Comparison Mercedes-Benz R-class (W251) R 500 V8 (306 Hp) 4MATIC 7G-TRONIC & Mercedes-Benz SLK (R170, facelift 2000) SLK 230 Kompressor (197 Hp) Automatic
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | R-class | SLK |
| Generation: | R-class (W251) | SLK (R170, facelift 2000) |
| Engine / modification: | R 500 V8 (306 Hp) 4MATIC 7G-TRONIC | SLK 230 Kompressor (197 Hp) Automatic |
| Production start: | 2005 year | 2000 year |
| Production end: | 2007 year | 2004 year |
| Coupe type: | Combi | Roadster |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 6 | 2 |
| Fuel consumption / economy - combined: | 13.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.33 | |
| Fuel tank volume: | 80 l | 60 l |
| Emission standard: | Euro 4 | Euro 4 |
| CO2 emissions: | 317 g/km | |
| Power: | 306 hp | 197 hp |
| Max power in: | 5600 rpm. | 5300 rpm. |
| Maximum speed: | 245 km/h | 237 km/h |
| Acceleration from 0 to 100 km/h: | 6.9 sec | 7.2 sec |
| Torque: | 460 Nm @ 2700-4750 rpm. | 280 Nm @ 2500-5000 rpm. |
| Model Engine: | M 113.971 | M 111.983 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4966 cm3 | 2295 cm3 |
| Engine oil capacity: | 8.5 l | 5.5 l |
| Coolant: | 10.1-13 l | 8 l |
| Fuel System: | Multi-point injection | |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | SOHC | DOHC |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 3 | 4 |
| Compression ratio: | 10 | 9 |
| Piston Stroke: | 84 mm | 88.4 mm |
| Cylinder Bore: | 97 mm | 90.9 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 5 |
| Length: | 4922 mm | 4010 mm |
| Width: | 1922 mm | 1715 mm |
| Width including mirrors: | 2168 mm | |
| Height: | 1661 mm | 1279 mm |
| Wheelbase: | 2980 mm | 2400 mm |
| Front track: | 1665 mm | 1488 mm |
| Rear (Back) track: | 1658 mm | 1485 mm |
| Front overhang: | 922 mm | |
| Rear overhang: | 1020 mm | |
| Minimum volume of Luggage (trunk): | 550 l | 145 l |
| Maximum amount of Luggage (trunk): | 1950 l | 348 l |
| Front suspension: | Double wishbone | |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 2865 kg | 1645 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 2115 kg | 1310 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 100 kg | 30 kg |
| Minimum turning circle (turning diameter): | 11.7 m | 10.6 m |
| Permitted trailer load with brakes (12%): | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 255/55 R18; 255/50 R19 | Front wheel tires: 205/55 R 16 91 V |
| Wheel rims size: | 8J x 18; 8J x 19 | Front wheel rims: 7 J x 16 H 2 |