2006 BMW Z4 vs. 2005 Fiat Siena
To start off, 2006 BMW Z4 is newer by 1 year(s). Which means there will be less support and parts availability for 2005 Fiat Siena. In addition, the cost of maintenance, including insurance, on 2005 Fiat Siena 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 119 more horse power than 2005 Fiat Siena. (70 HP @ 5750 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2005 Fiat Siena. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 315 kg more than 2005 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, 2005 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 150 more torque (in Nm) than 2005 Fiat Siena. (95 Nm @ 4000 RPM). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2005 Fiat Siena.
Compare all specifications:
| 2006 BMW Z4 | 2005 Fiat Siena | |
| Make | BMW | Fiat |
| Model | Z4 | Siena |
| Year Released | 2006 | 2005 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 999 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 189 HP | 70 HP |
| Engine RPM | 6000 RPM | 5750 RPM |
| Torque | 245 Nm | 95 Nm |
| Torque RPM | 3500 RPM | 4000 RPM |
| Fuel Type | Gasoline - Premium | Gasoline |
| 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 | 1020 kg |
| Vehicle Length | 4100 mm | 4110 mm |
| Vehicle Width | 1790 mm | 1630 mm |
| Vehicle Height | 1310 mm | 1470 mm |
| Wheelbase Size | 2500 mm | 2380 mm |
