2005 Audi A8 vs. 2008 Audi S5
To start off, 2008 Audi S5 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 Audi A8. In addition, the cost of maintenance, including insurance, on 2005 Audi A8 would be higher. At 4,163 cc (8 cylinders), 2008 Audi S5 is equipped with a bigger engine. In terms of performance, 2008 Audi S5 (354 HP @ 6800 RPM) has 136 more horse power than 2005 Audi A8. (218 HP @ 6300 RPM) In normal driving conditions, 2008 Audi S5 should accelerate faster than 2005 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi S5 weights approximately 865 kg more than 2005 Audi A8. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2008 Audi S5 is four wheel drive (4WD), it will have significant more traction and grip than 2005 Audi A8. In wet, icy, snow, or gravel driving conditions, 2008 Audi S5 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, 2008 Audi S5 (441 Nm @ 3500 RPM) has 141 more torque (in Nm) than 2005 Audi A8. (300 Nm @ 8200 RPM). This means 2008 Audi S5 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi A8.
Compare all specifications:
| 2005 Audi A8 | 2008 Audi S5 | |
| Make | Audi | Audi |
| Model | A8 | S5 |
| Year Released | 2005 | 2008 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2976 cc | 4163 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 218 HP | 354 HP |
| Engine RPM | 6300 RPM | 6800 RPM |
| Torque | 300 Nm | 441 Nm |
| Torque RPM | 8200 RPM | 3500 RPM |
| Engine Bore Size | 82.5 mm | 84.5 mm |
| Engine Stroke Size | 92.8 mm | 92.8 mm |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 242 km/hour | 249 km/hour |
| Drive Type | Front | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 900 kg | 1765 kg |
| Vehicle Length | 5190 mm | 4640 mm |
| Vehicle Width | 1900 mm | 1990 mm |
| Vehicle Height | 1460 mm | 1380 mm |
| Wheelbase Size | 3080 mm | 2760 mm |
| Fuel Consumption Overall | 9.6 L/100km | 7.8 L/100km |
| Fuel Tank Capacity | 90 L | 63 L |
