2007 BMW 630 vs. 2006 BMW 645
To start off, 2007 BMW 630 is newer by 1 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 73 more horse power than 2007 BMW 630. (255 HP @ 6600 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 2007 BMW 630. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW 630 weights approximately 68 kg more than 2006 BMW 645.
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 645 (450 Nm @ 3600 RPM) has 150 more torque (in Nm) than 2007 BMW 630. (300 Nm @ 2500 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 BMW 630.
Compare all specifications:
| 2007 BMW 630 | 2006 BMW 645 | |
| Make | BMW | BMW |
| Model | 630 | 645 |
| Year Released | 2007 | 2006 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2996 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 255 HP | 328 HP |
| Engine RPM | 6600 RPM | 6100 RPM |
| Torque | 300 Nm | 450 Nm |
| Torque RPM | 2500 RPM | 3600 RPM |
| Engine Bore Size | 85 mm | 92 mm |
| Engine Stroke Size | 88 mm | 82.7 mm |
| Engine Compression Ratio | 10.7:1 | 10.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.9 seconds | 5.6 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1760 kg | 1692 kg |
| Vehicle Length | 4830 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1380 mm |
| Wheelbase Size | 2790 mm | 2790 mm |
| Fuel Consumption Overall | 9.6 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
