2004 BMW Z4 vs. 1991 Opel Calibra
To start off, 2004 BMW Z4 is newer by 13 year(s). Which means there will be less support and parts availability for 1991 Opel Calibra. In addition, the cost of maintenance, including insurance, on 1991 Opel Calibra would be higher. At 2,171 cc (6 cylinders), 2004 BMW Z4 is equipped with a bigger engine. In terms of performance, 1991 Opel Calibra (201 HP @ 5600 RPM) has 33 more horse power than 2004 BMW Z4. (168 HP @ 6250 RPM) In normal driving conditions, 1991 Opel Calibra should accelerate faster than 2004 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 1991 Opel Calibra weights approximately 98 kg more than 2004 BMW Z4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 1991 Opel Calibra is four wheel drive (4WD), it will have significant more traction and grip than 2004 BMW Z4. In wet, icy, snow, or gravel driving conditions, 1991 Opel Calibra 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, 1991 Opel Calibra (280 Nm @ 2400 RPM) has 70 more torque (in Nm) than 2004 BMW Z4. (210 Nm @ 3500 RPM). This means 1991 Opel Calibra will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW Z4.
Compare all specifications:
| 2004 BMW Z4 | 1991 Opel Calibra | |
| Make | BMW | Opel |
| Model | Z4 | Calibra |
| Year Released | 2004 | 1991 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2171 cc | 1998 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 168 HP | 201 HP |
| Engine RPM | 6250 RPM | 5600 RPM |
| Torque | 210 Nm | 280 Nm |
| Torque RPM | 3500 RPM | 2400 RPM |
| Engine Compression Ratio | 10.8:1 | 9.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 220 km/hour | 241 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1325 kg | 1423 kg |
| Vehicle Length | 4100 mm | 4500 mm |
| Vehicle Width | 1790 mm | 1700 mm |
| Vehicle Height | 1310 mm | 1610 mm |
| Wheelbase Size | 2500 mm | 2450 mm |
| Fuel Consumption Overall | 8.9 L/100km | 7.5 L/100km |
| Fuel Tank Capacity | 55 L | 40 L |
