You can find info about old quake live and new quake live sens formula here: http://www.quakelive.com/forum/showthread.php?15458-New-Mouse-Sensitivty-and-Mouse-Accel-Features
The problem is: every engine use they own formula.
And i forgot to say, there is a site in internet (i don't remember the link) with a new raw input, the dev maybe can know how to calc it as "general".