2006 BMW X5 vs. 2006 BMW 645
To start off, both 2006 BMW X5 and 2006 BMW 645 were released in the same year (2006). Therefore the support and the availability on parts for both vehicles should be relatively similar. 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 100 more horse power than 2006 BMW X5. (228 HP @ 3500 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 2006 BMW X5. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 206 kg more than 2006 BMW X5. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 BMW X5 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, 2006 BMW X5 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 150 more torque (in Nm) than 2006 BMW X5. (300 Nm @ 3500 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW X5.
Compare all specifications:
| 2006 BMW X5 | 2006 BMW 645 | |
| Make | BMW | BMW |
| Model | X5 | 645 |
| Year Released | 2006 | 2006 |
| Body Type | SUV | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2979 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 228 HP | 328 HP |
| Engine RPM | 3500 RPM | 6100 RPM |
| Torque | 300 Nm | 450 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 89.6 mm | 83 mm |
| Engine Compression Ratio | 10.2:1 | 10.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 202 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8.5 seconds | 6.1 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1630 kg | 1836 kg |
| Vehicle Length | 4670 mm | 4830 mm |
| Vehicle Width | 1880 mm | 1860 mm |
| Vehicle Height | 1720 mm | 1380 mm |
| Wheelbase Size | 2830 mm | 2790 mm |
| Fuel Consumption Overall | 12.7 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 93 L | 70 L |
