2005 Audi A4 vs. 2008 Audi A8
To start off, 2008 Audi A8 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 Audi A4. In addition, the cost of maintenance, including insurance, on 2005 Audi A4 would be higher. At 2,976 cc (6 cylinders), 2005 Audi A4 is equipped with a bigger engine. In terms of performance, 2008 Audi A8 (230 HP @ 4000 RPM) has 12 more horse power than 2005 Audi A4. (218 HP @ 6300 RPM) In normal driving conditions, 2008 Audi A8 should accelerate faster than 2005 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi A8 weights approximately 376 kg more than 2005 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2008 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2005 Audi A4. In wet, icy, snow, or gravel driving conditions, 2008 Audi A8 will offer significantly more control. 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, 2008 Audi A8 (450 Nm @ 1400 RPM) has 150 more torque (in Nm) than 2005 Audi A4. (300 Nm @ 3200 RPM). This means 2008 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi A4.
Compare all specifications:
| 2005 Audi A4 | 2008 Audi A8 | |
| Make | Audi | Audi |
| Model | A4 | A8 |
| Year Released | 2005 | 2008 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2976 cc | 2967 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | V |
| Horse Power | 218 HP | 230 HP |
| Engine RPM | 6300 RPM | 4000 RPM |
| Torque | 300 Nm | 450 Nm |
| Torque RPM | 3200 RPM | 1400 RPM |
| Engine Bore Size | 82.5 mm | 83 mm |
| Engine Stroke Size | 92.8 mm | 91.4 mm |
| Engine Compression Ratio | 10.5:1 | 17.0:1 |
| Top Speed | 238 km/hour | 243 km/hour |
| Acceleration 0-100mph | 6.9 seconds | 7.8 seconds |
| Drive Type | Front | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1460 kg | 1836 kg |
| Wheelbase Size | 2770 mm | 2950 mm |
| Fuel Consumption Overall | 9.4 L/100km | 8.4 L/100km |
| Fuel Tank Capacity | 70 L | 90 L |
