2009 Audi S8 vs. 1999 Audi A8
To start off, 2009 Audi S8 is newer by 10 year(s). Which means there will be less support and parts availability for 1999 Audi A8. In addition, the cost of maintenance, including insurance, on 1999 Audi A8 would be higher. At 5,204 cc (10 cylinders), 2009 Audi S8 is equipped with a bigger engine. In terms of performance, 2009 Audi S8 (450 HP @ 7000 RPM) has 260 more horse power than 1999 Audi A8. (190 HP @ 6000 RPM). In normal driving conditions, 2009 Audi S8 should accelerate faster than 1999 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 1999 Audi A8 weights approximately 460 kg more than 2009 Audi S8.
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 S8 (540 Nm @ 3500 RPM) has 260 more torque (in Nm) than 1999 Audi A8. (280 Nm @ 3200 RPM). This means 2009 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 1999 Audi A8.
Compare all specifications:
| 2009 Audi S8 | 1999 Audi A8 | |
| Make | Audi | Audi |
| Model | S8 | A8 |
| Year Released | 2009 | 1999 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 5204 cc | 2771 cc |
| Engine Cylinders | 10 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 450 HP | 190 HP |
| Engine RPM | 7000 RPM | 6000 RPM |
| Torque | 540 Nm | 280 Nm |
| Torque RPM | 3500 RPM | 3200 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | AWD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1175 kg | 1635 kg |
| Vehicle Length | 5070 mm | 5040 mm |
| Vehicle Width | 1900 mm | 1890 mm |
| Vehicle Height | 1430 mm | 1440 mm |
| Wheelbase Size | 2950 mm | 2890 mm |
