2006 Audi A8 vs. 2004 Audi S4
To start off, 2006 Audi A8 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 Audi S4. In addition, the cost of maintenance, including insurance, on 2004 Audi S4 would be higher. At 5,997 cc, 2006 Audi A8 is equipped with a bigger engine. In terms of performance, 2006 Audi A8 (450 HP @ 6200 RPM) has 111 more horse power than 2004 Audi S4. (339 HP @ 7000 RPM). In normal driving conditions, 2006 Audi A8 should accelerate faster than 2004 Audi S4. With that said, vehicle weight also plays an important factor in acceleration. 2006 Audi A8 weights approximately 380 kg more than 2004 Audi S4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear wheel drive vehicles. 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, 2006 Audi A8 (580 Nm @ 4000 RPM) has 170 more torque (in Nm) than 2004 Audi S4. (410 Nm @ 3500 RPM). This means 2006 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2004 Audi S4.
Compare all specifications:
| 2006 Audi A8 | 2004 Audi S4 | |
| Make | Audi | Audi |
| Model | A8 | S4 |
| Year Released | 2006 | 2004 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 5997 cc | 4162 cc |
| Engine Type | W | V |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 450 HP | 339 HP |
| Engine RPM | 6200 RPM | 7000 RPM |
| Torque | 580 Nm | 410 Nm |
| Torque RPM | 4000 RPM | 3500 RPM |
| Engine Bore Size | 84 mm | 84.5 mm |
| Engine Stroke Size | 90.2 mm | 92.8 mm |
| Engine Compression Ratio | 11.0:1 | 11.0:1 |
| Drive Type | 4WD | 4WD |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 2145 kg | 1765 kg |
| Vehicle Length | 5200 mm | 4590 mm |
| Vehicle Width | 1900 mm | 1780 mm |
| Vehicle Height | 1460 mm | 1430 mm |
| Wheelbase Size | 3080 mm | 2470 mm |
| Fuel Consumption Highway | 11.2 L/100km | 9.1 L/100km |
| Fuel Consumption City | 15.7 L/100km | 17.9 L/100km |
| Fuel Consumption Overall | 13.8 L/100km | 12.3 L/100km |
| Fuel Tank Capacity | 90 L | 63 L |
