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The front and rear suspension of the Q50 uses coil springs for better ride, handling and control than the S90, which uses transverse leafs springs in the rear. Coil springs compress more progressively and offer more suspension travel for a smoother ride with less bottoming out.
The Q50’s optional drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The S90 doesn’t offer drift compensation steering.
The Q50 handles at .95 G’s, while the S90 T6 Momentum pulls only .90 G’s of cornering force in a Car and Driver skidpad test.
The Q50 executes Motor Trend’s “Figure Eight” maneuver quicker than the S90 T6 Inscription (25.5 seconds @ .76 average G’s vs. 26.3 seconds @ .68 average G’s).
For better maneuverability, the Q50’s turning circle is 2 feet tighter than the S90 18” wheels’ (36.7 feet vs. 38.7 feet). The Q50 AWD’s turning circle is 2.6 feet tighter than the S90 19” wheels’ (37.4 feet vs. 40 feet).