2006 BMW Z4 vs. 2003 Smart Roadster
To start off, 2006 BMW Z4 is newer by 3 year(s). Which means there will be less support and parts availability for 2003 Smart Roadster. In addition, the cost of maintenance, including insurance, on 2003 Smart Roadster 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 89 more horse power than 2003 Smart Roadster. (100 HP @ 5250 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2003 Smart Roadster.
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, 2006 BMW Z4 (245 Nm @ 3500 RPM) has 115 more torque (in Nm) than 2003 Smart Roadster. (130 Nm @ 2500 RPM). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2003 Smart Roadster.
Compare all specifications:
| 2006 BMW Z4 | 2003 Smart Roadster | |
| Make | BMW | Smart |
| Model | Z4 | Roadster |
| Year Released | 2006 | 2003 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Rear |
| Engine Size | 2492 cc | 698 cc |
| Engine Cylinders | 6 cylinders | 3 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 189 HP | 100 HP |
| Engine RPM | 6000 RPM | 5250 RPM |
| Torque | 245 Nm | 130 Nm |
| Torque RPM | 3500 RPM | 2500 RPM |
| Engine Compression Ratio | 11.0:1 | 9.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 235 km/hour | 190 km/hour |
| Acceleration 0-100mph | 7 seconds | 9.8 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Length | 4100 mm | 3430 mm |
| Vehicle Width | 1790 mm | 1620 mm |
| Vehicle Height | 1310 mm | 1200 mm |
| Wheelbase Size | 2500 mm | 2370 mm |
| Fuel Consumption Overall | 9 L/100km | 5.3 L/100km |
| Fuel Tank Capacity | 55 L | 35 L |
