2003 Infiniti Q45 vs. 2011 Alpina B5
To start off, 2011 Alpina B5 is newer by 8 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, 2011 Alpina B5 (493 HP @ 5500 RPM) has 153 more horse power than 2003 Infiniti Q45. (340 HP @ 6400 RPM) In normal driving conditions, 2011 Alpina B5 should accelerate faster than 2003 Infiniti Q45. With that said, vehicle weight also plays an important factor in acceleration. 2011 Alpina B5 weights approximately 6 kg more than 2003 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, 2011 Alpina B5 (700 Nm @ 4250 RPM) has 249 more torque (in Nm) than 2003 Infiniti Q45. (451 Nm @ 4000 RPM). This means 2011 Alpina B5 will have an easier job in driving up hills or pulling heavy equipment than 2003 Infiniti Q45.
Compare all specifications:
| 2003 Infiniti Q45 | 2011 Alpina B5 | |
| Make | Infiniti | Alpina |
| Model | Q45 | B5 |
| Year Released | 2003 | 2011 |
| Body Type | Sedan | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 4494 cc | 4397 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 340 HP | 493 HP |
| Engine RPM | 6400 RPM | 5500 RPM |
| Torque | 451 Nm | 700 Nm |
| Torque RPM | 4000 RPM | 4250 RPM |
| Engine Compression Ratio | 10.5:1 | 9.0:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1804 kg | 1810 kg |
| Vehicle Length | 5080 mm | 4850 mm |
| Vehicle Width | 1850 mm | 1850 mm |
| Vehicle Height | 1500 mm | 1500 mm |
| Wheelbase Size | 2880 mm | 2890 mm |
| Fuel Tank Capacity | 81 L | 70 L |
