F1 engines? Fixed point. 'Tweaks'? Oh, yeah....when a .01, .001 of a second makes for win v. go home....
Wings 'n things, tire warmers, compounds....an eighth of a turn on the shocks....
...and the sensors RT'ing it to the pit 'puter crew....
....and the nut behind the wheel is the 'variable factor' you can't wrench or screwdriver.....