Comparison Pontiac Grand AM (H) 2.3 (150 Hp) Quad 4 & Opel Astra F Cabrio 1.6i Eco (71 Hp) & Porsche Cayman (987c, facelift 2009) R 3.4 (330 Hp)
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| Brand: | Pontiac | Opel | Porsche |
| Model: | Grand AM | Astra | Cayman |
| Generation: | Grand AM (H) | Astra F Cabrio | Cayman (987c, facelift 2009) |
| Engine / modification: | 2.3 (150 Hp) Quad 4 | 1.6i Eco (71 Hp) | R 3.4 (330 Hp) |
| Production start: | 1988 year | 1993 year | 2011 year |
| Production end: | 1989 year | 1996 year | 2012 year |
| Coupe type: | Sedan | Cabriolet | Coupe |
| Num. of Doors: | 4 | 2 | 2 |
| Num. of seats: | 5 | 4 | 2 |
| Fuel consumption / economy - urban: | 8.5 l/100 km | ||
| Fuel consumption / economy - extra urban: | 6.4 l/100 km | ||
| Fuel consumption / economy - combined: | 7.6 l/100 km | ||
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.30 | |
| Fuel tank volume: | 52 l | 54 l | |
| Emission standard: | Euro 5 | ||
| Power: | 150 hp | 71 hp | 330 hp |
| Max power in: | 6000 rpm. | 5000 rpm. | 7400 rpm. |
| Maximum speed: | 170 km/h | 282 km/h | |
| Acceleration from 0 to 100 km/h: | 14.5 sec | 5 sec | |
| Acceleration from 0 to 200 km/h: | 17.2 sec | ||
| Torque: | 190 Nm/4800 rpm. | 128 Nm/2800 rpm. | 370 Nm @ 4750 rpm. |
| Stopping distance 100 km/h - 0: | 33.7 m | ||
| stopping distance 200 km/h - 0: | 142.7 m | ||
| Model Engine: | MA1.21 | ||
| Engine position: | Front, transverse | Front, transverse | Middle, longitudinal |
| Engine displacement: | 2260 cm3 | 1598 cm3 | 3436 cm3 |
| Engine oil capacity: | 7.5 l | ||
| Coolant: | 23-25 l | ||
| Fuel System: | Multi-point injection | Mono-point injection | Direct injection |
| Maximum engine speed: | 7500 rpm. | ||
| Position of cylinders: | Inline | Inline | Boxer |
| Valvetrain: | DOHC | OHC | DOHC |
| Number of cylinders: | 4 | 4 | 6 |
| Number of valves per cylinder: | 4 | 2 | 4 |
| Compression ratio: | 9.5 | 10 | 12.5 |
| Piston Stroke: | 85 mm | 81.5 mm | 77.5 mm |
| Cylinder Bore: | 92 mm | 79 mm | 97 mm |
| Wheel Drive: | Front wheel drive | Front wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 3 | 4 | |
| Number of Gears (manual transmission): | 5 | 5 | 6 |
| Length: | 4510 mm | 4239 mm | 4347 mm |
| Width: | 1690 mm | 1684 mm | 1801 mm |
| Width including mirrors: | 1978 mm | ||
| Height: | 1340 mm | 1400 mm | 1285 mm |
| Wheelbase: | 2630 mm | 2517 mm | 2415 mm |
| Front track: | 1424 mm | 1490 mm | |
| Rear (Back) track: | 1423 mm | 1530 mm | |
| Ride height(clearance): | 140 mm | 103 mm | |
| Minimum volume of Luggage (trunk): | 390 l | 260 l | |
| Maximum amount of Luggage (trunk): | 720 l | ||
| Front suspension: | Wishbone | Independent type McPherson | |
| Rear suspension: | Suspension with traction connecting levers | McPherson | |
| Max weight: | 1555 kg | 1620 kg | |
| Front brakes: | Disc | Ventilated discs | |
| Rear brakes: | Drum | Drum | |
| Kerb Weight: | 1065 kg | 1295 kg | |
| ABS: | yes | ||
| Steering type: | Steering rack and pinion | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Hydraulic Steering | |
| Max. roof load: | 60 kg | ||
| Minimum turning circle (turning diameter): | 11.1 m | ||
| Tire size: | 195/60 R15 | Front wheel tires: 235/35 ZR 19 | |
| Wheel rims size: | R15 | Front wheel rims: 8.5 J x 19 |