2004 Alfa Romeo 156 vs. 2006 BMW Z4
To start off, 2006 BMW Z4 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 Alfa Romeo 156. In addition, the cost of maintenance, including insurance, on 2004 Alfa Romeo 156 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 41 more horse power than 2004 Alfa Romeo 156. (148 HP @ 4000 RPM) In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2004 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2004 Alfa Romeo 156 weights approximately 190 kg more than 2006 BMW Z4.
Because 2004 Alfa Romeo 156 is four wheel drive (4WD), it will have significant more traction and grip than 2006 BMW Z4. In wet, icy, snow, or gravel driving conditions, 2004 Alfa Romeo 156 will offer significantly more control. 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, 2004 Alfa Romeo 156 (300 Nm @ 2000 RPM) has 55 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2004 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4. 2006 BMW Z4 has automatic transmission and 2004 Alfa Romeo 156 has manual transmission. 2004 Alfa Romeo 156 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2006 BMW Z4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2004 Alfa Romeo 156 | 2006 BMW Z4 | |
| Make | Alfa Romeo | BMW |
| Model | 156 | Z4 |
| Year Released | 2004 | 2006 |
| Body Type | Station Wagon | Convertible |
| Engine Position | Front | Front |
| Engine Size | 1910 cc | 2492 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 148 HP | 189 HP |
| Engine RPM | 4000 RPM | 6000 RPM |
| Torque | 300 Nm | 245 Nm |
| Torque RPM | 2000 RPM | 3500 RPM |
| Engine Bore Size | 82 mm | 84 mm |
| Engine Stroke Size | 90.4 mm | 75 mm |
| Engine Compression Ratio | 18.5:1 | 11.0:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 200 km/hour | 235 km/hour |
| Acceleration 0-100mph | 10.5 seconds | 7 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1525 kg | 1335 kg |
| Vehicle Width | 1750 mm | 1790 mm |
| Vehicle Height | 1460 mm | 1310 mm |
| Wheelbase Size | 2600 mm | 2500 mm |
| Fuel Consumption Overall | 6.8 L/100km | 9 L/100km |
| Fuel Tank Capacity | 63 L | 55 L |
