I did something similar here
http://www.torquecars.co.uk/Tuning/q..._mile_time.php I think mine is more accurate though!
letsTorquebhp does 0-60 times - it is not accurate - I played with the code for a 0-60 time myself a while back and gave up as there are too many factors to even get a ball park but as you say its good fun!