2006 BMW Z4 vs. 1991 Opel Astra
To start off, 2006 BMW Z4 is newer by 15 year(s). Which means there will be less support and parts availability for 1991 Opel Astra. In addition, the cost of maintenance, including insurance, on 1991 Opel Astra would be higher. At 2,492 cc (6 cylinders), 2006 BMW Z4 is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (189 HP @ 6000 RPM) has 130 more horse power than 1991 Opel Astra. (59 HP @ 5200 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 1991 Opel Astra. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 375 kg more than 1991 Opel Astra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 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 2006 BMW Z4. However, in wet, icy, snow, or gravel driving conditions, 1991 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, 2006 BMW Z4 (245 Nm @ 3500 RPM) has 141 more torque (in Nm) than 1991 Opel Astra. (104 Nm @ 2800 RPM). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1991 Opel Astra.
Compare all specifications:
| 2006 BMW Z4 | 1991 Opel Astra | |
| Make | BMW | Opel |
| Model | Z4 | Astra |
| Year Released | 2006 | 1991 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 1389 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 189 HP | 59 HP |
| Engine RPM | 6000 RPM | 5200 RPM |
| Torque | 245 Nm | 104 Nm |
| Torque RPM | 3500 RPM | 2800 RPM |
| Engine Bore Size | 84 mm | 77.6 mm |
| Engine Stroke Size | 75 mm | 73.4 mm |
| Top Speed | 235 km/hour | 160 km/hour |
| Drive Type | Rear | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1335 kg | 960 kg |
| Vehicle Length | 4100 mm | 4250 mm |
| Vehicle Width | 1790 mm | 1690 mm |
| Vehicle Height | 1310 mm | 1430 mm |
| Wheelbase Size | 2500 mm | 2610 mm |
