Umm what?!
"Vacuum after it got spooled" ??? that makes no sense at all
and also there are some very over boosted 1L engines out there. It can and has been done.
if you mean vacuum from teh exhaust turbine "sucking" the exhaust out, then you are mistaken cause no turbo has near enough mass to keep spinning like that to "suck" anything out of an engine, and the compressor housing will never create a vacuum cause its blowing air INTO the engine which would be the opposite of vacuum.