Comparison Citroen C8 (Phase I) 2.2 HDi Biturbo (170 Hp) FAP Automatic & Audi S8 (D5, facelift 2021) 4.0 TFSI V8 (571 Hp) MHEV quattro tiptronic
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| Brand: | Citroen | Audi |
| Model: | C8 | S8 |
| Generation: | C8 (Phase I) | S8 (D5, facelift 2021) |
| Engine / modification: | 2.2 HDi Biturbo (170 Hp) FAP Automatic | 4.0 TFSI V8 (571 Hp) MHEV quattro tiptronic |
| Production start: | 2007 year | 2021 year |
| Production end: | 2008 year | |
| Coupe type: | Sedan | |
| Num. of Doors: | 5 | 4 |
| Num. of seats: | 7 | 5 |
| Fuel consumption / economy - urban: | 11.0 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.6 l/100 km | |
| Fuel consumption / economy - combined: | 8.2 l/100 km | |
| Fuel consumption at Low speed (WLTP): | 20.5 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel consumption at Medium speed (WLTP): | 12 l/100 km | |
| Fuel consumption at high speed (WLTP): | 9.5 l/100 km | |
| Drag coefficient: | 0.28 | |
| Fuel tank volume: | 80 l | 82 l |
| Fuel consumption at very high speed (WLTP): | 9.5 l/100 km | |
| Combined fuel consumption (WLTP): | 11.5 l/100 km | |
| Emission standard: | Euro 4 | Euro 6d-ISC-FCM |
| CO2 emissions: | 218 g/km | |
| Power: | 170 hp | 571 hp |
| Max power in: | 4000 rpm. | 6000 rpm. |
| Maximum speed: | 197 km/h | 250 , Electronically limited km/h |
| Acceleration from 0 to 100 km/h: | 10.8 sec | 3.8 sec |
| CO2 emissions (WLTP): | 261 g/km | |
| Torque: | 400 Nm @ 1750 rpm. | 800 Nm @ 2050-4500 rpm. |
| Model Engine: | CWWB | |
| Engine position: | Front, transverse | Front, longitudinal |
| Engine displacement: | 2179 cm3 | 3996 cm3 |
| Engine oil capacity: | 9.5 l | |
| Coolant: | 16.3 l | |
| Fuel System: | Diesel Commonrail | Direct injection |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | DOHC | DOHC |
| Number of cylinders: | 4 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.6 | 10.1 |
| Piston Stroke: | 96 mm | 86 mm |
| Cylinder Bore: | 85 mm | 86 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | 8 tiptronic |
| Length: | 4727 mm | 5190 mm |
| Width: | 1854 mm | 1945 mm |
| Width with mirrors folded: | 1952 mm | |
| Width including mirrors: | 2205 mm | 2130 mm |
| Height: | 1766-1856 mm | 1475 mm |
| Wheelbase: | 2823 mm | 2998 mm |
| Front track: | 1570 mm | 1629 mm |
| Rear (Back) track: | 1548 mm | 1614 mm |
| Approach angle: | 11 ° | |
| Departure angle: | 14 ° | |
| Front overhang: | 1013 mm | 1007 mm |
| Rear overhang: | 891 mm | 1185 mm |
| Minimum volume of Luggage (trunk): | 225 l | 505 l |
| Maximum amount of Luggage (trunk): | 2948 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | |
| Rear suspension: | Semi-independent, spring | |
| Max weight: | 2610 kg | 2835 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1818 kg | 2220 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 100 kg | 90 kg |
| Permitted trailer load with brakes (8%): | 2300 kg | |
| Minimum turning circle (turning diameter): | 11.62 m | 11.4 m |
| Permitted trailer load with brakes (12%): | 1870 kg | 2300 kg |
| Permitted trailer load without brakes: | 750 kg | 750 kg |
| Permitted towbar download: | 75 kg | 95 kg |
| Tire size: | 215/60 R16 | 265/40 R20 |
| Wheel rims size: | 6.5J x 15 | 9J x 20 |