A book about Italian cars.
Rather recent (less than 10 years).
from a small publisher (Self-published).
no publisher name on the cover.
A well-known Italian motoring book author.
I sent you some scans of it.
Title is rather obvious.
The clue about your grandmother is totally obscure, unless you are suggesting it's a name coming from Sardinia, like yours.
I sent you some scans, but mostly magazines and the books I thought (Curami's and Rastrelli's) do not fit your clues (Giorgio Nada and Legenda).
Reading this thread I can think of 'Il menù dei Motori', because they are all about Modena (il Pianeta Modena), but I just have few extracts of those publications...and I don't think I ever sent you scans of your books...