1999 Audi S8 vs. 2009 Audi A8
To start off, 2009 Audi A8 is newer by 10 year(s). Which means there will be less support and parts availability for 1999 Audi S8. In addition, the cost of maintenance, including insurance, on 1999 Audi S8 would be higher. At 4,170 cc (8 cylinders), 1999 Audi S8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (276 HP @ 6000 RPM) has 29 more horse power than 1999 Audi S8. (247 HP @ 7000 RPM) In normal driving conditions, 2009 Audi A8 should accelerate faster than 1999 Audi S8. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 20 kg more than 1999 Audi S8. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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 (360 Nm @ 3750 RPM) has 30 more torque (in Nm) than 1999 Audi S8. (330 Nm @ 3400 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 1999 Audi S8.
Compare all specifications:
| 1999 Audi S8 | 2009 Audi A8 | |
| Make | Audi | Audi |
| Model | S8 | A8 |
| Year Released | 1999 | 2009 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4170 cc | 3696 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 247 HP | 276 HP |
| Engine RPM | 7000 RPM | 6000 RPM |
| Torque | 330 Nm | 360 Nm |
| Torque RPM | 3400 RPM | 3750 RPM |
| Engine Bore Size | 84.5 mm | 84.5 mm |
| Engine Stroke Size | 93 mm | 82.4 mm |
| Engine Compression Ratio | 11.0:1 | 11.0:1 |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.6 seconds | 7.3 seconds |
| Drive Type | AWD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1750 kg | 1770 kg |
| Vehicle Length | 5040 mm | 5060 mm |
| Vehicle Width | 1890 mm | 1900 mm |
| Vehicle Height | 1420 mm | 1450 mm |
| Wheelbase Size | 2890 mm | 2950 mm |
| Fuel Consumption Overall | 13.9 L/100km | 11.7 L/100km |
| Fuel Tank Capacity | 90 L | 90 L |
