2009 Audi A8 vs. 2007 Audi S4
To start off, 2009 Audi A8 is newer by 2 year(s). Which means there will be less support and parts availability for 2007 Audi S4. In addition, the cost of maintenance, including insurance, on 2007 Audi S4 would be higher. Both 2009 Audi A8 and 2007 Audi S4 are equipped with a 4,163 cc engine. In terms of performance, 2009 Audi A8 (350 HP @ 6800 RPM) has 9 more horse power than 2007 Audi S4. (341 HP @ 7000 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2007 Audi S4.
Let's talk about torque, 2009 Audi A8 (441 Nm @ 3500 RPM) has 31 more torque (in Nm) than 2007 Audi S4. (410 Nm @ 3500 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi S4. 2009 Audi A8 has automatic transmission and 2007 Audi S4 has manual transmission. 2007 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:
| 2009 Audi A8 | 2007 Audi S4 | |
| Make | Audi | Audi |
| Model | A8 | S4 |
| Year Released | 2009 | 2007 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4163 cc | 4163 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 5 valves |
| Horse Power | 350 HP | 341 HP |
| Engine RPM | 6800 RPM | 7000 RPM |
| Torque | 441 Nm | 410 Nm |
| Torque RPM | 3500 RPM | 3500 RPM |
| Engine Bore Size | 84.5 mm | 84.6 mm |
| Engine Stroke Size | 92.8 mm | 92.7 mm |
| Engine Compression Ratio | 12.5:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Length | 5200 mm | 4590 mm |
| Vehicle Width | 1900 mm | 1730 mm |
| Vehicle Height | 1460 mm | 1430 mm |
| Wheelbase Size | 3080 mm | 2650 mm |
| Fuel Tank Capacity | 90 L | 63 L |
