1991 Alfa Romeo SZ vs. 2006 BMW Z4
To start off, 2006 BMW Z4 is newer by 15 year(s). Which means there will be less support and parts availability for 1991 Alfa Romeo SZ. In addition, the cost of maintenance, including insurance, on 1991 Alfa Romeo SZ would be higher. At 2,959 cc (6 cylinders), 1991 Alfa Romeo SZ is equipped with a bigger engine. In terms of performance, 1991 Alfa Romeo SZ (208 HP @ 6200 RPM) has 19 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM). In normal driving conditions, 1991 Alfa Romeo SZ should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 75 kg more than 1991 Alfa Romeo SZ.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. 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, both vehicles can yield 245 Nm of torque. So under normal driving conditions, the ability to climb up hills and pull heavy equipment should be relatively similar for both vehicles.
Compare all specifications:
| 1991 Alfa Romeo SZ | 2006 BMW Z4 | |
| Make | Alfa Romeo | BMW |
| Model | SZ | Z4 |
| Year Released | 1991 | 2006 |
| Engine Position | Front | Front |
| Engine Size | 2959 cc | 2492 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 208 HP | 189 HP |
| Engine RPM | 6200 RPM | 6000 RPM |
| Torque | 245 Nm | 245 Nm |
| Torque RPM | 4500 RPM | 3500 RPM |
| Engine Bore Size | 93 mm | 84 mm |
| Engine Stroke Size | 72.6 mm | 75 mm |
| Engine Compression Ratio | 10.0:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 233 km/hour | 235 km/hour |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1260 kg | 1335 kg |
| Vehicle Length | 4670 mm | 4100 mm |
| Vehicle Width | 1740 mm | 1790 mm |
| Vehicle Height | 1320 mm | 1310 mm |
| Wheelbase Size | 2520 mm | 2500 mm |
| Fuel Tank Capacity | 50 L | 55 L |
