Comparison Renault 21 (B48) 2.1 D (74 Hp) & Citroen C4 I Grand Picasso (Phase I, 2006) 2.0i 16V (140 Hp) Automatic & Renault Megane I Cabriolet (Phase II, 1999) 1.6i 16V (107 Hp)
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| Brand: | Renault | Citroen | Renault |
| Model: | 21 | C4 | Megane |
| Generation: | 21 (B48) | C4 I Grand Picasso (Phase I, 2006) | Megane I Cabriolet (Phase II, 1999) |
| Engine / modification: | 2.1 D (74 Hp) | 2.0i 16V (140 Hp) Automatic | 1.6i 16V (107 Hp) |
| Production start: | 1989 year | 2006 year | 1999 year |
| Production end: | 1993 year | 2008 year | 2003 year |
| Coupe type: | Sedan | Cabriolet | |
| Num. of Doors: | 4 | 5 | 2 |
| Num. of seats: | 5 | 7 | 4 |
| Fuel consumption / economy - urban: | 7.4 l/100 km | 12.9 l/100 km | 9.4 l/100 km |
| Fuel consumption / economy - extra urban: | 4.5 l/100 km | 6.6 l/100 km | 5.7 l/100 km |
| Fuel consumption / economy - combined: | 5.9 l/100 km | 8.9 l/100 km | 7.0 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | ||
| Fuel tank volume: | 66 l | 60 l | 60 l |
| Emission standard: | Euro 4 | Euro 3 | |
| CO2 emissions: | 190 g/km | 165 g/km | |
| Power: | 74 hp | 140 hp | 107 hp |
| Max power in: | 4500 rpm. | 6000 rpm. | 5750 rpm. |
| Maximum speed: | 170 km/h | 190 km/h | 200 km/h |
| Acceleration from 0 to 100 km/h: | 15.1 sec | 13.7 sec | 10.1 sec |
| Torque: | 139 Nm @ 2250 rpm. | 200 Nm @ 4000 rpm. | 148 Nm @ 3750 rpm. |
| Model Engine: | J8S | K4M | |
| Engine position: | Front, transverse | Front, transverse | Front, transverse |
| Engine displacement: | 2068 cm3 | 1997 cm3 | 1598 cm3 |
| Engine oil capacity: | 6.1 l | 5 l | 4.4 l |
| Coolant: | 7.1 l | 6.5-6.7 l | 7.9 l |
| Fuel System: | Diesel - Standard diesel injection (SDI) | Multi-point injection | Multi-point injection |
| Position of cylinders: | Inline | Inline | Inline |
| Valvetrain: | OHC | DOHC | |
| Number of cylinders: | 4 | 4 | 4 |
| Number of valves per cylinder: | 2 | 4 | 4 |
| Compression ratio: | 21.5 | 10.8 | 10 |
| Piston Stroke: | 89 mm | 88 mm | 80.5 mm |
| Cylinder Bore: | 86 mm | 85 mm | 79.5 mm |
| Wheel Drive: | Front wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | - | 4 | |
| Number of Gears (manual transmission): | 5 | 5 | |
| Length: | 4530 mm | 4590 mm | 4082 mm |
| Width: | 1730 mm | 1830 mm | 1698 mm |
| Width including mirrors: | 2100 mm | ||
| Height: | 1415 mm | 1660-1710 mm | 1368 mm |
| Wheelbase: | 2660 mm | 2728 mm | 2468 mm |
| Front track: | 1430 mm | 1505 mm | 1450 mm |
| Rear (Back) track: | 1400 mm | 1539 mm | 1432 mm |
| Front overhang: | 995 mm | ||
| Rear overhang: | 867 mm | ||
| Minimum volume of Luggage (trunk): | 490 l | 208 l | 281 l |
| Maximum amount of Luggage (trunk): | 1951 l | ||
| Front suspension: | The depreciated rack | Independent, Spring McPherson, with stabilizer | Independent, spring |
| Rear suspension: | Torsion | Semi-independent, spring | Torsion |
| Max weight: | 1570 kg | 2260 kg | 1560 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Drum | Disc | Drum |
| Kerb Weight: | 1100 kg | 1600 kg | 1125 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: | 80 kg | ||
| Permitted trailer load with brakes (8%): | 1700 kg | ||
| Minimum turning circle (turning diameter): | 11.85 m | 11.30 m | |
| Permitted trailer load with brakes (12%): | 1200 kg | 1250 kg | |
| Permitted trailer load without brakes: | 750 kg | 600 kg | |
| Permitted towbar download: | 60 kg | 75 kg | |
| Tire size: | 175/70 R13 | 215/50 R17 | 185/55 R15 |
| Wheel rims size: | R13 | R17 | 6.0J x 15 |