There are already a few places where you can find instructions on how to create new AI sets, but a most of the ones I found where vague or lacked illustrations. You could also go explore the game files by yourself, or download a mod and try to see how it works, but the BagEdit tool can be a bit intimidating if, like me, you're not especially tech-savvy.

The goal of this guide is to show everyone how easy it is to create an AI set.

I want to adress special thanks to youtuber Video Game Perspectives because his video "My First Wreckfest AI Set - A Tutorial" is how I learnt how to do it. However I prefer written tutorials over video tutorials, and as I think I'm not the only one I decided to make this one.

I also want to apologise in advance for any weird syntax or choice of words, as english isn't my first language.

First, navigate to the BagEdit file. The path to it should normally be Steam/steamapps/common/Wreckfest/BagEdit.
Open BagEditCommunity.exe


Upon opening BagEditCommunity.exe, it should look something like this except maybe with each space completely empty.

If it is empty, navigate to "Open" in the "File" tab.


And open any file from Wreckfest. Since we want to create a new AI set, I'm going to navigate to Wreckfest/data/property/career/ai_sets and open one of the base AI sets.


If you selected ai_set_random.aist like me, BagEdit should now look like this:

If you opened something else than an AI set, you can always navigate to the file containing AI sets by following the same path in the left column and unfolding data>property>career>ai_sets

Right click on any of the AI sets and select "File Duplicate...". I usually choose the "random" AI set but it really doesn't matter.


BagEdit will then open a new window and ask you to name your mod. For this example I'm going to create an AI set with only Kilerbees and Warwagons so I chose to name it "Bees and Bears". This is the name that will appear in the in-game mod manager.
Once you've given a name to your mod, click the "OK" button.


You can then change the filename for your AI set to differentiate it from others in the same mod.
You have to keep the same naming scheme of ai_set_[NAME].
Once you've given your new file the desired name, click "OK".


BagEdit should now look like this:


You can change the AI set name (here in the red box). This is the name that will be shown in game, so don't forget it!
The "Display Order" line is also important, as it will determine in what order the AI sets appear in game. If this is your first custom AI set, you can change it to 11. so that it will appear after all other sets except the special vehicles sets, which are all set to 1000. As I already have a bunch of custom sets, I'll set it to 19. If two "Display Order" overlap, the game will sort each overlapping set by alphabetical order.
Once you've given your set a new name, click "Update Reference List" (here in the green box). This will open a menu where we'll be able to choose which cars we want to include in our modded AI set.

Clicking "Update Reference List" will open this window. The first thing to do is to click "Select None" in the bottom right of the window to untick everything.


Once this is done, we'll have to find each car's folder and tick what AI we want exactly. For my mod I want only B class cars (this is completely arbitrary for the sake of this example). Killerbees will have Folkrace and Banger AIs, while Warwagons will have only Derby AIs. This way we should have more Killerbees than Warwagons on the track, and the Warwagons will be heavily armored and more aggressive.
The filename for standard KillerBees is 02_european_01 (02_european being the racing variant), so I'm gonna find that file and tick banger_b and folkrace_b.
If I wanted all possible AIs for the Killerbee I could have simply ticked the 02_european_01 box and it would have automatically ticked all Killerbee AIs.
The process is almost identical for Warwagons. I have to find the 24_american folde and tick the right box. One slight difference, though: the Warwagon base class when you buy it in-game is B, so there's no "derby_b" AI. It's simply named "derby".
Once you've selected all cars you want your AI set to use, all you have to do is click "OK".

If you want to create another set in the same mod, all you have to do is right click your newly created set and duplicate it, then repeat the steps from there: change its name and display order, select cars...

Your custom AI set should be ready to use!
All you have left to do is to activate it with the in-game mod manager and launch it for a test run.

It annoyed me a bit when I realized I'd have to go through each vehicle file to see which was which, so I did a list of all of them and decided to share it so future modders wouldn't have to do it themselves. Here it is:

Except for the Limo, special vehicles have more straightforward names and are easy to recognise.

*I included the Venom in the list for completion's sake, but it isn't accessible from the "Update Reference List" menu to be added to custom AI sets.
You may also have noticed the 12th and 23rd cars are missing. These emplacements are used for DLC cars (I know 23 is the Bandit, I don't know what's 12 or if it's already used).
DLC cars are hidden by finnish voodoo and I have no idea how to access them, though others have found ways.