2004 BMW 645 vs. 2012 BMW Z4
To start off, 2012 BMW Z4 is newer by 8 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 140 more horse power than 2012 BMW Z4. (182 HP @ 5000 RPM). In normal driving conditions, 2004 BMW 645 should accelerate faster than 2012 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 235 kg more than 2012 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, 2004 BMW 645 (447 Nm) has 177 more torque (in Nm) than 2012 BMW Z4. (270 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2012 BMW Z4.
Compare all specifications:
| 2004 BMW 645 | 2012 BMW Z4 | |
| Make | BMW | BMW |
| Model | 645 | Z4 |
| Year Released | 2004 | 2012 |
| Body Type | Coupe | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 1997 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 322 HP | 182 HP |
| Engine RPM | 7400 RPM | 5000 RPM |
| Torque | 447 Nm | 270 Nm |
| Engine Bore Size | 92 mm | 90.1 mm |
| Engine Stroke Size | 83 mm | 84 mm |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1715 kg | 1480 kg |
| Vehicle Length | 4840 mm | 4239 mm |
| Vehicle Width | 1860 mm | 1791 mm |
| Vehicle Height | 1380 mm | 1290 mm |
| Wheelbase Size | 2790 mm | 2497 mm |
| Fuel Consumption Highway | 9.4 L/100km | 5.5 L/100km |
| Fuel Consumption City | 13.8 L/100km | 9.1 L/100km |
| Fuel Consumption Overall | 11.8 L/100km | 6.8 L/100km |
| Fuel Tank Capacity | 70 L | 55 L |
