This is for the "scenic" layout of the fictional union island track found on this site.
It comes with a surfaces.ini to remove dirt effect at the 1/5 distance of the track, if you want to keep the dirt effect, don't overwrite the file.
tested with 1923 gp cars. abarth 500, alfa romeo 33 stradale 67 also work, but overtaking is much more difficult. for faster cars they take off too easily due to crest or bumps
It comes with a surfaces.ini to remove dirt effect at the 1/5 distance of the track, if you want to keep the dirt effect, don't overwrite the file.
tested with 1923 gp cars. abarth 500, alfa romeo 33 stradale 67 also work, but overtaking is much more difficult. for faster cars they take off too easily due to crest or bumps