ON A ROLL
ON PAGE 86 of this issue, Fraser Stronach explains the working of Toyota’s KDSS sway bar system. Nissan’s Hydraulic Body Motion Control (HBMC) is similar, but it takes it a step further and its benefits are greater.
For decades, off-road drivers have removed or disconnected their vehicles’ anti-sway bars to improve the wheel travel of the suspension and off-road ability. That’s all good, but the problem lies when you hit the road to go home and the vehicle rolls around like a tall cork in a rough sea. Anti-sway or stabiliser bars control body roll but limit wheel travel.
Nissan’s full-independent, coil-spring suspension with HBMC does away with sway bars. Instead, the shock absorbers are linked by hydraulic lines and are able to pressurise each side of the vehicle to steady the ship. This action is speeddependent so the shocks pressurise at road speeds to maintain a flat stance, but can soften up at low, off-road speeds to allow the suspension to droop to maximum effect.
Before you write HBMC off as a system that will prevent you from raising the ride height or fitting bigger tyres, specialist 4x4 shops such as Melbourne’s On Track 4x4 have developed a kit to give the system a 50mm lift. You can’t build a hurdle that the Australian 4x4 aftermarket industry can’t conquer!