2007 BMW Z4 vs. 2003 Mazda Roadster
To start off, 2007 BMW Z4 is newer by 4 year(s). Which means there will be less support and parts availability for 2003 Mazda Roadster. In addition, the cost of maintenance, including insurance, on 2003 Mazda Roadster would be higher. At 3,246 cc (6 cylinders), 2007 BMW Z4 is equipped with a bigger engine. In terms of performance, 2007 BMW Z4 (338 HP @ 7900 RPM) has 181 more horse power than 2003 Mazda Roadster. (157 HP @ 7000 RPM). In normal driving conditions, 2007 BMW Z4 should accelerate faster than 2003 Mazda Roadster. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW Z4 weights approximately 425 kg more than 2003 Mazda Roadster. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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, 2007 BMW Z4 (365 Nm @ 4900 RPM) has 195 more torque (in Nm) than 2003 Mazda Roadster. (170 Nm @ 5500 RPM). This means 2007 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2003 Mazda Roadster.
Compare all specifications:
| 2007 BMW Z4 | 2003 Mazda Roadster | |
| Make | BMW | Mazda |
| Model | Z4 | Roadster |
| Year Released | 2007 | 2003 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 3246 cc | 1839 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 338 HP | 157 HP |
| Engine RPM | 7900 RPM | 7000 RPM |
| Torque | 365 Nm | 170 Nm |
| Torque RPM | 4900 RPM | 5500 RPM |
| Engine Bore Size | 87 mm | 83 mm |
| Engine Stroke Size | 91 mm | 85 mm |
| Engine Compression Ratio | 11.5:1 | 10.5:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1485 kg | 1060 kg |
| Vehicle Length | 4120 mm | 3960 mm |
| Vehicle Width | 1790 mm | 1690 mm |
| Vehicle Height | 1310 mm | 1240 mm |
| Wheelbase Size | 2500 mm | 2370 mm |
| Fuel Tank Capacity | 55 L | 48 L |
