2005 Audi S4 vs. 2009 Audi S8
To start off, 2009 Audi S8 is newer by 4 year(s). Which means there will be less support and parts availability for 2005 Audi S4. In addition, the cost of maintenance, including insurance, on 2005 Audi S4 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 110 more horse power than 2005 Audi S4. (340 HP @ 6300 RPM) In normal driving conditions, 2009 Audi S8 should accelerate faster than 2005 Audi S4. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi S4 weights approximately 665 kg more than 2009 Audi S8.
Let's talk about torque, 2009 Audi S8 (540 Nm) has 130 more torque (in Nm) than 2005 Audi S4. (410 Nm). This means 2009 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi S4.
Compare all specifications:
| 2005 Audi S4 | 2009 Audi S8 | |
| Make | Audi | Audi |
| Model | S4 | S8 |
| Year Released | 2005 | 2009 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4161 cc | 5204 cc |
| Engine Cylinders | 8 cylinders | 10 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 340 HP | 450 HP |
| Engine RPM | 6300 RPM | 7000 RPM |
| Torque | 410 Nm | 540 Nm |
| Engine Compression Ratio | 11.0:1 | 12.5:1 |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1840 kg | 1175 kg |
| Vehicle Length | 4580 mm | 5070 mm |
| Vehicle Width | 1780 mm | 1900 mm |
| Vehicle Height | 1400 mm | 1430 mm |
| Wheelbase Size | 2660 mm | 2950 mm |
| Fuel Consumption | 10.2 L/100km | 12.4 L/100km |
| Fuel Consumption City | 13.8 L/100km | 18.2 L/100km |
| Fuel Consumption Overall | 11.8 L/100km | 15.8 L/100km |
| Fuel Tank Capacity | 63 L | 90 L |
