2006 BMW Z4 vs. 2007 BMW 550
To start off, 2007 BMW 550 is newer by 1 year(s). Which means there will be less support and parts availability for 2006 BMW Z4. In addition, the cost of maintenance, including insurance, on 2006 BMW Z4 would be higher. At 2,497 cc (8 cylinders), 2007 BMW 550 is equipped with a bigger engine. In terms of performance, 2007 BMW 550 (362 HP @ 6300 RPM) has 173 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM) In normal driving conditions, 2007 BMW 550 should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW 550 weights approximately 325 kg more than 2006 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, 2007 BMW 550 (491 Nm @ 3400 RPM) has 246 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2007 BMW 550 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4.
Compare all specifications:
| 2006 BMW Z4 | 2007 BMW 550 | |
| Make | BMW | BMW |
| Model | Z4 | 550 |
| Year Released | 2006 | 2007 |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 2497 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 362 HP |
| Engine RPM | 6000 RPM | 6300 RPM |
| Torque | 245 Nm | 491 Nm |
| Torque RPM | 3500 RPM | 3400 RPM |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 235 km/hour | 235 km/hour |
| Acceleration 0-100mph | 7 seconds | 5.9 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1335 kg | 1660 kg |
| Vehicle Length | 4100 mm | 4850 mm |
| Vehicle Width | 1790 mm | 1490 mm |
| Vehicle Height | 1310 mm | 1850 mm |
| Wheelbase Size | 2500 mm | 2890 mm |
| Fuel Consumption Overall | 9 L/100km | 11.1 L/100km |
| Fuel Tank Capacity | 55 L | 70 L |
