2005 BMW Z4 vs. 2001 Opel Signum
To start off, 2005 BMW Z4 is newer by 4 year(s). Which means there will be less support and parts availability for 2001 Opel Signum. In addition, the cost of maintenance, including insurance, on 2001 Opel Signum would be higher. At 2,171 cc (6 cylinders), 2005 BMW Z4 is equipped with a bigger engine. In terms of performance, 2005 BMW Z4 (168 HP @ 6250 RPM) has 24 more horse power than 2001 Opel Signum. (144 HP @ 4000 RPM). In normal driving conditions, 2005 BMW Z4 should accelerate faster than 2001 Opel Signum. With that said, vehicle weight also plays an important factor in acceleration. 2001 Opel Signum weights approximately 73 kg more than 2005 BMW Z4.
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, 2001 Opel Signum, 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, 2001 Opel Signum (220 Nm @ 2000 RPM) has 10 more torque (in Nm) than 2005 BMW Z4. (210 Nm @ 3500 RPM). This means 2001 Opel Signum will have an easier job in driving up hills or pulling heavy equipment than 2005 BMW Z4.
Compare all specifications:
| 2005 BMW Z4 | 2001 Opel Signum | |
| Make | BMW | Opel |
| Model | Z4 | Signum |
| Year Released | 2005 | 2001 |
| Body Type | Convertible | Hatchback |
| Engine Position | Front | Front |
| Engine Size | 2171 cc | 1994 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 168 HP | 144 HP |
| Engine RPM | 6250 RPM | 4000 RPM |
| Torque | 210 Nm | 220 Nm |
| Torque RPM | 3500 RPM | 2000 RPM |
| Engine Bore Size | 80 mm | 82 mm |
| Engine Stroke Size | 72 mm | 90.4 mm |
| Engine Compression Ratio | 10.8:1 | 18.0:1 |
| Top Speed | 225 km/hour | 209 km/hour |
| Acceleration 0-100mph | 7.7 seconds | 10.5 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 | 1325 kg | 1398 kg |
| Vehicle Length | 4100 mm | 4640 mm |
| Vehicle Width | 1790 mm | 1800 mm |
| Vehicle Height | 1310 mm | 1470 mm |
| Wheelbase Size | 2500 mm | 2850 mm |
| Fuel Tank Capacity | 55 L | 60 L |
