2008 Audi A8 vs. 2009 Audi A4
To start off, 2009 Audi A4 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 Audi A8. In addition, the cost of maintenance, including insurance, on 2008 Audi A8 would be higher. At 3,934 cc (8 cylinders), 2008 Audi A8 is equipped with a bigger engine. In terms of performance, 2008 Audi A8 (271 HP @ 3750 RPM) has 60 more horse power than 2009 Audi A4. (211 HP @ 4300 RPM). In normal driving conditions, 2008 Audi A8 should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi A8 weights approximately 1010 kg more than 2009 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, 2008 Audi A8 (650 Nm @ 1800 RPM) has 300 more torque (in Nm) than 2009 Audi A4. (350 Nm @ 1500 RPM). This means 2008 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi A4.
Compare all specifications:
| 2008 Audi A8 | 2009 Audi A4 | |
| Make | Audi | Audi |
| Model | A8 | A4 |
| Year Released | 2008 | 2009 |
| Body Type | Sedan | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 3934 cc | 1984 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 271 HP | 211 HP |
| Engine RPM | 3750 RPM | 4300 RPM |
| Torque | 650 Nm | 350 Nm |
| Torque RPM | 1800 RPM | 1500 RPM |
| Engine Bore Size | 81 mm | 82.5 mm |
| Engine Stroke Size | 95.5 mm | 92.8 mm |
| Engine Compression Ratio | 18.0:1 | 17.0:1 |
| Fuel Type | Diesel | Gasoline |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1940 kg | 930 kg |
| Vehicle Length | 5060 mm | 4710 mm |
| Vehicle Width | 1900 mm | 1840 mm |
| Vehicle Height | 1450 mm | 1440 mm |
| Wheelbase Size | 2950 mm | 2820 mm |
| Fuel Consumption Overall | 9.7 L/100km | 10.2 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
