Supercharged Grand Cherokee accelerates like an ultracar.
The Jeep Grand Cherokee Trackhawk stock version is a performance beast with 707 horsepower (527 Kilowatts) at 60 mph (96 km/h) in 3.5 seconds. These numbers are impressive but not enough for Hennessey. Hennessey offers a tuning package which increases the output to an incredible 1,012 horsepower (755 kW) with 969 pound-feet (1.314 Newton-meters). A video now shows what happens when you add 305 horsepower (227 kW), to the Hellcat-powered Grand Cherokee.
The Trackhawk’s upgraded version can reach 60 mph in 2.7 seconds, which is 0.8 seconds faster than stock. It also completes the quarter mile in 10.7 seconds (132 mph) at 132 mph (212 km/h). Hennessey’s 1,012-hp tune to the ChallengerSRT Hellcat covers the same distance in 9.9 seconds (141 mph) and 227 kph. For those who need more cargo space and utility than Dodge’s two door coupe can offer, the Jeep is still a better option
Hennessey had to add quite a bit of equipment in order to improve the Trackhawk’s performance. The SUV’s stock supercharger of 2.38 liters is now running at 11.6 PSI. Instead, a 4.5-liter unit pushes out 14 PSI. The 6.2-liter supercharged V8 breathes better thanks to a better flow intake and stainless steel long tub headers. The engine receives enough gasoline to keep pace with all the improvements thanks to upgraded injectors and a brand new fuel pump. Hennessey reviews the engine management and tunes the entire setup on a Dyno to get maximum performance.
Hennessey does not offer the Trackhawk’s top speed, but it would still be interesting to see if the upgrades make the SUV more powerful than the Lamborghini Urus, which is the closest performance rival. The Lambo can reach a top speed at 186 mph (390 kph), which is slightly less than the supercharged Grand Cherokee’s maximum velocity of 180 mph (295 kph). The extra 6 mph (10 kmph) could be achieved with an extra 305 horsepower.