2005 BMW 645 vs. 2008 BMW 730
To start off, 2008 BMW 730 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 BMW 645. In addition, the cost of maintenance, including insurance, on 2005 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 72 more horse power than 2008 BMW 730. (254 HP @ 6600 RPM). In normal driving conditions, 2005 BMW 645 should accelerate faster than 2008 BMW 730. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 75 kg more than 2008 BMW 730. 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, 2005 BMW 645 (447 Nm @ 3600 RPM) has 147 more torque (in Nm) than 2008 BMW 730. (300 Nm @ 2500 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW 730. 2008 BMW 730 has automatic transmission and 2005 BMW 645 has manual transmission. 2005 BMW 645 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 BMW 730 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 BMW 645 | 2008 BMW 730 | |
| Make | BMW | BMW |
| Model | 645 | 730 |
| Year Released | 2005 | 2008 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 2995 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 326 HP | 254 HP |
| Engine RPM | 6100 RPM | 6600 RPM |
| Torque | 447 Nm | 300 Nm |
| Torque RPM | 3600 RPM | 2500 RPM |
| Engine Compression Ratio | 10.5:1 | 10.7:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 244 km/hour |
| Acceleration 0-100mph | 6.1 seconds | 7.9 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 1820 kg |
| Vehicle Length | 4830 mm | 5180 mm |
| Vehicle Width | 1860 mm | 1910 mm |
| Vehicle Height | 1380 mm | 1500 mm |
| Wheelbase Size | 2890 mm | 3140 mm |
| Fuel Consumption Overall | 12.8 L/100km | 10.1 L/100km |
| Fuel Tank Capacity | 70 L | 88 L |
