2009 Audi R8 vs. 2004 BMW 645
To start off, 2009 Audi R8 is newer by 5 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 5,204 cc (10 cylinders), 2009 Audi R8 is equipped with a bigger engine. In terms of performance, 2009 Audi R8 (518 HP @ 8000 RPM) has 190 more horse power than 2004 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2009 Audi R8 should accelerate faster than 2004 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 110 kg more than 2009 Audi R8.
Because 2009 Audi R8 is all wheel drive (AWD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 2009 Audi R8 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 R8 (530 Nm @ 6500 RPM) has 80 more torque (in Nm) than 2004 BMW 645. (450 Nm @ 3600 RPM). This means 2009 Audi R8 will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW 645.
Compare all specifications:
| 2009 Audi R8 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | R8 | 645 |
| Year Released | 2009 | 2004 |
| Body Type | Coupe | Coupe |
| Engine Position | Middle | Front |
| Engine Size | 5204 cc | 4398 cc |
| Engine Cylinders | 10 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 518 HP | 328 HP |
| Engine RPM | 8000 RPM | 6100 RPM |
| Torque | 530 Nm | 450 Nm |
| Torque RPM | 6500 RPM | 3600 RPM |
| Engine Compression Ratio | 12.5:1 | 10.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 311 km/hour | 250 km/hour |
| Acceleration 0-100mph | 3.9 seconds | 5.6 seconds |
| Drive Type | AWD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1580 kg | 1690 kg |
| Vehicle Length | 4440 mm | 4830 mm |
| Vehicle Width | 1940 mm | 1860 mm |
| Vehicle Height | 1260 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2830 mm |
| Fuel Consumption Overall | 15.7 L/100km | 12 L/100km |
| Fuel Tank Capacity | 75 L | 70 L |
