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 3,936 cc (8 cylinders), 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2005 Porsche 911 (350 HP @ 6600 RPM) has 78 more horse power than 2009 Audi A8. (272 HP @ 3750 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 435 kg more than 2005 Porsche 911.
Because 2009 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2005 Porsche 911. In wet, icy, snow, or gravel driving conditions, 2009 Audi A8 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, 2009 Audi A8 (650 Nm @ 1800 RPM) has 242 more torque (in Nm) than 2005 Porsche 911. (408 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 | Convertible |
| Engine Position | Front | Rear |
| Engine Size | 3936 cc | 3822 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 272 HP | 350 HP |
| Engine RPM | 3750 RPM | 6600 RPM |
| Torque | 650 Nm | 408 Nm |
| Torque RPM | 1800 RPM | 4600 RPM |
| Engine Bore Size | 81 mm | 99 mm |
| Engine Stroke Size | 95.5 mm | 82.8 mm |
| Engine Compression Ratio | 18.0:1 | 11.8:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 250 km/hour | 293 km/hour |
| Acceleration 0-100mph | 6.8 seconds | 4.9 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1940 kg | 1505 kg |
| Vehicle Length | 5190 mm | 4470 mm |
| Vehicle Width | 1900 mm | 1810 mm |
| Vehicle Height | 1460 mm | 1310 mm |
| Wheelbase Size | 3080 mm | 2360 mm |
| Fuel Consumption Overall | 9.6 L/100km | 11.6 L/100km |
| Fuel Tank Capacity | 90 L | 64 L |
