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The i7 offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The S90 doesn’t offer an active sway bar system.
The front and rear suspension of the i7 uses air springs for a smoother, controlled ride than the S90, which uses coil springs in front and transverse leafs springs in the rear. Air springs maintain proper ride height and ride more smoothly.
The i7 offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Volvo doesn’t offer an active suspension on the S90.
The i7 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The i7’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The S90 doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the i7’s wheelbase is 6.1 inches longer than on the S90 (126.6 inches vs. 120.5 inches).
For better handling and stability, the average track (width between the wheels) on the i7 is 1.9 inches wider in the front and 1.1 inches wider in the rear than the track on the S90.
The i7 xDrive60 handles at .95 G’s, while the S90 pulls only .88 G’s of cornering force in a Motor Trend skidpad test.
The i7 xDrive60 executes Motor Trend’s “Figure Eight” maneuver 1.8 seconds quicker than the S90 (24.5 seconds @ .78 average G’s vs. 26.3 seconds @ .68 average G’s).