2007 BMW Z4 vs. 2009 BMW 650
To start off, 2009 BMW 650 is newer by 2 year(s). Which means there will be less support and parts availability for 2007 BMW Z4. In addition, the cost of maintenance, including insurance, on 2007 BMW Z4 would be higher. At 4,799 cc (8 cylinders), 2009 BMW 650 is equipped with a bigger engine. In terms of performance, 2009 BMW 650 (362 HP @ 6300 RPM) has 4 more horse power than 2007 BMW Z4. (358 HP @ 7900 RPM) In normal driving conditions, 2009 BMW 650 should accelerate faster than 2007 BMW Z4.
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, 2009 BMW 650 (490 Nm @ 3400 RPM) has 105 more torque (in Nm) than 2007 BMW Z4. (385 Nm @ 4900 RPM). This means 2009 BMW 650 will have an easier job in driving up hills or pulling heavy equipment than 2007 BMW Z4.
Compare all specifications:
| 2007 BMW Z4 | 2009 BMW 650 | |
| Make | BMW | BMW |
| Model | Z4 | 650 |
| Year Released | 2007 | 2009 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3199 cc | 4799 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 358 HP | 362 HP |
| Engine RPM | 7900 RPM | 6300 RPM |
| Torque | 385 Nm | 490 Nm |
| Torque RPM | 4900 RPM | 3400 RPM |
| Engine Compression Ratio | 11.5:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline |
| Top Speed | 273 km/hour | 250 km/hour |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Length | 4100 mm | 4830 mm |
| Vehicle Width | 1790 mm | 1380 mm |
| Vehicle Height | 1300 mm | 1860 mm |
| Wheelbase Size | 2500 mm | 2790 mm |
