Heres my time slip from my 1 litre Metro , to make it fair I loaded 4000 pounds in the boot and used nitrous , and you know what , it works.!!!
Now I can get 50mpg and 12.25 second 1/4 miles.
Its basicaly a standard engine with a few small changes , maybe I can do tens if I advance the timing a little and start off in 4th gear --- maybe I also need to add more weight. (and then of course more nitrous)