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 3,594 cc (6 cylinders), 2005 Porsche 911 is equipped with a bigger engine. In terms of performance, 2005 Porsche 911 (320 HP @ 6800 RPM) has 91 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 380 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 80 more torque (in Nm) than 2005 Porsche 911. (370 Nm @ 4250 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Porsche 911. 2009 Audi A8 has automatic transmission and 2005 Porsche 911 has manual transmission. 2005 Porsche 911 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2009 Audi A8 will be easier to drive especially in heavy traffic.
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 | 3594 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 229 HP | 320 HP |
| Engine RPM | 4000 RPM | 6800 RPM |
| Torque | 450 Nm | 370 Nm |
| Torque RPM | 1400 RPM | 4250 RPM |
| Engine Bore Size | 83 mm | 96 mm |
| Engine Stroke Size | 91.4 mm | 82.8 mm |
| Engine Compression Ratio | 17.0:1 | 11.3:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 243 km/hour | 280 km/hour |
| Acceleration 0-100mph | 7.8 seconds | 5.1 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1830 kg | 1450 kg |
| Vehicle Height | 1900 mm | 1320 mm |
| Wheelbase Size | 2950 mm | 2360 mm |
| Fuel Consumption Overall | 8.4 L/100km | 11.3 L/100km |
| Fuel Tank Capacity | 90 L | 64 L |
