I think he wants to know what the minimum he can set the Blitz controller at is.
No advantage in going below 0.5bar really. It only affects fuel consumption when you put your foot down. When cruising, it'll be the same with a 0.5 or 0.9bar setting because you aren't on boost. Maybe that was the real question???
Ive done it before, 2sec job on a Cosworth as they have top mounted turbos.
Its called "mum and garage" mode
Tho on a car that runs with a MAP sensor rather than MAF you could just remove the boost pipes if you want, it wont run any different!
I drove a good 5 miles once before I put my foot down and no boost.
It was THEN I remembered my boost pipes were in the kitchen sink in some soapy water, lol.