2009 Audi A8 vs. 2005 Porsche 911
To start off, 2009 Audi A8 is newer by 4 year(s). Which means there will be less support and parts availability for 2005 Porsche 911. In addition, the cost of maintenance, including insurance, on 2005 Porsche 911 would be higher. At 3,822 cc (6 cylinders), 2005 Porsche 911 is equipped with a bigger engine. In terms of performance, 2005 Porsche 911 (350 HP @ 6600 RPM) has 121 more horse power than 2009 Audi A8. (229 HP @ 4000 RPM) In normal driving conditions, 2005 Porsche 911 should accelerate faster than 2009 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 355 kg more than 2005 Porsche 911.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear wheel drive vehicles. 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, 2009 Audi A8 (450 Nm @ 1400 RPM) has 50 more torque (in Nm) than 2005 Porsche 911. (400 Nm @ 4600 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Porsche 911.
Compare all specifications:
| 2009 Audi A8 | 2005 Porsche 911 | |
| Make | Audi | Porsche |
| Model | A8 | 911 |
| Year Released | 2009 | 2005 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Rear |
| Engine Size | 2966 cc | 3822 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 229 HP | 350 HP |
| Engine RPM | 4000 RPM | 6600 RPM |
| Torque | 450 Nm | 400 Nm |
| Torque RPM | 1400 RPM | 4600 RPM |
| Engine Bore Size | 83 mm | 99 mm |
| Engine Stroke Size | 91.4 mm | 82.8 mm |
| Engine Compression Ratio | 17.0:1 | 11.8:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 243 km/hour | 288 km/hour |
| Acceleration 0-100mph | 7.8 seconds | 4.8 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1830 kg | 1475 kg |
| Vehicle Height | 1900 mm | 1310 mm |
| Wheelbase Size | 2950 mm | 2360 mm |
| Fuel Consumption Overall | 8.4 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 64 L |
