2003 Alfa Romeo Spider vs. 2006 BMW Z4
To start off, 2006 BMW Z4 is newer by 3 year(s). Which means there will be less support and parts availability for 2003 Alfa Romeo Spider. In addition, the cost of maintenance, including insurance, on 2003 Alfa Romeo Spider would be higher. At 3,179 cc (6 cylinders), 2003 Alfa Romeo Spider is equipped with a bigger engine. In terms of performance, 2003 Alfa Romeo Spider (248 HP @ 6300 RPM) has 59 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM). In normal driving conditions, 2003 Alfa Romeo Spider should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2003 Alfa Romeo Spider weights approximately 155 kg more than 2006 BMW Z4. 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, 2003 Alfa Romeo Spider, 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, 2003 Alfa Romeo Spider (305 Nm @ 4800 RPM) has 60 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2003 Alfa Romeo Spider will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4.
Compare all specifications:
| 2003 Alfa Romeo Spider | 2006 BMW Z4 | |
| Make | Alfa Romeo | BMW |
| Model | Spider | Z4 |
| Year Released | 2003 | 2006 |
| Body Type | Roadster | Convertible |
| Engine Position | Front | Front |
| Engine Size | 3179 cc | 2492 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 248 HP | 189 HP |
| Engine RPM | 6300 RPM | 6000 RPM |
| Torque | 305 Nm | 245 Nm |
| Torque RPM | 4800 RPM | 3500 RPM |
| Engine Bore Size | 93 mm | 84 mm |
| Engine Stroke Size | 78 mm | 75 mm |
| Engine Compression Ratio | 10.3:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Acceleration 0-100mph | 6.3 seconds | 7 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1490 kg | 1335 kg |
| Vehicle Length | 4310 mm | 4100 mm |
| Vehicle Width | 1780 mm | 1790 mm |
| Vehicle Height | 1330 mm | 1310 mm |
| Wheelbase Size | 2600 mm | 2500 mm |
| Fuel Consumption Overall | 13.2 L/100km | 9 L/100km |
| Fuel Tank Capacity | 70 L | 55 L |
