2009 Audi A8 vs. 2005 Audi S4
To start off, 2009 Audi A8 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 4,172 cc (8 cylinders), 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2005 Audi S4 (340 HP @ 6300 RPM) has 10 more horse power than 2009 Audi A8. (330 HP @ 6500 RPM) In normal driving conditions, 2005 Audi S4 should accelerate faster than 2009 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 120 kg more than 2005 Audi S4.
Let's talk about torque, 2009 Audi A8 (430 Nm) has 20 more torque (in Nm) than 2005 Audi S4. (410 Nm). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi S4.
Compare all specifications:
| 2009 Audi A8 | 2005 Audi S4 | |
| Make | Audi | Audi |
| Model | A8 | S4 |
| Year Released | 2009 | 2005 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4172 cc | 4163 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 5 valves |
| Horse Power | 330 HP | 340 HP |
| Engine RPM | 6500 RPM | 6300 RPM |
| Torque | 430 Nm | 410 Nm |
| Engine Bore Size | 84.5 mm | 85.1 mm |
| Engine Stroke Size | 93 mm | 93 mm |
| Engine Compression Ratio | 11.0:1 | 11.0:1 |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1855 kg | 1735 kg |
| Vehicle Length | 5060 mm | 4550 mm |
| Vehicle Width | 1900 mm | 1770 mm |
| Vehicle Height | 1450 mm | 1430 mm |
| Wheelbase Size | 2950 mm | 2660 mm |
| Fuel Consumption Overall | 11.9 L/100km | 13.8 L/100km |
| Fuel Tank Capacity | 90 L | 63 L |
