1990 BMW 850 vs. 2006 BMW 645
To start off, 2006 BMW 645 is newer by 16 year(s). Which means there will be less support and parts availability for 1990 BMW 850. In addition, the cost of maintenance, including insurance, on 1990 BMW 850 would be higher. At 4,988 cc (12 cylinders), 1990 BMW 850 is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP @ 6100 RPM) has 31 more horse power than 1990 BMW 850. (297 HP @ 5200 RPM) In normal driving conditions, 2006 BMW 645 should accelerate faster than 1990 BMW 850. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 25 kg more than 1990 BMW 850. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, both vehicles can yield 450 Nm of torque. So under normal driving conditions, the ability to climb up hills and pull heavy equipment should be relatively similar for both vehicles. 2006 BMW 645 has automatic transmission and 1990 BMW 850 has manual transmission. 1990 BMW 850 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2006 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1990 BMW 850 | 2006 BMW 645 | |
| Make | BMW | BMW |
| Model | 850 | 645 |
| Year Released | 1990 | 2006 |
| Body Type | Coupe | Convertible |
| Engine Position | Front | Front |
| Engine Size | 4988 cc | 4398 cc |
| Engine Cylinders | 12 cylinders | 8 cylinders |
| Engine Type | V | V |
| Horse Power | 297 HP | 328 HP |
| Engine RPM | 5200 RPM | 6100 RPM |
| Torque | 450 Nm | 450 Nm |
| Torque RPM | 4100 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 75 mm | 82.7 mm |
| Engine Compression Ratio | 8.8:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1790 kg | 1815 kg |
| Vehicle Length | 4790 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1350 mm | 1380 mm |
| Wheelbase Size | 2690 mm | 2790 mm |
| Fuel Tank Capacity | 52 L | 70 L |
