2008 Audi A4 vs. 2003 Infiniti Q45
To start off, 2008 Audi A4 is newer by 5 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 153 more horse power than 2008 Audi A4. (187 HP @ 5700 RPM) In normal driving conditions, 2003 Infiniti Q45 should accelerate faster than 2008 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2003 Infiniti Q45 weights approximately 274 kg more than 2008 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2008 Audi A4 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, 2008 Audi A4 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 211 more torque (in Nm) than 2008 Audi A4. (240 Nm @ 1950 RPM). This means 2003 Infiniti Q45 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi A4. 2003 Infiniti Q45 has automatic transmission and 2008 Audi A4 has manual transmission. 2008 Audi A4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2003 Infiniti Q45 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 Audi A4 | 2003 Infiniti Q45 | |
| Make | Audi | Infiniti |
| Model | A4 | Q45 |
| Year Released | 2008 | 2003 |
| Body Type | Station Wagon | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1779 cc | 4494 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 187 HP | 340 HP |
| Engine RPM | 5700 RPM | 6400 RPM |
| Torque | 240 Nm | 451 Nm |
| Torque RPM | 1950 RPM | 4000 RPM |
| Engine Compression Ratio | 9.0:1 | 10.5:1 |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1530 kg | 1804 kg |
| Vehicle Length | 4550 mm | 5080 mm |
| Vehicle Width | 1780 mm | 1850 mm |
| Vehicle Height | 1430 mm | 1500 mm |
| Wheelbase Size | 2660 mm | 2880 mm |
| Fuel Tank Capacity | 66 L | 81 L |
