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 5,998 cc, 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (444 HP @ 6200 RPM) has 104 more horse power than 2005 Audi S4. (340 HP @ 4000 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2005 Audi S4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 225 kg more than 2005 Audi S4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2009 Audi A8 (580 Nm) has 170 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 | 5998 cc | 4163 cc |
| Engine Type | W | V |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 444 HP | 340 HP |
| Engine RPM | 6200 RPM | 4000 RPM |
| Torque | 580 Nm | 410 Nm |
| Engine Bore Size | 84 mm | 85 mm |
| Engine Stroke Size | 90.2 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 | 1995 kg | 1770 kg |
| Vehicle Length | 5190 mm | 4550 mm |
| Vehicle Width | 1900 mm | 1770 mm |
| Vehicle Height | 1460 mm | 1430 mm |
| Wheelbase Size | 3080 mm | 2770 mm |
| Fuel Consumption Overall | 13.8 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 66 L |
