Comparison Infiniti Q45 III 4.5 i V8 32V (340 Hp) & Audi S4 (8E,B6) 4.2i V8 (344 Hp) quattro
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| Brand: | Infiniti | Audi |
| Model: | Q45 | S4 |
| Generation: | Q45 III | S4 (8E,B6) |
| Engine / modification: | 4.5 i V8 32V (340 Hp) | 4.2i V8 (344 Hp) quattro |
| Production start: | 2001 year | 2003 year |
| Production end: | 2006 year | 2004 year |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.8 l/100 km | 19.5 l/100 km |
| Fuel consumption / economy - extra urban: | 9.4 l/100 km | 9.8 l/100 km |
| Fuel consumption / economy - combined: | 13.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.3 | |
| Fuel tank volume: | 85 l | 66 l |
| Emission standard: | Euro 4 | |
| CO2 emissions: | 321 g/km | |
| Power: | 340 hp | 344 hp |
| Max power in: | 6400 rpm. | 7000 rpm. |
| Maximum speed: | 230 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 5.9 sec | 5.6 sec |
| Torque: | 451 Nm @ 4000 rpm. | 410 Nm @ 3500 rpm. |
| Model Engine: | BBK | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4494 cm3 | 4163 cm3 |
| Engine oil capacity: | 9.0 l | |
| Coolant: | 12.2 l | |
| Fuel System: | Multi-point injection | Multi-point injection |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 5 |
| Compression ratio: | 10.5 | 11 |
| Piston Stroke: | 82.7 mm | 92.8 mm |
| Cylinder Bore: | 93 mm | 84.5 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 5 | 6 |
| Number of Gears (manual transmission): | 6 | |
| Length: | 5070 mm | 4575 mm |
| Width: | 1840 mm | 1781 mm |
| Height: | 1500 mm | 1415 mm |
| Wheelbase: | 2870 mm | 2651 mm |
| Front track: | 1580 mm | 1516 mm |
| Rear (Back) track: | 1560 mm | 1512 mm |
| Minimum volume of Luggage (trunk): | 355 l | 445 l |
| Maximum amount of Luggage (trunk): | 720 l | |
| Front suspension: | Coil spring | Independent multi-link |
| Rear suspension: | Helical spring | Independent on trapezoidal lever |
| Max weight: | 2210 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1820 kg | 1660 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 75 kg | |
| Minimum turning circle (turning diameter): | 11.5 m | |
| Tire size: | 225/55 R17 | 235/40 R18 |
| Wheel rims size: | 8J x 18 |