Solved

Can't change the set up

Any ideas on why can't I change my pre race set up?? I change it and then after saving I come back to the "next race" tab to find it back to default 25/25/neutral. Same with tyres.

I have about 10 minutes before it locks. Someone help lol

Did you get an ideal setup as a daily bonus? 

Yes. Is that why? I was slower on ideal though so wanted to change 

Yes, once you buy or receive the ideal setup from the daily bonus you can't change it. Training lap times can differ, so go for the setup your driver wants to have (=ideal setup).