Top 10 10 Of The Slowest Sport Cars by Frédérick Boucher-Gaulin July 12, 2015 Photo: Cargurus4 : In 1985, the Nissan 300ZX was shaped like a wedge and had aspirations to challenge Italian supercars...But it was slow, reaching 100 km/h in 8 seconds flat. « PreviousNext » Share on Facebook Share: