Well, here's a link from our very own forum
http://forums.pelicanparts.com/porsche-928-technical-forum/312576-euro-model-928-porsches.html
83 US 4spd A/T: 0-60: 7.2, 1/4 mile: 15.5
83 US 5spd: 0-60: 6.8, 1/4 mile: 15.2
80 Euro 3spd A/T: 0-60: 7.7, 1/4 mile: 16.2
80 Euro 5spd: 0-60: 6.6, 1/4 mile: 15.2
85 US 4spd A/T: 6.8, 1/4 mile: 14.9
85 US 5spd: 0-60: 6.3, 1/4 mile: 14.2