1990 Jaguar XJS vs. 1978 Mercury Grand Marquis
To start off, 1990 Jaguar XJS is newer by 12 year(s). Which means there will be less support and parts availability for 1978 Mercury Grand Marquis. In addition, the cost of maintenance, including insurance, on 1978 Mercury Grand Marquis would be higher. At 5,343 cc (12 cylinders), 1990 Jaguar XJS is equipped with a bigger engine. In terms of performance, 1990 Jaguar XJS (291 HP @ 5500 RPM) has 162 more horse power than 1978 Mercury Grand Marquis. (129 HP @ 3600 RPM). In normal driving conditions, 1990 Jaguar XJS should accelerate faster than 1978 Mercury Grand Marquis. With that said, vehicle weight also plays an important factor in acceleration. 1990 Jaguar XJS weights approximately 242 kg more than 1978 Mercury Grand Marquis. 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, 1990 Jaguar XJS (440 Nm @ 3250 RPM) has 137 more torque (in Nm) than 1978 Mercury Grand Marquis. (303 Nm @ 2600 RPM). This means 1990 Jaguar XJS will have an easier job in driving up hills or pulling heavy equipment than 1978 Mercury Grand Marquis.
Compare all specifications:
| 1990 Jaguar XJS | 1978 Mercury Grand Marquis | |
| Make | Jaguar | Mercury |
| Model | XJS | Grand Marquis |
| Year Released | 1990 | 1978 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 5343 cc | 4942 cc |
| Engine Cylinders | 12 cylinders | 8 cylinders |
| Engine Type | V | V |
| Horse Power | 291 HP | 129 HP |
| Engine RPM | 5500 RPM | 3600 RPM |
| Torque | 440 Nm | 303 Nm |
| Torque RPM | 3250 RPM | 2600 RPM |
| Engine Bore Size | 90 mm | 101.6 mm |
| Engine Stroke Size | 70 mm | 76.2 mm |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1932 kg | 1690 kg |
| Vehicle Length | 4770 mm | 5400 mm |
| Vehicle Width | 1800 mm | 1980 mm |
| Vehicle Height | 1260 mm | 1390 mm |
| Wheelbase Size | 2600 mm | 2910 mm |
