Mouse Sensitivity

[The Killer Nacho]

I'm trying to convert my mouse sensitivity from counter strike to 8BDM. To my understanding counter strike's source engine is based off the quake engine, which is in turn based off the doom engine. They all supposedly use the same method for reading mouse input and settings, so I was hoping it would be 1 to 1. However, when I use my source engine sens at the same yaw/pitch and mouse_sensitivity the crosshair barely moves. I was wondering if there was an exact conversion factor or method to find one. I am sure that no mouse accel is involved in either case.

Thanks in advance for any help.