2004 BMW Z4 vs. 2007 BMW 523
To start off, 2007 BMW 523 is newer by 3 year(s). Which means there will be less support and parts availability for 2004 BMW Z4. In addition, the cost of maintenance, including insurance, on 2004 BMW Z4 would be higher. At 2,497 cc (6 cylinders), 2007 BMW 523 is equipped with a bigger engine. In terms of performance, 2007 BMW 523 (175 HP @ 5800 RPM) has 7 more horse power than 2004 BMW Z4. (168 HP @ 6250 RPM) In normal driving conditions, 2007 BMW 523 should accelerate faster than 2004 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW 523 weights approximately 165 kg more than 2004 BMW Z4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front 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 BMW 523 (230 Nm @ 3500 RPM) has 20 more torque (in Nm) than 2004 BMW Z4. (210 Nm @ 3500 RPM). This means 2007 BMW 523 will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW Z4.
Compare all specifications:
| 2004 BMW Z4 | 2007 BMW 523 | |
| Make | BMW | BMW |
| Model | Z4 | 523 |
| Year Released | 2004 | 2007 |
| Engine Position | Front | Front |
| Engine Size | 2171 cc | 2497 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 168 HP | 175 HP |
| Engine RPM | 6250 RPM | 5800 RPM |
| Torque | 210 Nm | 230 Nm |
| Torque RPM | 3500 RPM | 3500 RPM |
| Engine Compression Ratio | 10.8:1 | 11.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Acceleration 0-100mph | 7.7 seconds | 8.5 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1325 kg | 1490 kg |
| Vehicle Width | 1790 mm | 1470 mm |
| Vehicle Height | 1310 mm | 1850 mm |
| Wheelbase Size | 2500 mm | 2890 mm |
| Fuel Consumption Overall | 8.9 L/100km | 8.5 L/100km |
| Fuel Tank Capacity | 55 L | 70 L |
