2008 BMW Z4 vs. 2009 BMW 650
To start off, 2009 BMW 650 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 BMW Z4. In addition, the cost of maintenance, including insurance, on 2008 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 (360 HP @ 6300 RPM) has 22 more horse power than 2008 BMW Z4. (338 HP @ 7900 RPM) In normal driving conditions, 2009 BMW 650 should accelerate faster than 2008 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2009 BMW 650 weights approximately 45 kg more than 2008 BMW Z4. 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, 2009 BMW 650 (488 Nm @ 3400 RPM) has 123 more torque (in Nm) than 2008 BMW Z4. (365 Nm @ 4900 RPM). This means 2009 BMW 650 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW Z4.
Compare all specifications:
| 2008 BMW Z4 | 2009 BMW 650 | |
| Make | BMW | BMW |
| Model | Z4 | 650 |
| Year Released | 2008 | 2009 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3246 cc | 4799 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 338 HP | 360 HP |
| Engine RPM | 7900 RPM | 6300 RPM |
| Torque | 365 Nm | 488 Nm |
| Torque RPM | 4900 RPM | 3400 RPM |
| Engine Bore Size | 91 mm | 93 mm |
| Engine Stroke Size | 87 mm | 88.3 mm |
| Engine Compression Ratio | 11.5:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5 seconds | 5.4 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1485 kg | 1530 kg |
| Vehicle Length | 4870 mm | 4830 mm |
| Vehicle Height | 1480 mm | 1860 mm |
| Wheelbase Size | 2500 mm | 2790 mm |
| Fuel Consumption Overall | 12.1 L/100km | 8.6 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
