Hi @CarlosPrieto,
please consider the valuable post from @Ali_Arafat: Lift/Downforce calculation help
If you are interested in the simulations of Formula car simulations in general I would recommend those workshops which also deal with the design parameter you are looking for. At least to a certain extend.
• F1 Workshop
• Formula Student SAE Workshop
We have a lot of experts here who definitely know more about F1 cars and the design parameters per se than I do 
So I hope some of the guys here join this thread to help you 
Have a nice weekend!