2003 Infiniti Q45 vs. 2007 Lexus RX
To start off, 2007 Lexus RX is newer by 4 year(s). Which means there will be less support and parts availability for 2003 Infiniti Q45. In addition, the cost of maintenance, including insurance, on 2003 Infiniti Q45 would be higher. At 4,494 cc (8 cylinders), 2003 Infiniti Q45 is equipped with a bigger engine. In terms of performance, 2003 Infiniti Q45 (340 HP @ 6400 RPM) has 68 more horse power than 2007 Lexus RX. (272 HP @ 6200 RPM). In normal driving conditions, 2003 Infiniti Q45 should accelerate faster than 2007 Lexus RX. With that said, vehicle weight also plays an important factor in acceleration. 2007 Lexus RX weights approximately 106 kg more than 2003 Infiniti Q45.
Because 2007 Lexus RX is four wheel drive (4WD), it will have significant more traction and grip than 2003 Infiniti Q45. In wet, icy, snow, or gravel driving conditions, 2007 Lexus RX will offer significantly more control. 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, 2003 Infiniti Q45 (451 Nm @ 4000 RPM) has 109 more torque (in Nm) than 2007 Lexus RX. (342 Nm @ 4700 RPM). This means 2003 Infiniti Q45 will have an easier job in driving up hills or pulling heavy equipment than 2007 Lexus RX.
Compare all specifications:
| 2003 Infiniti Q45 | 2007 Lexus RX | |
| Make | Infiniti | Lexus |
| Model | Q45 | RX |
| Year Released | 2003 | 2007 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 4494 cc | 3456 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 340 HP | 272 HP |
| Engine RPM | 6400 RPM | 6200 RPM |
| Torque | 451 Nm | 342 Nm |
| Torque RPM | 4000 RPM | 4700 RPM |
| Engine Compression Ratio | 10.5:1 | 10.8:1 |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1804 kg | 1910 kg |
| Vehicle Length | 5080 mm | 4580 mm |
| Vehicle Width | 1850 mm | 1850 mm |
| Vehicle Height | 1500 mm | 1680 mm |
| Wheelbase Size | 2880 mm | 2730 mm |
| Fuel Tank Capacity | 81 L | 75 L |
