2007 BMW 745 vs. 1991 Renault 21
To start off, 2007 BMW 745 is newer by 16 year(s). Which means there will be less support and parts availability for 1991 Renault 21. In addition, the cost of maintenance, including insurance, on 1991 Renault 21 would be higher. At 4,423 cc (8 cylinders), 2007 BMW 745 is equipped with a bigger engine. In terms of performance, 2007 BMW 745 (326 HP @ 3800 RPM) has 251 more horse power than 1991 Renault 21. (75 HP @ 5000 RPM). In normal driving conditions, 2007 BMW 745 should accelerate faster than 1991 Renault 21. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW 745 weights approximately 1095 kg more than 1991 Renault 21. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 BMW 745 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2007 BMW 745. However, in wet, icy, snow, or gravel driving conditions, 1991 Renault 21, being front wheel drive (FWD), will offer much better control with better grip. 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, 2007 BMW 745 (700 Nm @ 1900 RPM) has 571 more torque (in Nm) than 1991 Renault 21. (129 Nm @ 3250 RPM). This means 2007 BMW 745 will have an easier job in driving up hills or pulling heavy equipment than 1991 Renault 21. 2007 BMW 745 has automatic transmission and 1991 Renault 21 has manual transmission. 1991 Renault 21 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 BMW 745 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2007 BMW 745 | 1991 Renault 21 | |
| Make | BMW | Renault |
| Model | 745 | 21 |
| Year Released | 2007 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 4423 cc | 1721 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 326 HP | 75 HP |
| Engine RPM | 3800 RPM | 5000 RPM |
| Torque | 700 Nm | 129 Nm |
| Torque RPM | 1900 RPM | 3250 RPM |
| Engine Bore Size | 87 mm | 81 mm |
| Engine Stroke Size | 93 mm | 83.5 mm |
| Engine Compression Ratio | 17.0:1 | 9.2:1 |
| Fuel Type | Diesel | Gasoline |
| Drive Type | Rear | Front |
| Transmission Type | Automatic | Manual |
| Vehicle Weight | 2115 kg | 1020 kg |
| Vehicle Length | 5050 mm | 4650 mm |
| Vehicle Width | 1910 mm | 1720 mm |
| Vehicle Height | 1500 mm | 1430 mm |
| Wheelbase Size | 3000 mm | 2820 mm |
