Hi!
You got it all a bit wrong, but I was more confused than you before I understood it all, so don't worry!
A LUT is just a table with 2 rows of entries, that tell the game to output a different ffb level than normal.
Like this:
1 | 15
2 | 15.8
3 | 16.5
.
.
100 | 100
The Logitech G25/27/29 all have about 15% dead zone so my little example would simply push the first percent of ffb to these 15%.
I would simply save this table, which would be written in a standard txt file as example.lut and put this example.lut file into the documents/assetto corsa/cfg folder.
Then open the ff_post_processing.ini and edit the type to lut and the filename (last line) to example.lut
This tells the game to use this example.lut
My lut files are custom. I've created the values manually in excel.
To see what I was doing, I created a standard excel graph diagram so see if my values would create a smooth curve or have too harsh steps that would feel weird.
Lot of testing hours done!
The lut generator on the other hand creates a lut automatically, based on the wheel check results.
But in my opinion, wheel check is very questionable for everything apart the dead zone test.
And I didn't like the feeling at all. Felt worse than without it.
That's why I then learnt what exactly a lut does and created my own lut, manually with a lot of testing.
My luts are just a smoothed, curved minimum force. The minimum force setting always felt like either too much or not enough.
It's because it's not smooth.. The ffb simply starts at the level that you set and that's it.
Example:
Min force setting 15%:
FFB starts at 15%, then goes linearly to 100%.
My luts: ffb starts at 10% but ramps up smooth, but quickly to about 20% and then goes linearly to 100%.
So my lut feels smoother but also tighter than the min force setting.
The lut generator on the other hand does weird stuff... Not linear at all and it feels awkward. That's because wheelcheck measures how far the wheel rotates on its own, after you throw it with an ffb pulse.
But that doesn't have much to do with the ffb strength you're feeling, when holding against the ffb.
So what do you do with my zip file:
You just download it, extract it, go into the folder for your wheel, drag & drop the 2 files in that folder into your documents/assetto corsa/cfg folder and start the game