2009 Daihatsu Sirion vs. 2006 BMW 645
To start off, 2009 Daihatsu Sirion is newer by 3 year(s). Which means there will be less support and parts availability for 2006 BMW 645. In addition, the cost of maintenance, including insurance, on 2006 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 226 more horse power than 2009 Daihatsu Sirion. (102 HP @ 6000 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 2009 Daihatsu Sirion. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 909 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 2009 Daihatsu Sirion is four wheel drive (4WD), it will have significant more traction and grip than 2006 BMW 645. In wet, icy, snow, or gravel driving conditions, 2009 Daihatsu Sirion will offer significantly more control. 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 645 (450 Nm @ 3600 RPM) has 312 more torque (in Nm) than 2009 Daihatsu Sirion. (138 Nm @ 4400 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2009 Daihatsu Sirion.
Compare all specifications:
| 2009 Daihatsu Sirion | 2006 BMW 645 | |
| Make | Daihatsu | BMW |
| Model | Sirion | 645 |
| Year Released | 2009 | 2006 |
| Body Type | Hatchback | Convertible |
| Engine Position | Front | Front |
| Engine Size | 1495 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 102 HP | 328 HP |
| Engine RPM | 6000 RPM | 6100 RPM |
| Torque | 138 Nm | 450 Nm |
| Torque RPM | 4400 RPM | 3600 RPM |
| Engine Bore Size | 72 mm | 92 mm |
| Engine Stroke Size | 91.8 mm | 82.7 mm |
| Engine Compression Ratio | 10.0:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 180 km/hour | 250 km/hour |
| Acceleration 0-100mph | 11.1 seconds | 6.4 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 906 kg | 1815 kg |
| Vehicle Length | 3640 mm | 4830 mm |
| Vehicle Width | 1670 mm | 1860 mm |
| Vehicle Height | 1560 mm | 1380 mm |
| Wheelbase Size | 2440 mm | 2790 mm |
| Fuel Consumption Overall | 6.7 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 40 L | 70 L |
