1991 Infiniti Q45 vs. 2005 Infiniti QX56
To start off, 2005 Infiniti QX56 is newer by 14 year(s). Which means there will be less support and parts availability for 1991 Infiniti Q45. In addition, the cost of maintenance, including insurance, on 1991 Infiniti Q45 would be higher. At 5,555 cc (8 cylinders), 2005 Infiniti QX56 is equipped with a bigger engine. In terms of performance, 2005 Infiniti QX56 (315 HP @ 6400 RPM) has 38 more horse power than 1991 Infiniti Q45. (277 HP @ 6000 RPM) In normal driving conditions, 2005 Infiniti QX56 should accelerate faster than 1991 Infiniti Q45. With that said, vehicle weight also plays an important factor in acceleration. 2005 Infiniti QX56 weights approximately 681 kg more than 1991 Infiniti Q45. 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, 2005 Infiniti QX56 (529 Nm) has 132 more torque (in Nm) than 1991 Infiniti Q45. (397 Nm). This means 2005 Infiniti QX56 will have an easier job in driving up hills or pulling heavy equipment than 1991 Infiniti Q45.
Compare all specifications:
| 1991 Infiniti Q45 | 2005 Infiniti QX56 | |
| Make | Infiniti | Infiniti |
| Model | Q45 | QX56 |
| Year Released | 1991 | 2005 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 4494 cc | 5555 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 277 HP | 315 HP |
| Engine RPM | 6000 RPM | 6400 RPM |
| Torque | 397 Nm | 529 Nm |
| Engine Bore Size | 93 mm | 98 mm |
| Engine Stroke Size | 82.7 mm | 92 mm |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 7 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1750 kg | 2431 kg |
| Vehicle Length | 5080 mm | 5260 mm |
| Vehicle Width | 1830 mm | 2010 mm |
| Vehicle Height | 1440 mm | 1960 mm |
| Wheelbase Size | 2890 mm | 3140 mm |
| Fuel Tank Capacity | 72 L | 106 L |
