11,500 LB-FT of Torque?! (No, Not Quite)
General Motors considered him a “moonshot”, and those working on the latest GMC model dubbed him Project Obtainium. We know it as the 2022 GMC Hummer EV and the newly launched pickup includes several interesting tech highlights beyond its fierce claim of 11,500 lb-ft of torque that has been ballyhooed a lot. There’s a lot to dig on this EV off-roader, but let’s first dissect that torque number before checking out the Truck’s Pullout Mode, CrabWalk feature, and more.
GMC Hummer EV 2022: put a couple in it
Let’s start with this marquee number: 11,500 lb-ft of torque. This is the total combined torque applied to the wheels, not the output shafts of the three permanent magnet motors of the Hummer EV. (Initially, all Hummer EVs will have one front engine and two rear engines.) GMC remains cautious about the exact horsepower and torque numbers of the individual engines, but chief engineer Al Oppenheiser has set the output torque of the individual engine at “between 380 and 400 lb-ft”, adding that after multiplying engine torque by single speed transfer ratios of 13.4: 1 up front and 10.1: 1 up to l rear, the number actually exceeds 11,500 lb-ft (however, the front output must be limited to prevent wheel slip). If each engine produced 380 lb-ft, that would multiply to 12,768 lb-ft in total for the wheels. Torque limiting the front to 340 lb-ft and the two rear engines to 350 at launch would be 11,626 lb-ft at the wheels.
2022 GMC Hummer EV: EV torque vs. Duramax diesel twist
The hottest brother of the Hummer EV is the Sierra 4×4 Duramax pickup, which features a 10-speed automatic transmission. With its first gear of 4.70: 1, its axle ratio of 3.24: 1 and a torque converter multiplication factor conservatively estimated at 1.85: 1 when “stalled” at 0 mi / hr, the maximum torque of 460 lb-ft of the Duramax diesel (available from 1,500 to 3,000 rpm) pencils up to nearly 13,000 lb-ft. Of course, that torque converter multiplication goes away when the converter locks up, reducing the total torque of the wheel to just under 7,000 lb-ft. In contrast, Oppenheiser shared that the Hummer EV supported a maximum wheel torque of 0-40 mph. Assuming you outfitted your Sierra Duramax with the X31 Off-Road Pack to get the two-speed transfer case, you could engage the low range and gain an additional 2.72: 1 multiplier. That would give you almost 19,000 lbs. -pi at the wheels, throughout the Duramax’s wide peak torque plateau. That said, using the low range would spin the Sierra’s diesel engine bejeebers to 40 mph, where the Hummer EV’s torque begins to drop.
2022 GMC Hummer EV: power around
Here again, GMC speaks only in round numbers: 1000 hp in total, measured at the three drive shafts. With more gear up front and the desire to be able to do more torque vectoring at the rear, we’re assuming horsepower and torque will be slightly lower for the front engine than for the two rear engines. Figure somewhere between 330/335/335 and 300/350/350.
2022 GMC Hummer EV: WTF mode
However, power is split between the three engines, GMC notes that the Hummer EV accelerates to 60 mph in about four seconds in its default start mode. But you can cut that number down for a second by turning on WTF mode (that’s Watts To Freedom – it’s a family truck!). Selecting this mode initiates a procedure of conditioning the battery and throttle electronics, lowering the suspension to near access mode and creating excitement in the cab with sound effects, graphics and rumbles. from the haptic seat to simulate the excitement that develops as a roller coaster prepares for its first death-defying drop. Once conditioned, press the accelerator and the brake simultaneously, release the brake and take advantage of the g-forces.
2022 GMC Hummer EV: suspension of disbelief
The fully independent suspension of the Hummer EV consists of a ‘short / long arm’ geometry, which is good for 13 inches of wheel travel at the front and rear, as well as air springs and shock absorbers. adaptive steplessly adjustable at all four corners (none of the suspension tips carry the mark of one of the independent suppliers of off-road shocks or suspensions). The Extreme Off-Road Package, standard on all Hummer EV Edition 1 models, includes 18-inch wheels fitted with 35-inch diameter Goodyear Wrangler All Territory MT tires (305 / 70R18). However, enough clearance is provided to switch to 37-inch tires. The set also includes steel underbody armor, rock rails and an 18-camera Virtual Spotter set that includes four underbody cameras – two in the front and two in the rear, with auto capability. -cleaning – to monitor what the tires encounter. Pullout mode helps the Hummer EV get over an obstacle if it gets high-centered by extending the wheels an additional four inches above Terrain mode (to full droop). This feature will become standard in 2023 and can be updated on 2022 models via a free software update. On its 35-inch tires with the suspension set to Terrain mode, the Hummer EV’s approach and departure angles are 44 and 34 degrees, respectively, and the truck can clear 2.5 feet of water. Pullout mode increases the approach angle to 50 degrees, but speeds are extremely limited in this setting as there is no rebound travel available.
2022 GMC Hummer EV: CrabWalk diagonal drive
Another exclusive segment is the four-wheel steering which allows up to 10 degrees of rear wheel steering, well above the 3-4 degrees that most of these systems allow. At low speeds, 10 degrees of steering in the opposite direction of the front wheels tightens the turning radius of the truck to a 37.1-foot sedan-like. Smaller rear steering angles in the same direction as the front tires allow smoother lane changes at highway speeds. Driving up to 10 degrees in the same direction at super low speed – a feature GMC calls CrabWalk – allows diagonal steering and can help the Hummer EV navigate off-road obstacles.