2006 BMW Z4 vs. 2005 BMW 525
To start off, 2006 BMW Z4 is newer by 1 year(s). Which means there will be less support and parts availability for 2005 BMW 525. In addition, the cost of maintenance, including insurance, on 2005 BMW 525 would be higher. At 2,496 cc (6 cylinders), 2005 BMW 525 is equipped with a bigger engine. In terms of performance, 2005 BMW 525 (225 HP @ 6500 RPM) has 36 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM) In normal driving conditions, 2005 BMW 525 should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 525 weights approximately 425 kg more than 2006 BMW Z4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 BMW 525 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, 2005 BMW 525 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, 2005 BMW 525 (250 Nm @ 2750 RPM) has 5 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2005 BMW 525 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4.
Compare all specifications:
| 2006 BMW Z4 | 2005 BMW 525 | |
| Make | BMW | BMW |
| Model | Z4 | 525 |
| Year Released | 2006 | 2005 |
| Body Type | Convertible | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 2496 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 225 HP |
| Engine RPM | 6000 RPM | 6500 RPM |
| Torque | 245 Nm | 250 Nm |
| Torque RPM | 3500 RPM | 2750 RPM |
| Engine Bore Size | 84 mm | 82 mm |
| Engine Stroke Size | 75 mm | 78.8 mm |
| Engine Compression Ratio | 11.0:1 | 11.0:1 |
| Top Speed | 235 km/hour | 232 km/hour |
| Acceleration 0-100mph | 7 seconds | 8.5 seconds |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1335 kg | 1760 kg |
| Vehicle Length | 4100 mm | 4850 mm |
| Vehicle Width | 1790 mm | 1850 mm |
| Vehicle Height | 1310 mm | 1500 mm |
| Wheelbase Size | 2500 mm | 2890 mm |
| Fuel Consumption Overall | 9 L/100km | 9.6 L/100km |
| Fuel Tank Capacity | 55 L | 70 L |
