic transmission, sourced from ZF, was calibrated to provide smooth and refined shifts, complementing the engine’s power delivery. This transmission featured a ‘Sport’ mode for more aggressive shifting and engine response.
Driving Characteristics
The combination of the supercharged V8 and the six-speed automatic resulted in exhilarating performance. Acceleration from 0 to 60 mph took approximately 4.9 seconds, and the car was electronically limited to a top speed of 155.34 mph (250 km/h). While the automatic transmission didn’t offer the same level of driver engagement as a manual gearbox, it provided seamless power delivery and made the XJ Long exceptionally easy to drive in all conditions. Compared to the naturally aspirated V8 models, the supercharged variant offered a significant performance advantage, while the automatic transmission prioritized comfort and convenience over outright sportiness. The long wheelbase contributed to a smooth and composed ride, even at high speeds.
Equipment & Trim Levels
The XJ Long 5.0 V8 Supercharged came standard with a comprehensive array of luxury features. These included premium leather upholstery, wood veneer trim, heated and ventilated front and rear seats, a rear seat entertainment system, a panoramic sunroof, and a high-end audio system. Optional extras included upgraded leather options, bespoke interior finishes, and advanced driver-assistance systems. The XJ Long was designed to provide a first-class experience for both the driver and passengers, with a focus on comfort, convenience, and technological sophistication.
Chassis & Braking
The XJ Long utilized an aluminum monocoque chassis, contributing to its relatively low weight for a full-size luxury sedan. The suspension system featured coil springs, double wishbones at the front, and an independent multi-link setup with air suspension at the rear. This combination provided a comfortable ride while maintaining good handling characteristics. Braking duties were handled by ventilated discs on all four wheels, measuring 380mm at the front and 376mm at the rear. An anti-lock braking system (ABS) was standard, ensuring safe and controlled stopping power.
Market Reception & Comparison
The XJ Long 5.0 V8 Supercharged was generally well-received by automotive critics. It was praised for its powerful engine, luxurious interior, and refined driving experience. However, some reviewers noted that its fuel economy was relatively poor, and its maintenance costs could be high. Compared to other trims in the XJ lineup, the supercharged variant offered significantly more performance but came at a higher price point. The naturally aspirated V8 and diesel models provided a more fuel-efficient and affordable alternative, while the supercharged version catered to buyers who prioritized power and prestige.
Legacy
The XJ Long 5.0 V8 Supercharged remains a desirable used car today, particularly among enthusiasts who appreciate its blend of luxury, performance, and British craftsmanship. The AJ-V8 engine, while known for its complexity, is generally considered reliable when properly maintained. Regular servicing and attention to potential oil leaks are crucial for long-term ownership. The X351 generation XJ, and this variant in particular, represents a high point in Jaguar’s history, showcasing the brand’s commitment to creating exceptional luxury automobiles.
