AI Difficulty calculator

Go onto Time Trial and set Car Performance to Equal. Get your setups and so on and set the fastest lap times you can. Use the guide attached below to see your speed in comparison to AI difficulty. Portimão isn’t on there however the other 22 tracks should give enough of an answer as to your level. 

Credit to u/phail216 on the r/F1Game subreddit.

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An added note for those who may not understand: time trial setups are often very aggressive in terms of suspension, pressures and sometimes wings.

With suspension, on the suspension screen of the setup menu, on Bahrain you may have Front Supsension: 7, Rear Suspension: 1. This allows for a lot of rotation, which in time trial is great because there is no tyre wear or tyre temperature changes. If you ran this setup in a race, with higher fuel loads, your tyre will degrade faster (also known as  ‘higher deg’) and can also cause temperatures to go too high, losing optimal performance. Tyres on this game work best between 93°C and 97°C. To make it closer to a race setup you could change to Front Suspension: 7, Rear Suspension: 2/3. This adds a lot of stability, causing less degradation (also known as ‘lower deg’) and makes it easier to keep temperatures in an operating window. It will be slower over a single lap, however overall race pace will be increased

Tyre Pressures on Time Trial setups will often have the bars pushed all the way to the right. This again only works because tyre wear and tyre temperatures are controlled. To make it more of a race setup, push the Front Right and Left Tyre Pressures all the way left, which is the lowest tyre pressures (this works on all tracks). For the Rear Right and Left Tyre Pressures, the lower the pressure, the lower the temperatures stay. However this can affect performance and you may not be getting the best from your tyres. I suggest that, in Grand Prix Mode, you do a qualifying session with lower Rear Right and Left Tyre Pressures, and make a note of your time, the tyre wear and tyre temperatures. Then restart the session and do another lap with the pressures increased by one click right and make a note of that time, tyre wear and tyre temperatures. Keep doing this until your times start to decrease. Compare the results and find the best compromise. You want the pressures that keep the tyres in their optimal temperature range (93°C-97°C), have low wear (remember lowest isn’t always optimal for performance) and also provide a competitive and sustainable pace.

Bahrain or Spain are the best tracks to do this because they both have good amounts of low, medium and high speed corners. You wouldn’t have to do with with every track because after a few difference circuits you’ll get a feeling for what might work best, neglecting the need to practice every track.