2009 Audi A4 vs. 2009 Audi A8
To start off, both 2009 Audi A4 and 2009 Audi A8 were released in the same year (2009). Therefore the support and the availability on parts for both vehicles should be relatively similar. 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 286 more horse power than 2009 Audi A4. (158 HP @ 4500 RPM) In normal driving conditions, 2009 Audi A8 should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 1065 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.
Because 2009 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2009 Audi A4. In wet, icy, snow, or gravel driving conditions, 2009 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, 2009 Audi A8 (580 Nm @ 4000 RPM) has 330 more torque (in Nm) than 2009 Audi A4. (250 Nm @ 1500 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi A4.
Compare all specifications:
| 2009 Audi A4 | 2009 Audi A8 | |
| Make | Audi | Audi |
| Model | A4 | A8 |
| Year Released | 2009 | 2009 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1798 cc | 5998 cc |
| Engine Type | in-line | W |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 158 HP | 444 HP |
| Engine RPM | 4500 RPM | 6200 RPM |
| Torque | 250 Nm | 580 Nm |
| Torque RPM | 1500 RPM | 4000 RPM |
| Engine Bore Size | 82.5 mm | 84 mm |
| Engine Stroke Size | 84.1 mm | 90.2 mm |
| Engine Compression Ratio | 9.6:1 | 11.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 218 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8.9 seconds | 5.2 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 | 930 kg | 1995 kg |
| Vehicle Length | 4710 mm | 5190 mm |
| Vehicle Width | 2010 mm | 1900 mm |
| Vehicle Height | 1430 mm | 1460 mm |
| Wheelbase Size | 2810 mm | 3080 mm |
| Fuel Consumption Overall | 7.4 L/100km | 13.8 L/100km |
| Fuel Tank Capacity | 65 L | 90 L |
