2004 Audi A4 vs. 2006 Audi A8
To start off, 2006 Audi A8 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 Audi A4. In addition, the cost of maintenance, including insurance, on 2004 Audi A4 would be higher. At 4,172 cc (8 cylinders), 2006 Audi A8 is equipped with a bigger engine. In terms of performance, 2006 Audi A8 (329 HP @ 6500 RPM) has 169 more horse power than 2004 Audi A4. (160 HP @ 5700 RPM) In normal driving conditions, 2006 Audi A8 should accelerate faster than 2004 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2006 Audi A8 weights approximately 379 kg more than 2004 Audi A4. 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, 2006 Audi A8 (430 Nm @ 3500 RPM) has 205 more torque (in Nm) than 2004 Audi A4. (225 Nm @ 1950 RPM). This means 2006 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2004 Audi A4.
Compare all specifications:
| 2004 Audi A4 | 2006 Audi A8 | |
| Make | Audi | Audi |
| Model | A4 | A8 |
| Year Released | 2004 | 2006 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1781 cc | 4172 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 5 valves | 5 valves |
| Horse Power | 160 HP | 329 HP |
| Engine RPM | 5700 RPM | 6500 RPM |
| Torque | 225 Nm | 430 Nm |
| Torque RPM | 1950 RPM | 3500 RPM |
| Engine Bore Size | 81 mm | 84.6 mm |
| Engine Stroke Size | 86.4 mm | 93 mm |
| Engine Compression Ratio | 9.3:1 | 11.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Acceleration 0-100mph | 8.7 seconds | 6.3 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1476 kg | 1855 kg |
| Vehicle Length | 4550 mm | 5060 mm |
| Vehicle Width | 1780 mm | 1900 mm |
| Vehicle Height | 1430 mm | 1450 mm |
| Wheelbase Size | 2470 mm | 2950 mm |
| Fuel Consumption Overall | 9.4 L/100km | 8.8 L/100km |
| Fuel Tank Capacity | 63 L | 90 L |
