blowing off in vac.
#8
Re: blowing off in vac.
the bov works off vacuum, it only makes sense that it would be open at idle when the vac pressure is highest in the intake mani. I get a whoosh too when i shift even if I am not making positive pressure.
I have a theory as to why, the turbo is still working, just not fast enough to make boost at low throttle positions, and when you close the throttle plate, it pressurizes the charge pipes just a lil and the vac in the intake mani makes the bov open releasing this little bit of pressure. Maybe I am all wrong but it would make sense to me. does anybody else smell what i'm stepping in?
I have a theory as to why, the turbo is still working, just not fast enough to make boost at low throttle positions, and when you close the throttle plate, it pressurizes the charge pipes just a lil and the vac in the intake mani makes the bov open releasing this little bit of pressure. Maybe I am all wrong but it would make sense to me. does anybody else smell what i'm stepping in?
#10
Re: blowing off in vac.
Well first off the bov opens when it see's vac.
your boost guage is probably hooked up to the intake manifold, therefore when the throttle plate closes there is vac and thats whats your guage is reading at the same time as your bov see's it and opens to release the boost from the charge pipes so that it does not try to push the turbine backwards.
your boost guage is probably hooked up to the intake manifold, therefore when the throttle plate closes there is vac and thats whats your guage is reading at the same time as your bov see's it and opens to release the boost from the charge pipes so that it does not try to push the turbine backwards.
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