While I totally understand what Karl is saying there, and my own stab at the theory would say exactly the same, my experience suggests that a worse 60ft on a turbo car (especially a big turbo) often leads to a higher terminal speed, as per the thread starters results.

A friend of mine has an 11 seconds viva that he has a massive amount of data with and there is a massively strong correlation for him between higher 60fts and higher terminals.

Can only assume its due to spool time on the turbo, as I can think of no other reason for the effect that would make any sense.

Ie Karls assumption that a worse 60ft time means you are going slowing at the 60ft isnt always correct, if you go very slowly for the first 30ft and during that time the turbo spools well it will accelerate better for the next 30ft so although you have taken longer to get to 60ft you have done so at either the same or a higher speed and with the turbo spinning faster at the time.