2007 BMW Z4 vs. 2009 Daihatsu Sirion
To start off, 2009 Daihatsu Sirion is newer by 2 year(s). Which means there will be less support and parts availability for 2007 BMW Z4. In addition, the cost of maintenance, including insurance, on 2007 BMW Z4 would be higher. At 2,996 cc (6 cylinders), 2007 BMW Z4 is equipped with a bigger engine. In terms of performance, 2007 BMW Z4 (255 HP @ 6600 RPM) has 186 more horse power than 2009 Daihatsu Sirion. (69 HP @ 6000 RPM). In normal driving conditions, 2007 BMW Z4 should accelerate faster than 2009 Daihatsu Sirion. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW Z4 weights approximately 508 kg more than 2009 Daihatsu Sirion. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 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 2007 BMW Z4. However, in wet, icy, snow, or gravel driving conditions, 2009 Daihatsu Sirion, 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, 2007 BMW Z4 (298 Nm @ 2750 RPM) has 204 more torque (in Nm) than 2009 Daihatsu Sirion. (94 Nm @ 3600 RPM). This means 2007 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2009 Daihatsu Sirion.
Compare all specifications:
| 2007 BMW Z4 | 2009 Daihatsu Sirion | |
| Make | BMW | Daihatsu |
| Model | Z4 | Sirion |
| Year Released | 2007 | 2009 |
| Body Type | Convertible | Hatchback |
| Engine Position | Front | Front |
| Engine Size | 2996 cc | 998 cc |
| Engine Cylinders | 6 cylinders | 3 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 255 HP | 69 HP |
| Engine RPM | 6600 RPM | 6000 RPM |
| Torque | 298 Nm | 94 Nm |
| Torque RPM | 2750 RPM | 3600 RPM |
| Engine Bore Size | 85 mm | 71.1 mm |
| Engine Stroke Size | 88 mm | 84 mm |
| Engine Compression Ratio | 10.7:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Acceleration 0-100mph | 5.9 seconds | 13.9 seconds |
| Drive Type | Rear | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1398 kg | 890 kg |
| Vehicle Length | 4100 mm | 3610 mm |
| Vehicle Width | 1790 mm | 1670 mm |
| Vehicle Height | 1300 mm | 1560 mm |
| Wheelbase Size | 2500 mm | 2440 mm |
| Fuel Consumption Overall | 9.8 L/100km | 5 L/100km |
| Fuel Tank Capacity | 55 L | 40 L |
