Comparison BMW 6 Series (E24, facelift 1987) 635 CSi (220 Hp) Automatic & Saab 900 I 2.0 i 16V Turbo (160 Hp) & Porsche Boxster (987) S 3.4 (295 Hp)
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| Brand: | BMW | Saab | Porsche |
| Model: | 6 Series | 900 | Boxster |
| Generation: | 6 Series (E24, facelift 1987) | 900 I | Boxster (987) |
| Engine / modification: | 635 CSi (220 Hp) Automatic | 2.0 i 16V Turbo (160 Hp) | S 3.4 (295 Hp) |
| Production start: | 1987 year | 1985 year | 2006 year |
| Production end: | 1989 year | 1986 year | 2009 year |
| Coupe type: | Coupe | Sedan | Roadster |
| Num. of Doors: | 2 | 4 | 2 |
| Num. of seats: | 4 | 5 | 2 |
| Fuel consumption / economy - urban: | 16.9 l/100 km | 12.2 l/100 km | 15.3 l/100 km |
| Fuel consumption / economy - extra urban: | 7.8 l/100 km | 7.6 l/100 km | 7.8 l/100 km |
| Fuel consumption / economy - combined: | 11.5 l/100 km | 10.8 l/100 km | 10.6 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.41 | 0.30 | |
| Fuel tank volume: | 70 l | 63 l | 64 l |
| Emission standard: | Euro 4 | ||
| CO2 emissions: | 254 g/km | ||
| Power: | 220 hp | 160 hp | 295 hp |
| Max power in: | 5700 rpm. | 5500 rpm. | 6250 rpm. |
| Maximum speed: | 225 km/h | 200 km/h | 272 km/h |
| Acceleration from 0 to 100 km/h: | 8.4 sec | 9.6 sec | 5.4 sec |
| Acceleration from 0 to 200 km/h: | 18.8 sec | ||
| Torque: | 315 Nm @ 4000 rpm. | 255 Nm @ 2500 rpm. | 340 Nm @ 4400-6000 rpm. |
| Stopping distance 100 km/h - 0: | 34.6 m | ||
| Model Engine: | M30 | B202 | M 97/21 |
| Engine position: | Front, longitudinal | Front, transverse | Middle, longitudinal |
| Engine displacement: | 3430 cm3 | 1985 cm3 | 3387 cm3 |
| Engine oil capacity: | 5.8 l | 4 l | 7.75 l |
| Coolant: | 12 l | 10 l | 22.3 l |
| Fuel System: | Multi-point injection | Multi-point injection | Multi-point injection |
| Maximum engine speed: | 7300 rpm. | ||
| Aspiration / Turbine: | Turbocharging | ||
| Position of cylinders: | Inline | Inline | Boxer |
| Valvetrain: | DOHC | ||
| Number of cylinders: | 6 | 4 | 6 |
| Number of valves per cylinder: | 2 | 4 | 4 |
| Compression ratio: | 9.2 | 9.1 | 11.1 |
| Piston Stroke: | 86 mm | 78 mm | 78 mm |
| Cylinder Bore: | 92 mm | 90 mm | 96 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 4 | - | |
| Number of Gears (manual transmission): | 5 | 6 | |
| Length: | 4815 mm | 4680 mm | 4329 mm |
| Width: | 1725 mm | 1690 mm | 1801 mm |
| Width including mirrors: | 1978 mm | ||
| Height: | 1365 mm | 1420 mm | 1292 mm |
| Wheelbase: | 2625 mm | 2515 mm | 2415 mm |
| Front track: | 1435 mm | 1430 mm | 1486 mm |
| Rear (Back) track: | 1465 mm | 1440 mm | 1528 mm |
| Ride height(clearance): | 121 mm | ||
| Minimum volume of Luggage (trunk): | 413 l | 600 l | 130 l |
| Maximum amount of Luggage (trunk): | 1600 l | 280 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Wishbone | |
| Rear suspension: | Independent, spring | Helical spring | |
| Max weight: | 1880 kg | 1740 kg | 1630 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1480 kg | 1315 kg | 1355 kg |
| ABS: | yes | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.7 m | 11.1 m | |
| Tire size: | 220/55 VR 390 | 195/69 VR15 | Front wheel tires: 235/40 ZR 18 |
| Wheel rims size: | R15 | Front wheel rims: 8 J x 18 |