2006 BMW Z4 vs. 2004 BMW 325
To start off, 2006 BMW Z4 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 BMW 325. In addition, the cost of maintenance, including insurance, on 2004 BMW 325 would be higher. At 2,979 cc (6 cylinders), 2006 BMW Z4 is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (229 HP @ 5900 RPM) has 45 more horse power than 2004 BMW 325. (184 HP @ 7250 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 2004 BMW 325. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW Z4 weights approximately 35 kg more than 2004 BMW 325. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2006 BMW Z4 (300 Nm) has 63 more torque (in Nm) than 2004 BMW 325. (237 Nm). This means 2006 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW 325.
Compare all specifications:
| 2006 BMW Z4 | 2004 BMW 325 | |
| Make | BMW | BMW |
| Model | Z4 | 325 |
| Year Released | 2006 | 2004 |
| Body Type | Convertible | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 2979 cc | 2490 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 229 HP | 184 HP |
| Engine RPM | 5900 RPM | 7250 RPM |
| Torque | 300 Nm | 237 Nm |
| Engine Bore Size | 84 mm | 84 mm |
| Engine Stroke Size | 90 mm | 75 mm |
| Engine Compression Ratio | 10.2:1 | 10.5:1 |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1630 kg | 1595 kg |
| Vehicle Length | 4570 mm | 4480 mm |
| Vehicle Width | 1790 mm | 1750 mm |
| Vehicle Height | 1680 mm | 1420 mm |
| Wheelbase Size | 2500 mm | 2730 mm |
| Fuel Consumption Overall | 9.1 L/100km | 9.8 L/100km |
| Fuel Tank Capacity | 55 L | 63 L |
