2005 Audi S4 vs. 2009 Audi A8
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 105 more horse power than 2005 Audi S4. (339 HP @ 7000 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 320 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.
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, 2009 Audi A8 (580 Nm @ 4000 RPM) has 150 more torque (in Nm) than 2005 Audi S4. (430 Nm @ 3500 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi S4. 2009 Audi A8 has automatic transmission and 2005 Audi S4 has manual transmission. 2005 Audi S4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2009 Audi A8 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Audi S4 | 2009 Audi A8 | |
| Make | Audi | Audi |
| Model | S4 | A8 |
| Year Released | 2005 | 2009 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4163 cc | 5998 cc |
| Engine Type | V | W |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 339 HP | 444 HP |
| Engine RPM | 7000 RPM | 6200 RPM |
| Torque | 430 Nm | 580 Nm |
| Torque RPM | 3500 RPM | 4000 RPM |
| Engine Bore Size | 84.5 mm | 84 mm |
| Engine Stroke Size | 92.8 mm | 90.2 mm |
| Engine Compression Ratio | 11.0:1 | 11.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 5.2 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1675 kg | 1995 kg |
| Vehicle Length | 4580 mm | 5190 mm |
| Vehicle Width | 1790 mm | 1900 mm |
| Vehicle Height | 1420 mm | 1460 mm |
| Wheelbase Size | 2580 mm | 3080 mm |
| Fuel Consumption Overall | 13.4 L/100km | 13.8 L/100km |
| Fuel Tank Capacity | 66 L | 90 L |
