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), 2005 Audi S4 is equipped with a bigger engine. In terms of performance, 2005 Audi S4 (340 HP @ 4000 RPM) has 69 more horse power than 2009 Audi A8. (271 HP @ 3750 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 155 kg more than 2005 Audi S4.
Let's talk about torque, 2009 Audi A8 (650 Nm) has 240 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 | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 3936 cc | 4172 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 271 HP | 340 HP |
| Engine RPM | 3750 RPM | 4000 RPM |
| Torque | 650 Nm | 410 Nm |
| Engine Compression Ratio | 18.0:1 | 11.0:1 |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1940 kg | 1785 kg |
| Vehicle Length | 5060 mm | 4550 mm |
| Vehicle Width | 1900 mm | 1770 mm |
| Vehicle Height | 1450 mm | 1430 mm |
| Wheelbase Size | 2950 mm | 2470 mm |
| Fuel Consumption Overall | 9.7 L/100km | 13.8 L/100km |
| Fuel Tank Capacity | 90 L | 66 L |
