2005 Infiniti FX vs. 2006 Kia Optima
To start off, 2006 Kia Optima is newer by 1 year(s). Which means there will be less support and parts availability for 2005 Infiniti FX. In addition, the cost of maintenance, including insurance, on 2005 Infiniti FX would be higher. At 3,498 cc (6 cylinders), 2005 Infiniti FX is equipped with a bigger engine. In terms of performance, 2005 Infiniti FX (276 HP @ 6200 RPM) has 138 more horse power than 2006 Kia Optima. (138 HP @ 5500 RPM). In normal driving conditions, 2005 Infiniti FX should accelerate faster than 2006 Kia Optima. With that said, vehicle weight also plays an important factor in acceleration. 2006 Kia Optima weights approximately 160 kg more than 2005 Infiniti FX.
Because 2005 Infiniti FX 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 2005 Infiniti FX. However, in wet, icy, snow, or gravel driving conditions, 2006 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, 2005 Infiniti FX (366 Nm @ 4800 RPM) has 167 more torque (in Nm) than 2006 Kia Optima. (199 Nm @ 3000 RPM). This means 2005 Infiniti FX will have an easier job in driving up hills or pulling heavy equipment than 2006 Kia Optima. 2005 Infiniti FX has automatic transmission and 2006 Kia Optima has manual transmission. 2006 Kia Optima will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2005 Infiniti FX will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Infiniti FX | 2006 Kia Optima | |
| Make | Infiniti | Kia |
| Model | FX | Optima |
| Year Released | 2005 | 2006 |
| Body Type | Crossover | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3498 cc | 2351 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 276 HP | 138 HP |
| Engine RPM | 6200 RPM | 5500 RPM |
| Torque | 366 Nm | 199 Nm |
| Torque RPM | 4800 RPM | 3000 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Front |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1840 kg | 2000 kg |
| Vehicle Length | 4810 mm | 4730 mm |
| Vehicle Width | 1930 mm | 1820 mm |
| Vehicle Height | 1660 mm | 1420 mm |
| Wheelbase Size | 2860 mm | 2710 mm |
| Fuel Tank Capacity | 90 L | 65 L |
