2006 BMW Z4 vs. 2005 BMW 730
To start off, 2006 BMW Z4 is newer by 1 year(s). Which means there will be less support and parts availability for 2005 BMW 730. In addition, the cost of maintenance, including insurance, on 2005 BMW 730 would be higher. At 2,979 cc (6 cylinders), 2005 BMW 730 is equipped with a bigger engine. In terms of performance, 2005 BMW 730 (225 HP @ 4000 RPM) has 36 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM) In normal driving conditions, 2005 BMW 730 should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 730 weights approximately 640 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, 2005 BMW 730 (500 Nm @ 2000 RPM) has 255 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2005 BMW 730 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4. 2005 BMW 730 has automatic transmission and 2006 BMW Z4 has manual transmission. 2006 BMW Z4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2005 BMW 730 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2006 BMW Z4 | 2005 BMW 730 | |
| Make | BMW | BMW |
| Model | Z4 | 730 |
| Year Released | 2006 | 2005 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 2979 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 225 HP |
| Engine RPM | 6000 RPM | 4000 RPM |
| Torque | 245 Nm | 500 Nm |
| Torque RPM | 3500 RPM | 2000 RPM |
| Engine Bore Size | 84 mm | 84.1 mm |
| Engine Stroke Size | 75 mm | 90 mm |
| Engine Compression Ratio | 11.0:1 | 18.0:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Acceleration 0-100mph | 7 seconds | 8 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1335 kg | 1975 kg |
| Vehicle Length | 4100 mm | 5050 mm |
| Vehicle Width | 1790 mm | 1910 mm |
| Vehicle Height | 1310 mm | 1500 mm |
| Wheelbase Size | 2500 mm | 2890 mm |
| Fuel Consumption Overall | 9 L/100km | 8.2 L/100km |
| Fuel Tank Capacity | 55 L | 88 L |
