2003 BMW 645 vs. 2007 Opel Astra
To start off, 2007 Opel Astra is newer by 4 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 (325 HP @ 6100 RPM) has 207 more horse power than 2007 Opel Astra. (118 HP @ 3500 RPM). In normal driving conditions, 2003 BMW 645 should accelerate faster than 2007 Opel Astra. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 295 kg more than 2007 Opel Astra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2003 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2003 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2007 Opel Astra, being front wheel drive (FWD), will offer much better control with better grip. 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 170 more torque (in Nm) than 2007 Opel Astra. (280 Nm @ 2000 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Opel Astra.
Compare all specifications:
| 2003 BMW 645 | 2007 Opel Astra | |
| Make | BMW | Opel |
| Model | 645 | Astra |
| Year Released | 2003 | 2007 |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 1909 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 325 HP | 118 HP |
| Engine RPM | 6100 RPM | 3500 RPM |
| Torque | 450 Nm | 280 Nm |
| Torque RPM | 3600 RPM | 2000 RPM |
| Engine Bore Size | 92 mm | 82 mm |
| Engine Stroke Size | 82.7 mm | 90.4 mm |
| Engine Compression Ratio | 10.5:1 | 18.0:1 |
| Top Speed | 250 km/hour | 191 km/hour |
| Acceleration 0-100mph | 5.9 seconds | 10.5 seconds |
| Drive Type | Rear | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1690 kg | 1395 kg |
| Vehicle Length | 4830 mm | 4480 mm |
| Vehicle Width | 1860 mm | 2030 mm |
| Vehicle Height | 1380 mm | 1420 mm |
| Wheelbase Size | 2890 mm | 2620 mm |
| Fuel Consumption Overall | 11.7 L/100km | 6.1 L/100km |
| Fuel Tank Capacity | 70 L | 52 L |
