2005 BMW Z4 vs. 2003 Opel Astra
To start off, 2005 BMW Z4 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Opel Astra. In addition, the cost of maintenance, including insurance, on 2003 Opel Astra would be higher. At 2,489 cc (6 cylinders), 2005 BMW Z4 is equipped with a bigger engine. In terms of performance, 2005 BMW Z4 (184 HP @ 6100 RPM) has 61 more horse power than 2003 Opel Astra. (123 HP @ 5600 RPM). In normal driving conditions, 2005 BMW Z4 should accelerate faster than 2003 Opel Astra. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW Z4 weights approximately 280 kg more than 2003 Opel Astra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 BMW Z4 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 2005 BMW Z4. However, in wet, icy, snow, or gravel driving conditions, 2003 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, 2005 BMW Z4 (237 Nm @ 3500 RPM) has 64 more torque (in Nm) than 2003 Opel Astra. (173 Nm @ 3800 RPM). This means 2005 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2003 Opel Astra.
Compare all specifications:
| 2005 BMW Z4 | 2003 Opel Astra | |
| Make | BMW | Opel |
| Model | Z4 | Astra |
| Year Released | 2005 | 2003 |
| Engine Position | Front | Front |
| Engine Size | 2489 cc | 1796 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 184 HP | 123 HP |
| Engine RPM | 6100 RPM | 5600 RPM |
| Torque | 237 Nm | 173 Nm |
| Torque RPM | 3500 RPM | 3800 RPM |
| Engine Bore Size | 84 mm | 80.5 mm |
| Engine Stroke Size | 75 mm | 88.2 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 235 km/hour | 198 km/hour |
| Acceleration 0-100mph | 7 seconds | 11.1 seconds |
| Drive Type | Rear | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1395 kg | 1115 kg |
| Vehicle Length | 4100 mm | 4260 mm |
| Vehicle Width | 1790 mm | 1760 mm |
| Vehicle Height | 1310 mm | 1470 mm |
| Wheelbase Size | 2500 mm | 2640 mm |
| Fuel Consumption Highway | 8.4 L/100km | 6.2 L/100km |
| Fuel Consumption City | 11.8 L/100km | 10.5 L/100km |
| Fuel Consumption Overall | 9 L/100km | 7.8 L/100km |
| Fuel Tank Capacity | 55 L | 53 L |
