2003 Fiat Siena vs. 2005 Opel Vectra
To start off, 2005 Opel Vectra is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Fiat Siena. In addition, the cost of maintenance, including insurance, on 2003 Fiat Siena would be higher. At 3,175 cc (6 cylinders), 2005 Opel Vectra is equipped with a bigger engine. In terms of performance, 2005 Opel Vectra (208 HP @ 6200 RPM) has 109 more horse power than 2003 Fiat Siena. (99 HP @ 6000 RPM) In normal driving conditions, 2005 Opel Vectra should accelerate faster than 2003 Fiat Siena. With that said, vehicle weight also plays an important factor in acceleration. 2005 Opel Vectra weights approximately 150 kg more than 2003 Fiat Siena. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than rear 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 Opel Vectra (300 Nm @ 4000 RPM) has 154 more torque (in Nm) than 2003 Fiat Siena. (146 Nm @ 4000 RPM). This means 2005 Opel Vectra will have an easier job in driving up hills or pulling heavy equipment than 2003 Fiat Siena.
Compare all specifications:
| 2003 Fiat Siena | 2005 Opel Vectra | |
| Make | Fiat | Opel |
| Model | Siena | Vectra |
| Year Released | 2003 | 2005 |
| Engine Position | Front | Front |
| Engine Size | 1596 cc | 3175 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 99 HP | 208 HP |
| Engine RPM | 6000 RPM | 6200 RPM |
| Torque | 146 Nm | 300 Nm |
| Torque RPM | 4000 RPM | 4000 RPM |
| Engine Bore Size | 80.5 mm | 87.5 mm |
| Engine Stroke Size | 78.4 mm | 88 mm |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1050 kg | 1200 kg |
| Vehicle Length | 4110 mm | 4600 mm |
| Vehicle Width | 1630 mm | 1800 mm |
| Vehicle Height | 1470 mm | 1470 mm |
| Wheelbase Size | 2380 mm | 2500 mm |
