Comparison Audi A8 Long (D3, 4E, facelift 2007) 4.2 BiTDI V8 (326 Hp) quattro DPF Tiptronic & Audi TT Roadster (8J, facelift 2010) 2.0 TFSI (211 Hp)
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| Brand: | Audi | Audi |
| Model: | A8 | TT |
| Generation: | A8 Long (D3, 4E, facelift 2007) | TT Roadster (8J, facelift 2010) |
| Engine / modification: | 4.2 BiTDI V8 (326 Hp) quattro DPF Tiptronic | 2.0 TFSI (211 Hp) |
| Production start: | 2007 year | 2010 year |
| Production end: | 2010 year | 2014 year |
| Coupe type: | Sedan | Roadster |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 13.3 l/100 km | 9.0 l/100 km |
| Fuel consumption / economy - extra urban: | 7.2 l/100 km | 5.4 l/100 km |
| Fuel consumption / economy - combined: | 9.4 l/100 km | 6.7 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.27 | 0.32 |
| Fuel tank volume: | 90 l | 55 l |
| Emission standard: | Euro 4 | Euro 5 |
| CO2 emissions: | 156 g/km | |
| Power: | 326 hp | 211 hp |
| Max power in: | 3750 rpm. | 4500-6200 rpm. |
| Maximum speed: | 250 km/h | 242 km/h |
| Acceleration from 0 to 100 km/h: | 6.1 sec | 6.3 sec |
| Torque: | 650 Nm @ 1600-3500 rpm. | 350 Nm @ 1600-4200 rpm. |
| Model Engine: | BVN | CESA, CETA |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 4134 cm3 | 1984 cm3 |
| Engine oil capacity: | 10.0 l | 4.6 l |
| Coolant: | 8.6 l | |
| Fuel System: | Diesel Commonrail | Direct injection |
| Aspiration / Turbine: | BiTurbo | Turbo / Intercooler (Turbocharging / Intercooler) |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.5 | 9.6 |
| Piston Stroke: | 95.5 mm | 92.8 mm |
| Cylinder Bore: | 83 mm | 82.5 mm |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | 6 Tiptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 5192 mm | 4198 mm |
| Width: | 1894 mm | 1842 mm |
| Width including mirrors: | 1952 mm | |
| Height: | 1455 mm | 1358 mm |
| Wheelbase: | 3074 mm | 2468 mm |
| Front track: | 1629 mm | 1572 mm |
| Rear (Back) track: | 1615 mm | 1558 mm |
| Front overhang: | 911 mm | |
| Rear overhang: | 819 mm | |
| Minimum volume of Luggage (trunk): | 500 l | 250 l |
| Maximum amount of Luggage (trunk): | 700 l | |
| Front suspension: | Multi-link suspension | Independent, Spring McPherson, with stabilizer |
| Rear suspension: | Independent on trapezoidal lever | Independent, spring multi-link with stabilizer |
| Max weight: | 2595 kg | 1635 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1995 kg | 1315 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 12.5 m | 10.96 m |
| Tire size: | 235/55 R17 | 225/55 R16 |
| Wheel rims size: | 8J x 17 | 7.5J x 16 |