title: Speed Dependent Damping Control
text: # Speed Dependent Damping Control
  
  Speed Dependent Damping Control (also called SD²C) was an automatic damper system installed on late-1980s and early-1990s Cadillac automobiles. This system firmed up the suspension at 25 mph (40 km/h) and again at 60 mph (97 km/h). The firmest setting was also used when starting from a standstill until 5 mph (8 km/h).
  
  Applications:
  
  ## Computer Command Ride
  
  The semi-active suspension system was updated as Computer Command Ride in 1991. This new system included acceleration, braking rates, and lateral acceleration to the existing vehicle speed metric.
  
  * 1991– Cadillac Fleetwood
  * 1991– Cadillac Eldorado
  * 1991– Cadillac Seville
  * 1991– Cadillac De Ville (optional, standard for 1993)
  * 1992– Oldsmobile Achieva SCX W41
  