Nae bhai it's just like A series engine I tell you a secret 
may you already know(just joking)
In toyota "T" stands for factory turbo , "Z" stands for factory supercharger , "F" for a fuel economy engine , "E" for efi, "G" for a performance engine. These are most commonly known
Now first one or two alphabets represent series example 1zzfe here zz represent series its 1.8cc while "f" tells that it is made for economy and "e" tells it's efi
No bhai 4zzfe is 1.3 and 3zzfe is 1.6
