The Jaguar XJ X351 5.0 V8 Supercharged Automatic, produced from 2009 to 2012, represented the pinnacle of luxury and performance within the XJ range during its initial production run. This variant, equipped with a 510 horsepower supercharged V8 engine and a six-speed automatic transmission, was positioned as the flagship model, offering a blend of exhilarating acceleration, sophisticated technology, and traditional Jaguar refinement. It formed part of the X351 generation, a significant redesign of the XJ, moving away from the traditional Jaguar styling cues towards a more contemporary and sculpted aesthetic. The X351 aimed to compete directly with the German luxury sedans – the BMW 7 Series, Mercedes-Benz S-Class, and Audi A8 – offering a distinctly British alternative.
Technical Specifications
| Brand | Jaguar |
| Model | XJ |
| Generation | XJ (X351) |
| Type (Engine) | 5.0 V8 Supercharged (510 Hp) Automatic 6-speed |
| Start of production | 2009 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (NEDC) | 18.3 l/100 km (12.9 US mpg, 15.4 UK mpg, 5.5 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 12.1 l/100 km (19.4 US mpg, 23.3 UK mpg, 8.3 km/l) |
| CO2 emissions (NEDC) | 289 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 3.7 kg/Hp, 269.6 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 330.3 Nm/tonne |
| Power | 510 Hp @ 6000-6500 rpm |
| Power per litre | 102 Hp/l |
| Torque | 625 Nm @ 2500-5500 rpm (460.98 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 | 1892 kg (4171.15 lbs.) |
| Max. weight | 2365 kg (5213.93 lbs.) |
| Max load | 473 kg (1042.79 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 | 5122 mm (201.65 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 | 3032 mm (119.37 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear (Back) track | 1604 mm (63.15 in.) |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 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 X351 Supercharged lay Jaguar’s 5.0-liter AJ-V8 engine, internally designated as the 508PS. This engine featured 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, optimized fuel efficiency and reduced emissions. The engine produced 510 horsepower at 6000-6500 rpm and a substantial 625 Nm (460.98 lb-ft) of torque between 2500 and 5500 rpm. This power was delivered to the rear wheels through a ZF 6HP26 six-speed automatic transmission, known for its smooth shifts and responsiveness. The transmission was calibrated to provide a balance between performance and comfort, with a focus on effortless cruising.
Driving Characteristics
The 5.0 V8 Supercharged Automatic XJ delivered truly impressive performance. The 0-60 mph sprint was dispatched in around 4.7 seconds, and the electronically limited top speed of 155 mph was easily achievable. The supercharger eliminated any turbo lag, providing immediate and linear power delivery. The six-speed automatic transmission, while not as quick-shifting as some modern eight or nine-speed units, offered smooth and refined gear changes. The XJ’s air suspension provided a comfortable ride, absorbing bumps and imperfections in the road with ease. However, the car’s considerable weight (approximately 4171 lbs) was noticeable in spirited driving, particularly during cornering.
Equipment & Trim Levels
The Supercharged XJ came standard with a comprehensive array of luxury features. Leather upholstery, wood veneer trim, heated and ventilated front seats, a premium sound system, and a navigation system were all included as standard. Optional extras included rear-seat entertainment, massaging seats, and a panoramic sunroof. The XJ’s interior was renowned for its craftsmanship and attention to detail, creating a truly opulent and comfortable environment.
Chassis & Braking
The XJ X351 utilized a lightweight aluminum chassis, contributing to its relatively low weight for a full-size luxury sedan. The front suspension featured double wishbones with coil springs and a transverse stabilizer bar, while the rear suspension employed an independent multi-link setup with air suspension and a transverse stabilizer bar. This combination provided a comfortable ride and 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.
Market Reception & Comparison
The Jaguar XJ X351 Supercharged was generally well-received by automotive critics. It was praised for its powerful engine, luxurious interior, and comfortable ride. However, some critics noted that its fuel economy was relatively poor compared to its German rivals. Compared to the naturally aspirated 4.2-liter XJ, the Supercharged model offered significantly more performance. Against the 3.0-liter supercharged V6 XJ, the V8 provided a more refined and powerful driving experience, albeit at a higher price point.
Legacy
The Jaguar XJ X351 5.0 V8 Supercharged remains a desirable used car today, particularly for those seeking a blend of luxury, performance, and British character. The AJ-V8 engine, while known for requiring regular maintenance, is generally considered to be a robust and reliable unit when properly cared for. Common issues include timing chain tensioner wear and oil leaks. Despite its age, the XJ X351 continues to offer a compelling alternative to its German competitors, providing a unique and rewarding driving experience.
