2006 Fiat Siena vs. 2012 BMW Z4
To start off, 2012 BMW Z4 is newer by 6 year(s). Which means there will be less support and parts availability for 2006 Fiat Siena. In addition, the cost of maintenance, including insurance, on 2006 Fiat Siena would be higher. At 1,997 cc (4 cylinders), 2012 BMW Z4 is equipped with a bigger engine. In terms of performance, 2012 BMW Z4 (244 HP @ 5000 RPM) has 172 more horse power than 2006 Fiat Siena. (72 HP @ 6000 RPM) In normal driving conditions, 2012 BMW Z4 should accelerate faster than 2006 Fiat Siena. With that said, vehicle weight also plays an important factor in acceleration. 2012 BMW Z4 weights approximately 320 kg more than 2006 Fiat Siena. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2012 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 2012 BMW Z4. However, in wet, icy, snow, or gravel driving conditions, 2006 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, 2012 BMW Z4 (350 Nm @ 1500 RPM) has 248 more torque (in Nm) than 2006 Fiat Siena. (102 Nm @ 3250 RPM). This means 2012 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2006 Fiat Siena.
Compare all specifications:
| 2006 Fiat Siena | 2012 BMW Z4 | |
| Make | Fiat | BMW |
| Model | Siena | Z4 |
| Year Released | 2006 | 2012 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 1242 cc | 1997 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 72 HP | 244 HP |
| Engine RPM | 6000 RPM | 5000 RPM |
| Torque | 102 Nm | 350 Nm |
| Torque RPM | 3250 RPM | 1500 RPM |
| Engine Bore Size | 70.8 mm | 90.1 mm |
| Engine Stroke Size | 78.8 mm | 84 mm |
| Top Speed | 164 km/hour | 250 km/hour |
| Acceleration 0-100mph | 13.5 seconds | 5.7 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1170 kg | 1490 kg |
| Vehicle Length | 3830 mm | 4239 mm |
| Vehicle Width | 1640 mm | 1791 mm |
| Vehicle Height | 1440 mm | 1290 mm |
| Wheelbase Size | 2380 mm | 2497 mm |
| Fuel Consumption Overall | 7.8 L/100km | 6.8 L/100km |
| Fuel Tank Capacity | 54 L | 55 L |
