For some reason when I do a single player race, I can only add 23 AI, even when I'm not racing, and I can't figure out why.

Track limitation?
https://en.lfsmanual.net/wiki/Tracks

https://en.lfsmanual.net/wiki/Game_modes

Old link check single player think arround 2015 ai's got updated and got a max for 24 (if u also race u can ad 23)

Since the subject arose ... ... is there still a way to add 32 cars?
I read in the forum that could be done before, but I never got it.
...I play only in 1 player mode ...

Quote from V_Ro :

is there still a way to add 32 cars?

Not that I know. But I invite u to play online most fun, harder competition and u get to know peeps

I found the issue, apparently LFS doesn't like an AI having the same name as the player (Even if the player is not racing) and refused to add it to the grid.

Going from AI doing AI things to real people doing real people things all around you is quite an eye-opener

Quote from RC-Maus :

Not that I know. But I invite u to play online most fun, harder competition and u get to know peeps

Thanks...
My current internet connection is very bad...

I can only play in 1 player mode ...However, I am very happy with the simple fact of using my steering wheel in LFS.