2006 BMW Z4 vs. 2007 Fiat Siena
To start off, 2007 Fiat Siena 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 2,492 cc (6 cylinders), 2006 BMW Z4 is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (189 HP @ 6000 RPM) has 121 more horse power than 2007 Fiat Siena. (68 HP @ 4600 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2007 Fiat Siena. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 245 kg more than 2007 Fiat Siena. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 BMW Z4 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2006 BMW Z4. However, in wet, icy, snow, or gravel driving conditions, 2007 Fiat Siena, being front wheel drive (FWD), will offer much better control with better grip. 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, 2006 BMW Z4 (245 Nm @ 3500 RPM) has 110 more torque (in Nm) than 2007 Fiat Siena. (135 Nm @ 2500 RPM). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2007 Fiat Siena.
Compare all specifications:
| 2006 BMW Z4 | 2007 Fiat Siena | |
| Make | BMW | Fiat |
| Model | Z4 | Siena |
| Year Released | 2006 | 2007 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 1697 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 189 HP | 68 HP |
| Engine RPM | 6000 RPM | 4600 RPM |
| Torque | 245 Nm | 135 Nm |
| Torque RPM | 3500 RPM | 2500 RPM |
| Engine Compression Ratio | 11.0:1 | 20.3:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Top Speed | 235 km/hour | 160 km/hour |
| Acceleration 0-100mph | 7 seconds | 16.3 seconds |
| Drive Type | Rear | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1335 kg | 1090 kg |
| Vehicle Length | 4100 mm | 4140 mm |
| Vehicle Width | 1790 mm | 1640 mm |
| Vehicle Height | 1310 mm | 1440 mm |
| Wheelbase Size | 2500 mm | 2380 mm |
| Fuel Consumption Overall | 9 L/100km | 6.9 L/100km |
| Fuel Tank Capacity | 55 L | 47 L |
