The American tuner Hennessey is offering tuning packages that unlock up to 880kW from the supercharged V8

Hennessey Performance has released details of new tuning packages offering 635kW, 754kW and a staggering 880kW for the Jeep Grand Cherokee Trackhawk family SUV. The 466kW Bentley Bentayga Speed’s ‘world’s fastest SUV’ title might be at risk.

The ‘lowest-powered’ HPE850 tuning package fiddles with the standard Trackhawk’s ECU, adds a high flow air intake system and upgrades the supercharger pulley to produce a higher 14psi of boost. Thanks to these updates, the upgraded Trackhawk will hit 100km/h in 2.9secs, the same as a $3m Aston Martin Vulcan. The quarter-mile time is a quoted 10.9secs at 200km/h.

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The intermediate upgrade is HPE1000 helping produce, you guessed it, just over 745kW and 1313Nm of torque. Further modifications to reach this power output are required, comprising larger capacity 4.5-litre supercharger, high-flow fuel injectors, a fuel pump upgrade, new ECU, high-flow air intake system and more. Performance figures come in at 2.7secs for the 0-100km/h sprint, and the quarter mile comes in 10.7secs at 212km/h.

The final, and most powerful package is HPE1200, giving the family SUV a monstrous 747wkW or 880kW from the crank, with torque rated at 1355Nm. As you might imagine, some quite significant modifications are required for this much power. Adding to the same upgraded 4.5-litre supercharger from the HPE1000 package is an upgraded pulley, a modified throttle body, a selection of forged internals within the engine block, a new high-flow exhaust system and more. These additions result in a quoted 0-100km/h time of just 2.3sec, making it one of the most accelerative cars on the planet, in line with the Bugatti Chiron. The quarter mile is covered in a quoted 9.6secs at 233km/h, and it’ll carry on to over 321km/h if the tyres don’t explode first.

What isn’t part of Hennessey’s upgrades is the chassis, which one might argue was already quite close, if not already over its comfort zone in standard Trackhawk form. It’s also worth noting the Grand Cherokee’s underlying chassis is one able to be traced back to a mid-naughties Mercedes ML.

All performance figures are based on times recorded on a prepped drag strip with drag radial rear tyres, so smoking all four wheels from the traffic lights is probably possible, if not really recommended. Pricing details for the packages can be provided upon request.