ahmedsalem89
Member +
thank you so much man, I'm still new to the whole turbo thing, and I still don't get the theory and behaviour of these BOVs it's just more complicated than I expectedthat is exactly how it should behave. its fine
some questions about blow off valves
- Thread starter ahmedsalem89
- Start date
corofin12345
Member +
on boost, the inlet manifold is pressurised.. so the pressurised air comes out the vacuum line to BOV and keeps the BOV shut (on boost)
once you let off the throttle the inlet manifold goes from pressurised to vacuum after the throttle body flap is closed so the vacuum line to BOV is now vacuuming and the excess compressed air left in the intercooler escapes through the BOV...
once you let off the throttle the inlet manifold goes from pressurised to vacuum after the throttle body flap is closed so the vacuum line to BOV is now vacuuming and the excess compressed air left in the intercooler escapes through the BOV...
ahmedsalem89
Member +
thanks guys for the help, so If I'm getting this right,
before Boost:
when the boost gauge is showing range from 0.8 vacuum to zero then the BOV is not holding the air yet, that's why when the boost gauge shows between 0.2 vacuum and zero (just before starting to make boost) the BOV is still not holding air but the turbo has already started creating some kind of air pressure (air flow) in the pipe and that's why air escapes from the BOV.
after Boost:
the pressurized air out of the vacuum line holds the BOV shut so no matter what amount of pressure the turbo creates it won't ever open until there is no pressure in the inlet manifold (foot of the throttle).
before Boost:
when the boost gauge is showing range from 0.8 vacuum to zero then the BOV is not holding the air yet, that's why when the boost gauge shows between 0.2 vacuum and zero (just before starting to make boost) the BOV is still not holding air but the turbo has already started creating some kind of air pressure (air flow) in the pipe and that's why air escapes from the BOV.
after Boost:
the pressurized air out of the vacuum line holds the BOV shut so no matter what amount of pressure the turbo creates it won't ever open until there is no pressure in the inlet manifold (foot of the throttle).