2009 Audi A8 vs. 2008 BMW Z4
To start off, 2009 Audi A8 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 BMW Z4. In addition, the cost of maintenance, including insurance, on 2008 BMW Z4 would be higher. At 2,994 cc (6 cylinders), 2008 BMW Z4 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (229 HP @ 4000 RPM) has 14 more horse power than 2008 BMW Z4. (215 HP @ 6250 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2008 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 435 kg more than 2008 BMW Z4. 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 2008 BMW Z4. 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 (450 Nm @ 1400 RPM) has 199 more torque (in Nm) than 2008 BMW Z4. (251 Nm @ 2750 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW Z4. 2009 Audi A8 has automatic transmission and 2008 BMW Z4 has manual transmission. 2008 BMW Z4 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 | 2008 BMW Z4 | |
| Make | Audi | BMW |
| Model | A8 | Z4 |
| Year Released | 2009 | 2008 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2966 cc | 2994 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 229 HP | 215 HP |
| Engine RPM | 4000 RPM | 6250 RPM |
| Torque | 450 Nm | 251 Nm |
| Torque RPM | 1400 RPM | 2750 RPM |
| Engine Bore Size | 83 mm | 85.1 mm |
| Engine Stroke Size | 91.4 mm | 88.1 mm |
| Engine Compression Ratio | 17.0:1 | 10.7:1 |
| Fuel Type | Diesel | Gasoline |
| Top Speed | 243 km/hour | 250 km/hour |
| Acceleration 0-100mph | 7.8 seconds | 5.9 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1830 kg | 1395 kg |
| Vehicle Height | 1900 mm | 1300 mm |
| Wheelbase Size | 2950 mm | 2500 mm |
| Fuel Consumption Overall | 8.4 L/100km | 11.2 L/100km |
| Fuel Tank Capacity | 90 L | 55 L |
