Lilladan:
The 225 horse Foden was well behind Volvos 230 from the 1950s ! , what form of Intercooler has this truck ? how many Radiators ? you cannot have Supercharged AND turbo charged , two different things in fact really , in City and Giuilds exams at any rate !
If I’ve read it right it’s a two stroke Foden ?.In which case just like a Detroit engine it’s not technically supercharged.It’s just a blower to do the job of the missing induction stroke at least when scavenging is marginal such as when starting.While not knowing anything about a turbocharged intercooled two stroke Foden you’ll certainly find that set up available on Detroit engines.
As for supercharged and turbocharged you certainly can have both in those applications where needed. 