ive got a related question.
at idle (warm) my boost gauge shows the normal ~20 vac (psi gauge). on cold start when rpm is around 1100 it used to show less vac, like 15 or something, till the revs dropped, but now it sits on 20vac at cold start. not sure which of these is normal.
the factory gauge shows similar figures.
if i rev it at cold start, the gauge moves up accordingly. all other readings while warm etc seem fine.
cold start and idle are spot on. no idle hunting, etc.
which one of these readings do you guys get at cold start? 20 vac, as when warm? or higher. eg 15 vac?