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 5,204 cc (10 cylinders), 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (444 HP @ 7000 RPM) has 94 more horse power than 2005 Porsche 911. (350 HP @ 6600 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2005 Porsche 911. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 435 kg more than 2005 Porsche 911. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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 (540 Nm @ 3500 RPM) has 132 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 | 5204 cc | 3822 cc |
| Engine Cylinders | 10 cylinders | 6 cylinders |
| Engine Type | V | boxer |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 444 HP | 350 HP |
| Engine RPM | 7000 RPM | 6600 RPM |
| Torque | 540 Nm | 408 Nm |
| Torque RPM | 3500 RPM | 4600 RPM |
| Engine Bore Size | 84.5 mm | 99 mm |
| Engine Stroke Size | 92.8 mm | 82.8 mm |
| Engine Compression Ratio | 12.5:1 | 11.8:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 293 km/hour |
| Acceleration 0-100mph | 5.1 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 | 5070 mm | 4470 mm |
| Vehicle Width | 1900 mm | 1810 mm |
| Vehicle Height | 1430 mm | 1310 mm |
| Wheelbase Size | 2950 mm | 2360 mm |
| Fuel Consumption Highway | 12.4 L/100km | 9.1 L/100km |
| Fuel Consumption City | 18.2 L/100km | 13.1 L/100km |
| Fuel Consumption Overall | 15.8 L/100km | 11.6 L/100km |
| Fuel Tank Capacity | 90 L | 64 L |
