2009 BMW M3 vs. 2008 BMW 645
To start off, 2009 BMW M3 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 BMW 645. In addition, the cost of maintenance, including insurance, on 2008 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2008 BMW 645 is equipped with a bigger engine. In terms of performance, 2009 BMW M3 (414 HP @ 8300 RPM) has 86 more horse power than 2008 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2009 BMW M3 should accelerate faster than 2008 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2008 BMW 645 weights approximately 370 kg more than 2009 BMW M3.
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, 2008 BMW 645 (450 Nm @ 3600 RPM) has 49 more torque (in Nm) than 2009 BMW M3. (401 Nm @ 3900 RPM). This means 2008 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW M3.
Compare all specifications:
| 2009 BMW M3 | 2008 BMW 645 | |
| Make | BMW | BMW |
| Model | M3 | 645 |
| Year Released | 2009 | 2008 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3999 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 414 HP | 328 HP |
| Engine RPM | 8300 RPM | 6100 RPM |
| Torque | 401 Nm | 450 Nm |
| Torque RPM | 3900 RPM | 3600 RPM |
| Engine Bore Size | 92 mm | 92.1 mm |
| Engine Stroke Size | 75.2 mm | 82.7 mm |
| Fuel Type | Gasoline | Gasoline - Premium |
| Acceleration 0-100mph | 5.1 seconds | 5.6 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1320 kg | 1690 kg |
| Vehicle Length | 4620 mm | 4830 mm |
| Vehicle Width | 1400 mm | 1860 mm |
| Vehicle Height | 1810 mm | 1380 mm |
| Wheelbase Size | 2770 mm | 2790 mm |
| Fuel Consumption Overall | 12.3 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
