• The Hennessey Maximus Jeep Gladiator Drops a Ton of Power Between the Engine and the Wheels: Video

It should be renamed from Maximus 1000 to Maximus 692

Do you remember the Maximus 1000? Hennessey injected the Jeep Gladiator with steroids and renamed it the Maximus 1000 earlier this year. Although it looks absolutely stunning in black, the truck’s biggest change was under the hood where the tuner decided to swap the stock Pentastar engine with a Hellcat mill.

The engine was then further tuned to churn out 1,000 horsepower and now Hennessey has released a video of the Maximus doing a dyno run. Although you’d expect it to rev in all its glory, the Maximus actually didn’t make a 1,000 horses. It was a lot less, and honestly, a tad bit disappointing.

30-Percent Parasitic Power Drop Is Double of What’s Expected

The dyno graph indicated a parasitic loss of over 300 ponies between the engine and the wheels. Parasitic loss is basically the difference between the tuner or automaker-said standard of horsepower and the output measured at the wheels. It’s caused by a lot of factors including,

  • Design of the transmission
  • Driveline components
  • Friction, drag, and inertia within the driveline components
  • Slippage in the transmission, driveshaft, or differentials
The Maximus only made a maximum of 692 horsepower at 6,200 rpm and 693 pound-feet of torque at 3,500 rpm on the dyno.

Usually, rear-wheel-drive vehicles lose about 15-percent of the power between the engine and the wheels on such runs. But the Maximus lost almost double that number. However, Hennessey has said the monster is equipped with heavy-duty off-road components that justify the numbers. Remember, the off-road tires are larger, and thus create more friction on the surface they are tracking across.

The Beefy Monster Still Has Touches of The Original Gladiator

The Hennessey Maximus Jeep Gladiator Drops a Ton of Power Between the Engine and the Wheels: Video
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On the outside, the Maximus looks like a beast:

  • It retains the signature seven-slat grille
  • The all-black look makes it look elegant
  • It sports Maximus-exclusive bumpers in the front and in the back
  • The LED light bar on the roof and bumper helps with added lighting
  • The stainless steel exhaust pipe is responsible for those mighty grunts and roars
  • The LED taillights come as standard on this truck

Hellcat Replaces Pentastar For Good

The Hennessey Maximus Jeep Gladiator Drops a Ton of Power Between the Engine and the Wheels: Video
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The truck may still have hints of the Jeep Gladiator’s exterior, but it is completely different under the hood. As mentioned earlier, the 3.6-liter, V-6 Pentastar engine from the Gladiator that produces 285 horses and 260 pound-feet of torque has been replaced by the Hellcat engine.

Yes, FCA’s 6.2-liter, supercharged V-8 engine has been plonked under the hood of the Hennessey Maximus.

In standard form, the engine churns out 707 horses and 650 pound-feet of torque. But it is imperative for a tuner like Hennessey to fiddle with the specs. The company decided to put this mill on HPE1000 steroids that bumped up the figures to 1,000 horsepower and 933 pound-feet of torque. So, this makes it almost four times more powerful than the standard Gladiator. Yet, seeing the dyno run, this figure is only accurate at the crank and that much power never actually makes it to the ground.

Jeep Gladiator vs. Hennessey Maximus
2020 Jeep Gladiator 2020 Hennessey Maximus Jeep Gladiator Truck
Displacement: 3.6 liters V-6 6.2 liters V-8
Power: 285 horsepower 1,000 horsepower V-8
Torque: 260 pound-feet 933 pound-feet V-8
Ground clearance: 11.1 inches 17.1 inches
The Hennessey Maximus Jeep Gladiator Drops a Ton of Power Between the Engine and the Wheels: Video
- image 875641

Power is sent to the ground via an eight-speed automatic transmission, that may or may not be an FCA unit. Hennessey has also added new elements such as an ECU, radiator, and fuel system, held up using new wiring harnesses. With all these add-ons, the Maximus is not a down-to-earth vehicle. An upgraded suspension system with a lift kit raises the truck six more inches off the ground. The drool-worthy BFG 20-inch KD Off-Road Tires further help it go higher off the road. The ground clearance now stands at 17.1 inches; talk about a first-floor view from the driver’s seat!

Final Thoughts

The Hennessey Maximus Jeep Gladiator Drops a Ton of Power Between the Engine and the Wheels: Video
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Hennessey has decided to produce just two units of the truck per month and will limit the production to 24 units overall.

Naturally, this exclusive offering will attract a high price. How much, you ask? $200,000 a pop.

To put things into perspective, Jeep offers the standard Gladiator with a starting sticker price of $35,000. Hennessey is also offering a 3-year/36,000 mile warranty on the Maximus. While the dyno run may have indicated a huge loss, I don’t think it’ll deter the decision of any potential customer. It is still an exclusive, niche vehicle that can make heads turn. What are your thoughts on the dyno test? Share them with us in the comments section below.

Sidd Dhimaan
Sidd Dhimaan
Senior Editor, Truck Expert, EV Expert - sidd@topspeed.com
Sidd joined the Topspeed.com team in 2017 as an intern and in less than a year he earned a full-time position as an associate editor and junior automotive expert. Fast forward to today, and he is currently serving as a senior editor, pickup truck expert, and EV expert.  Read full bio
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