2006 BMW 645 vs. 2005 Kia Optima
To start off, 2006 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2005 Kia Optima. In addition, the cost of maintenance, including insurance, on 2005 Kia Optima would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 158 more horse power than 2005 Kia Optima. (170 HP @ 4000 RPM). In normal driving conditions, 2006 BMW 645 should accelerate faster than 2005 Kia Optima. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 323 kg more than 2005 Kia Optima. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2006 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2005 Kia Optima, being front wheel drive (FWD), will offer much better control with better grip. 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, 2006 BMW 645 (450 Nm) has 209 more torque (in Nm) than 2005 Kia Optima. (241 Nm). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2005 Kia Optima.
Compare all specifications:
| 2006 BMW 645 | 2005 Kia Optima | |
| Make | BMW | Kia |
| Model | 645 | Optima |
| Year Released | 2006 | 2005 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 2671 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 328 HP | 170 HP |
| Engine RPM | 6100 RPM | 4000 RPM |
| Torque | 450 Nm | 241 Nm |
| Engine Compression Ratio | 10.0:1 | 10.0:1 |
| Drive Type | Rear | Front |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1810 kg | 1487 kg |
| Vehicle Length | 4830 mm | 4730 mm |
| Vehicle Width | 1860 mm | 1820 mm |
| Vehicle Height | 1380 mm | 1420 mm |
| Wheelbase Size | 2790 mm | 2710 mm |
| Fuel Consumption Overall | 13.3 L/100km | 10.4 L/100km |
| Fuel Tank Capacity | 70 L | 65 L |
