Here's a fun little calculator I just found. You have to scroll about half way down the page and then enter Weight, HP, RPM through lights, Tire diameter and it will estimate your top speed, 1/4 mile times etc... Not the most usefull thing in the world but it's fun to play with... The RPM thing only helps in determining ideal gear ratio and makes no difference in your times....

http://www.hotrodworks.net/hotrodmath/quarter.html

Can you dig it!?

 

great find!