Deep Dive - @ScuderiaFerrari SF-25 revised rear suspension: Besides the likely (hidden) mods to spring/dampers & their actuation, upper WB fwd arm inboard pick up was lowered by ~50 mm, resulting in the roll ctr. ht. increase of ~20 mm to ~60 mm. Kinematic analysis comparison:
The new suspension kinematics maintains a relatively neutral camber gain curve (with -1.75 deg. static setting) which is typical for rear suspension requiring keeping rear tires square to the road surface to ensure maximum tire contact for traction during acceleration…
Bump steer is slightly increased at the extremes of bump and rebound, while lateral scrub peaks shifted from bounce travel to rebound travel…
The lateral instant center was raised ~40 mm to ~310 mm. As the IC height is below the wheel center, this design actually provides a slight pro-squat design at ~ -3.5 deg (pretty much unchanged) though some anti-squat restoring torque is present if CG below Fwb line-of-action…
Braking anti-rise effect, though, is noticeably increased with the reaction vector angle basically doubling from ~12 deg. to ~26 deg. So while it was assumed that Merc and Ferrari changed their rear suspension to increase anti-squat, it’s mostly the anti-rise that was targeted.
