GM's "Quadrasteer" is back, with new tricks up its sleeve.
After months of anticipation, GM is finally gearing up to reveal the pure-electric GMC Hummer, and just ahead of its debut, a new report has shed some light on how its unique "Crab Mode" feature works.
According to GM-Trucks, the Hummer will pack a rear-wheel steering system similar to GM's Quadrasteer from the early 2000s. If you don't recall, that's the system GM offered on its full-size truck models of the time, which turns the rear wheels independently of the front, turning opposite the front wheels at slower speeds, and with the fronts at higher speeds. It gave the GMC Sierra Denali about the turning radius of a 3-door Saturn coupe at parking lot speeds, and extra stability on the highway.
The Hummer's new system won't have quite the range of GM's older Quadrasteer, according to GM-Trucks; where the old system could turn the rear wheels up to 15 degrees in either direction, the Hummer will reportedly be limited to 10 degrees. That's still more than double the range of systems like ZF's current Active Kinematics Control, and enough to tighten the Hummer's turning radius significantly. (A new, next-generation version of ZF's system that's soon to launch manages the same 10 degrees of range as the Hummer.)
And then, there's the actual "Crab Mode" itself, which is what really sets the Hummer's system apart from Quadrasteer.
The new GMC Hummer will give drivers control over the rear-wheel steering in a way that Quadrasteer didn't, not only allowing the system to be toggled on and off, but also giving them on-demand access to Crab Mode, which turns the rear wheels in the same direction as the fronts even at low speeds. It's intended to be a boon to off-road maneuverability, gracing the big truck and SUV with the ability to track diagonally around obstacles.
The GMC Hummer will be revealed tonight, October 20, at 8:00 pm ET.