Comparison Audi TT Roadster (8S) 1.8 TFSI (180 Hp) S tronic & Audi A8 (D2,4D) 3.3 TDI V8 (224 Hp) Tiptronic & Infiniti Q45 I 4.5 (278 Hp)
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| Brand: | Audi | Audi | Infiniti |
| Model: | TT | A8 | Q45 |
| Generation: | TT Roadster (8S) | A8 (D2,4D) | Q45 I |
| Engine / modification: | 1.8 TFSI (180 Hp) S tronic | 3.3 TDI V8 (224 Hp) Tiptronic | 4.5 (278 Hp) |
| Production start: | 2015 year | 1999 year | 1989 year |
| Production end: | 2002 year | 1996 year | |
| Coupe type: | Roadster | Sedan | Sedan |
| Num. of Doors: | 2 | 4 | 4 |
| Num. of seats: | 2 | 5 | 5 |
| Fuel consumption / economy - urban: | 7.1 l/100 km | 13.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 5.0 l/100 km | 7.3 l/100 km | |
| Fuel consumption / economy - combined: | 5.8 l/100 km | 9.7 l/100 km | 12.4 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.29 | |
| Fuel tank volume: | 50 l | 90 l | 85 l |
| Emission standard: | EURO VI | Euro 3 | |
| CO2 emissions: | 132 g/km | 261 g/km | |
| Power: | 180 hp | 224 hp | 278 hp |
| Max power in: | 5100-6200 rpm. | 4000 rpm. | 6000 rpm. |
| Maximum speed: | 237 km/h | 242 km/h | 241 km/h |
| Acceleration from 0 to 100 km/h: | 7.3 sec | 8.2 sec | |
| Torque: | 250 Nm/1250-5000 rpm. | 480 Nm @ 1800-3000 rpm. | 396 Nm @ 4000 rpm. |
| Model Engine: | AKF | ||
| Engine position: | Front, transverse | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 1798 cm3 | 3328 cm3 | 4494 cm3 |
| Engine oil capacity: | 5.2 l | 5.3 l | |
| Coolant: | 9 l | 6.0 l | |
| Fuel System: | Direct injection | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbocharging | Turbo / Intercooler (Turbocharging / Intercooler) | |
| Position of cylinders: | Inline | V engine | V engine |
| Valvetrain: | DOHC | DOHC | DOHC |
| Number of cylinders: | 4 | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 9.6 | 18.5 | 10.2 |
| Piston Stroke: | 84.1 mm | 86.4 mm | 82.7 mm |
| Cylinder Bore: | 82.5 mm | 78.3 mm | 93 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7 S tronic | 5 Tiptronic | 4 |
| Length: | 4177 mm | 5034 mm | 5075 mm |
| Width: | 1832 mm | 1880 mm | 1825 mm |
| Width including mirrors: | 1966 mm | ||
| Height: | 1355 mm | 1440 mm | 1435 mm |
| Wheelbase: | 2505 mm | 2882 mm | 2880 mm |
| Front track: | 1572 mm | 1591 mm | 1570 mm |
| Rear (Back) track: | 1552 mm | 1580 mm | 1570 mm |
| Front overhang: | 884 mm | ||
| Rear overhang: | 788 mm | ||
| Minimum volume of Luggage (trunk): | 280 l | 525 l | 271 l |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Multi-link suspension | Coil spring |
| Rear suspension: | Independent, spring | Independent on trapezoidal lever | Helical spring |
| Max weight: | 1640 kg | 2460 kg | |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs | Disc |
| Kerb Weight: | 1320 kg | 1860 kg | 1833 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | |
| Max. roof load: | 100 kg | ||
| Permitted trailer load with brakes (8%): | 2300 kg | ||
| Minimum turning circle (turning diameter): | 10.96 m | 12.3 m | |
| Permitted trailer load with brakes (12%): | 2300 kg | ||
| Permitted trailer load without brakes: | 750 kg | ||
| Permitted towbar download: | 95 kg | ||
| Tire size: | 225/50 R17 | 225/60 R16 | 215/65 R16 V |
| Wheel rims size: | 8.0J x 17 | 7.5J x 16 |