F1 2010 ¿Where I can change the grip on the track according to its wear?

[luispsoe]

¿Where I can change the grip on the track according to its wear?
more understeer and oversteer

 

[David Kaye]

Database, surface material's, tyre compounds to name a few then a few various random variables in the db and you should be done

 

[luispsoe]

which is the file where is it?

¿cual es el archivo que tengo que modificar?