This is a list of voice commands that can be given to your engineer during play by holding down the radio button, (LB by default on xbox controller). A working mic is obviously required.

This list is extracted from "C:\Program Files (x86)\Steam\steamapps\common\F1 2016\audio\speech_recognition.xml". I have not tested them all. Happy racing.

box this lap
full race update
driver in front
driver behind
who am i racing
tyre status
vehicle condition
weather report
fuel information
pit stop information
set hard tyres
set medium tyres
set soft tyres
set super soft tyres
set ultra soft tyres
set intermediates
set full wets
adjust wing up
set wing balance
change wing down
team mate status
rival status
fastest lap overall
best lap update
last lap time
championship standings
engineer quiet
engineer talk
engineer repeat
fewer updates
more updates
shut up jeff
leave me alone