| Engine | XJ8 | Vanden Plas | XJR | Super V8 |
| Type | DOHC AJ33 valves | DOHC AJ33 V8 | DOHC AJ V8 | DOHC AJ33 V8 |
| Cam phasing | Variable | Variable | Variable | Variable |
| Construction | Aluminum alloy cylinder head/block | Aluminum alloy cylinder head/block | Aluminum alloy cylinder head/block | Aluminum alloy cylinder head/block |
| Cylinders | 90-degree V8 | 90-degree V8 | 90-degree
V8 | 90-degree
V8 |
| Valves per cylinder | 4 | 4 | 4 | 4 |
| Bore | 86.1 mm (3.39 in.) | 86.1 mm (3.39 in.) | 86.1 mm (3.39 in.) | 86.1 mm (3.39 in.) |
| Stroke | 90.4 mm (3.56 in.) | 90.4 mm (3.56 in.) | 90.4 mm (3.56 in.) | 90. 4 mm (3.56 in.) |
| Displacement | 4.2 litre | 4.2 litre | 4.2 litre | 4.2 litre |
| Compression ratio | 11.0:1 | 11.0:1 | 9.1:1 | 9.1:1 |
| Induction | Naturally aspirated | Naturally aspirated | Supercharged | Supercharged |
| Horsepower (SAE) | 300 bhp @ 6,000 rpm | 300 bhp @ 6,000 rpm | 400 bhp @ 6,100 rpm | 400 bhp @ 6,100 rpm |
| Maximum torque | 310 lb.-ft. @ 4,100 rpm | 310 lb.-ft. @ 4,100 rpm | 413 lb.-ft. @ 3,500 rpm | 413 lb.-ft. @ 3,500 rpm |
| Performance | XJ8 | Vanden Plas | XJR | Super V8 |
| 0-100 km/hr | 6.4 seconds | 6.4 seconds | 5.3 seconds | 5.3 seconds |
| Maximum speed (electronically limited) | 195 km/h | 195 km/h | 249 km/h | 249 km/h |
| EPA estimated fuel economy (L/100 km) | 12.8 city/8.0 highway | 12.8 city/8.1 highway | 13.9 city/9.1 highway | 13.9 city/9.1 highway</TR< TBODY> |
| Braking | XJ8 | Vanden Plas | XJR | Super V8 |
| Front | 12.0 x 1.18 in. ventilated discs, floating cast iron calipers | 12.0 x 1.18 in. ventilated discs, floating cast iron calipers | 14.0 in. x 1.26 in. ventilated disks, floating composite aluminum and cast iron calipers | 14.0 in. x 1.26 in. ventilated disks, floating composite aluminum and cast iron calipers |
| Rear | 11.8 x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper | 11.8 x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper | 12.83 x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper | 12.83 x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper |
| Wheels & Tires | XJ8 | Vanden Plas | XJR | Super V8 |
| Wheels | 19 x 8.5 in. alloy, Polaris | 19 x 8 in. alloy, Carelia | 20 x 9 in. alloy, Callisto | 20 x 9 in. alloy, Callisto |
| Tires | 255/40 R19 All Season or Performance | 255/40 R19 All Season or Performance | 255/35 ZR20 Performance | 255/35 ZR20 Performance |
| Steering | XJ8 | Vanden Plas | XJR | Super V8 |
| Turning circle (curb to curb) | 11.61 m (38.1 ft.) | 12.04 m (39.5 ft.) | 11.61 m (38.1 ft.) | 12.04 m (39.5 ft.) |
| Dimensions | XJ8 | Vanden Plas | XJR | Super V8 |
| Length | 5,090 mm (200.4 in.) | 5,215 mm (205.3 in.) | 5090 mm (200.4 in.) | 5,215 mm (205.3 in.) |
| Height | 1,448 mm (57.0 in.) | 1,455 mm (57.3 in.) | 1,448 mm (57.0 in.) | 1,455 mm (57.3 in.) |
| Width (including mirrors) | 2,108 mm (83.0 in.) | 2,108 mm (83.0 in.) | 2,108 mm (83.0 in.) | 2,108 mm (83.0 in.) |
| Wheelbase | 3,033 mm (119.4 in.) | 3,160 mm (124.4 in.) | 3,033 mm (119.4 in.) | 3,160 mm (124.4 in.) |
| Curb weight | 1,690 kg (3,726 lb.) | 1,732 kg (3,819 lb.) | 1,795 kg (3,958 lb.) | 1,815 kg (4,001 lb.) |
| Headroom (front) | 975 mm (38.4 in.) | 975 mm (38.4 in.) | 975 mm (38.4 in.) | 975 mm (38.4 in.) |
| Headroom (rear) | 980 mm (38.6 in.) | 980 mm (38.6 in.) | 980 mm (38.6 in.) | 980 mm (38.6 in.) |
| Shoulder room (front) | 1,481 mm (58.3 in.) | 1,481 mm (58.3 in.) | 1,481 mm (58.3 in.) | 1,481 mm (58.3 in.) |
| Shoulder room (rear) | 1,478 mm (58.2 in.) | 1,478 mm (58.2 in.) | 1,478 mm (58.2 in.) | 1,478 mm (58.2 in.) |
| Legroom (front) | 1,095 mm (43.1 in.) | 1,095 mm (43.1 in.) | 1,095 mm (43.1 in.) | 1,095 mm (43.1 in.) |
| Legroom (rear) | 983 mm (38.7 in.) | 998 mm (39.3 in.) | 983 mm (38.7 in.) | 998 mm (39.3 in.)</TR< TBODY> |
| Capacities | XJ8 | Vanden Plas | XJR | Super V8 |
| Trunk (MVMA) | 16.4 cu. ft. | 16.4 cu. ft. | 16.4 cu. ft. | 16.4 cu. ft. |
| Fuel | 85 L | 85 L | 84 L | 84 L |