Comparison Renault 21 (B48) 2.1 D (74 Hp) & Citroen C4 I Grand Picasso (Phase I, 2006) 2.0i 16V (140 Hp) Automatic & Citroen C4 I Picasso (Phase I, 2007) 2.0 HDi (136 Hp) FAP Automatic
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| Brand: | Renault | Citroen | Citroen |
| Model: | 21 | C4 | C4 |
| Generation: | 21 (B48) | C4 I Grand Picasso (Phase I, 2006) | C4 I Picasso (Phase I, 2007) |
| Engine / modification: | 2.1 D (74 Hp) | 2.0i 16V (140 Hp) Automatic | 2.0 HDi (136 Hp) FAP Automatic |
| Production start: | 1989 year | 2006 year | 2007 year |
| Production end: | 1993 year | 2008 year | 2010 year |
| Coupe type: | Sedan | ||
| Num. of Doors: | 4 | 5 | 5 |
| Num. of seats: | 5 | 7 | 5 |
| Fuel consumption / economy - urban: | 7.4 l/100 km | 12.9 l/100 km | 9.9 l/100 km |
| Fuel consumption / economy - extra urban: | 4.5 l/100 km | 6.6 l/100 km | 5.9 l/100 km |
| Fuel consumption / economy - combined: | 5.9 l/100 km | 8.9 l/100 km | 7.4 l/100 km |
| Fuel Type: | Diesel | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.31 | 0.31 | |
| Fuel tank volume: | 66 l | 60 l | 60 l |
| Emission standard: | Euro 4 | Euro 4 | |
| CO2 emissions: | 190 g/km | 195 g/km | |
| Power: | 74 hp | 140 hp | 136 hp |
| Max power in: | 4500 rpm. | 6000 rpm. | 4000 rpm. |
| Maximum speed: | 170 km/h | 190 km/h | 190 km/h |
| Acceleration from 0 to 100 km/h: | 15.1 sec | 13.7 sec | 12.1 sec |
| Torque: | 139 Nm @ 2250 rpm. | 200 Nm @ 4000 rpm. | 270 Nm @ 2000 rpm. |
| Model Engine: | J8S | ||
| Engine position: | Front, transverse | Front, transverse | Front, transverse |
| Engine displacement: | 2068 cm3 | 1997 cm3 | 1997 cm3 |
| Engine oil capacity: | 6.1 l | 5 l | 5.25 l |
| Coolant: | 7.1 l | 6.5-6.7 l | 8-9 l |
| Fuel System: | Diesel - Standard diesel injection (SDI) | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | Turbo / Intercooler (Turbocharging / Intercooler) | ||
| 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 | 17.6 |
| Piston Stroke: | 89 mm | 88 mm | 88 mm |
| Cylinder Bore: | 86 mm | 85 mm | 85 mm |
| Wheel Drive: | Front wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | - | 4 | 6 |
| Number of Gears (manual transmission): | 5 | ||
| Length: | 4530 mm | 4590 mm | 4470 mm |
| Width: | 1730 mm | 1830 mm | 1830 mm |
| Width including mirrors: | 2100 mm | 2100 mm | |
| Height: | 1415 mm | 1660-1710 mm | 1660-1680 mm |
| Wheelbase: | 2660 mm | 2728 mm | 2728 mm |
| Front track: | 1430 mm | 1505 mm | 1505 mm |
| Rear (Back) track: | 1400 mm | 1539 mm | 1539 mm |
| Front overhang: | 995 mm | 995 mm | |
| Rear overhang: | 867 mm | 747 mm | |
| Minimum volume of Luggage (trunk): | 490 l | 208 l | 500 l |
| Maximum amount of Luggage (trunk): | 1951 l | 1734 l | |
| Front suspension: | The depreciated rack | Independent, Spring McPherson, with stabilizer | Independent, Spring McPherson, with stabilizer |
| Rear suspension: | Torsion | Semi-independent, spring | Semi-independent, spring |
| Max weight: | 1570 kg | 2260 kg | 2150 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Drum | Disc | Disc |
| Kerb Weight: | 1100 kg | 1600 kg | 1640 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | ||
| Max. roof load: | 80 kg | 80 kg | |
| Permitted trailer load with brakes (8%): | 1700 kg | ||
| Minimum turning circle (turning diameter): | 11.85 m | 11.33 m | |
| Permitted trailer load with brakes (12%): | 1200 kg | 1400 kg | |
| Permitted trailer load without brakes: | 750 kg | 750 kg | |
| Permitted towbar download: | 60 kg | 60 kg | |
| Tire size: | 175/70 R13 | 215/50 R17 | 215/50 R17 |
| Wheel rims size: | R13 | R17 | R17 |