2003 Jaguar XJ vs. 2005 Porsche 911
To start off, 2005 Porsche 911 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Jaguar XJ. In addition, the cost of maintenance, including insurance, on 2003 Jaguar XJ would be higher. At 3,600 cc (6 cylinders), 2005 Porsche 911 is equipped with a bigger engine. In terms of performance, 2005 Porsche 911 (445 HP @ 5700 RPM) has 205 more horse power than 2003 Jaguar XJ. (240 HP @ 6800 RPM) In normal driving conditions, 2005 Porsche 911 should accelerate faster than 2003 Jaguar XJ. With that said, vehicle weight also plays an important factor in acceleration. 2005 Porsche 911 weights approximately 45 kg more than 2003 Jaguar XJ. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 Porsche 911 is four wheel drive (4WD), it will have significant more traction and grip than 2003 Jaguar XJ. In wet, icy, snow, or gravel driving conditions, 2005 Porsche 911 will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2005 Porsche 911 (620 Nm @ 3500 RPM) has 327 more torque (in Nm) than 2003 Jaguar XJ. (293 Nm @ 4100 RPM). This means 2005 Porsche 911 will have an easier job in driving up hills or pulling heavy equipment than 2003 Jaguar XJ.
Compare all specifications:
| 2003 Jaguar XJ | 2005 Porsche 911 | |
| Make | Jaguar | Porsche |
| Model | XJ | 911 |
| Year Released | 2003 | 2005 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Rear |
| Engine Size | 2968 cc | 3600 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 240 HP | 445 HP |
| Engine RPM | 6800 RPM | 5700 RPM |
| Torque | 293 Nm | 620 Nm |
| Torque RPM | 4100 RPM | 3500 RPM |
| Engine Bore Size | 89 mm | 100 mm |
| Engine Stroke Size | 79.5 mm | 76.4 mm |
| Engine Compression Ratio | 11.0:1 | 9.4:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1545 kg | 1590 kg |
| Vehicle Length | 5100 mm | 4440 mm |
| Vehicle Width | 1870 mm | 1840 mm |
| Vehicle Height | 1450 mm | 1300 mm |
| Wheelbase Size | 3040 mm | 2360 mm |
| Fuel Tank Capacity | 85 L | 64 L |
