2007 Alfa Romeo 166 vs. 2003 Fiat Siena
To start off, 2007 Alfa Romeo 166 is newer by 4 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 3,179 cc (6 cylinders), 2007 Alfa Romeo 166 is equipped with a bigger engine. In terms of performance, 2007 Alfa Romeo 166 (236 HP @ 6200 RPM) has 167 more horse power than 2003 Fiat Siena. (69 HP @ 4500 RPM). In normal driving conditions, 2007 Alfa Romeo 166 should accelerate faster than 2003 Fiat Siena. With that said, vehicle weight also plays an important factor in acceleration. 2007 Alfa Romeo 166 weights approximately 442 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, 2007 Alfa Romeo 166 (289 Nm @ 4800 RPM) has 161 more torque (in Nm) than 2003 Fiat Siena. (128 Nm @ 2500 RPM). This means 2007 Alfa Romeo 166 will have an easier job in driving up hills or pulling heavy equipment than 2003 Fiat Siena.
Compare all specifications:
| 2007 Alfa Romeo 166 | 2003 Fiat Siena | |
| Make | Alfa Romeo | Fiat |
| Model | 166 | Siena |
| Year Released | 2007 | 2003 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3179 cc | 1747 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 236 HP | 69 HP |
| Engine RPM | 6200 RPM | 4500 RPM |
| Torque | 289 Nm | 128 Nm |
| Torque RPM | 4800 RPM | 2500 RPM |
| Engine Bore Size | 93 mm | 82.7 mm |
| Engine Stroke Size | 78 mm | 79.2 mm |
| Engine Compression Ratio | 10.5:1 | 20.3:1 |
| Fuel Type | Gasoline | Diesel |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1542 kg | 1100 kg |
| Vehicle Length | 4730 mm | 4110 mm |
| Vehicle Width | 1810 mm | 1630 mm |
| Vehicle Height | 1420 mm | 1470 mm |
| Wheelbase Size | 2710 mm | 2380 mm |
