2006 Infiniti QX56 vs. 2003 Infiniti FX
To start off, 2006 Infiniti QX56 is newer by 3 year(s). Which means there will be less support and parts availability for 2003 Infiniti FX. In addition, the cost of maintenance, including insurance, on 2003 Infiniti FX would be higher. At 5,555 cc (8 cylinders), 2006 Infiniti QX56 is equipped with a bigger engine. In terms of performance, 2006 Infiniti QX56 (315 HP @ 4900 RPM) has 4 more horse power than 2003 Infiniti FX. (311 HP @ 6400 RPM). In normal driving conditions, 2006 Infiniti QX56 should accelerate faster than 2003 Infiniti FX. With that said, vehicle weight also plays an important factor in acceleration. 2003 Infiniti FX weights approximately 630 kg more than 2006 Infiniti QX56.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear 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, 2006 Infiniti QX56 (529 Nm @ 3600 RPM) has 83 more torque (in Nm) than 2003 Infiniti FX. (446 Nm @ 4000 RPM). This means 2006 Infiniti QX56 will have an easier job in driving up hills or pulling heavy equipment than 2003 Infiniti FX.
Compare all specifications:
| 2006 Infiniti QX56 | 2003 Infiniti FX | |
| Make | Infiniti | Infiniti |
| Model | QX56 | FX |
| Year Released | 2006 | 2003 |
| Body Type | SUV | Crossover |
| Engine Position | Front | Front |
| Engine Size | 5555 cc | 4494 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 315 HP | 311 HP |
| Engine RPM | 4900 RPM | 6400 RPM |
| Torque | 529 Nm | 446 Nm |
| Torque RPM | 3600 RPM | 4000 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 7 seats | 5 seats |
| Number of Doors | 5 doors | 5 doors |
| Vehicle Weight | 1320 kg | 1950 kg |
| Vehicle Length | 5260 mm | 4810 mm |
| Vehicle Width | 2010 mm | 1930 mm |
| Vehicle Height | 1980 mm | 1660 mm |
| Wheelbase Size | 3140 mm | 2860 mm |
