1977 Mercury Cougar vs. 1978 Mercury Grand Marquis
To start off, 1978 Mercury Grand Marquis is newer by 1 year(s). Which means there will be less support and parts availability for 1977 Mercury Cougar. In addition, the cost of maintenance, including insurance, on 1977 Mercury Cougar would be higher. At 5,766 cc (8 cylinders), 1978 Mercury Grand Marquis is equipped with a bigger engine. In terms of performance, 1978 Mercury Grand Marquis (139 HP @ 3200 RPM) has 6 more horse power than 1977 Mercury Cougar. (133 HP @ 3400 RPM) In normal driving conditions, 1978 Mercury Grand Marquis should accelerate faster than 1977 Mercury Cougar. With that said, vehicle weight also plays an important factor in acceleration. 1977 Mercury Cougar weights approximately 145 kg more than 1978 Mercury Grand Marquis.
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, 1978 Mercury Grand Marquis (353 Nm @ 2200 RPM) has 17 more torque (in Nm) than 1977 Mercury Cougar. (336 Nm @ 1600 RPM). This means 1978 Mercury Grand Marquis will have an easier job in driving up hills or pulling heavy equipment than 1977 Mercury Cougar.
Compare all specifications:
| 1977 Mercury Cougar | 1978 Mercury Grand Marquis | |
| Make | Mercury | Mercury |
| Model | Cougar | Grand Marquis |
| Year Released | 1977 | 1978 |
| Body Type | Coupe | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4942 cc | 5766 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 133 HP | 139 HP |
| Engine RPM | 3400 RPM | 3200 RPM |
| Torque | 336 Nm | 353 Nm |
| Torque RPM | 1600 RPM | 2200 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1855 kg | 1710 kg |
| Vehicle Length | 5480 mm | 5400 mm |
| Vehicle Width | 2010 mm | 1980 mm |
| Vehicle Height | 1340 mm | 1390 mm |
| Wheelbase Size | 2910 mm | 2910 mm |
