2009 Audi Q7 vs. 2003 BMW 645
To start off, 2009 Audi Q7 is newer by 6 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2003 BMW 645 (310 HP @ 6000 RPM) has 73 more horse power than 2009 Audi Q7. (237 HP @ 4000 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 2009 Audi Q7. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi Q7 weights approximately 672 kg more than 2003 BMW 645.
Because 2009 Audi Q7 is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 2009 Audi Q7 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 Q7 (550 Nm @ 2000 RPM) has 100 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2009 Audi Q7 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2009 Audi Q7 | 2003 BMW 645 | |
| Make | Audi | BMW |
| Model | Q7 | 645 |
| Year Released | 2009 | 2003 |
| Body Type | SUV | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2967 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 237 HP | 310 HP |
| Engine RPM | 4000 RPM | 6000 RPM |
| Torque | 550 Nm | 450 Nm |
| Torque RPM | 2000 RPM | 3600 RPM |
| Engine Bore Size | 83.1 mm | 92 mm |
| Engine Stroke Size | 91.4 mm | 82.7 mm |
| Engine Compression Ratio | 17.0:1 | 10.5:1 |
| Acceleration 0-100mph | 8.5 seconds | 5.9 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 2370 kg | 1698 kg |
| Vehicle Length | 5090 mm | 4830 mm |
| Vehicle Width | 1990 mm | 1860 mm |
| Vehicle Height | 1740 mm | 1380 mm |
| Wheelbase Size | 3010 mm | 2790 mm |
| Fuel Consumption Overall | 9.8 L/100km | 10.9 L/100km |
| Fuel Tank Capacity | 100 L | 70 L |
