Missing Boost

luigi90210

i have always been told this as well, with a BOV you want to keep it closed until you let off the throttle which would release all the pressurised air and prevent compressor surge

with a BPV you can have slightly open at idle or completely closed because you are recirculating after the MAF so either way, you are taking in the same amount of air since its been accounted for via MAF

also there is no such thing as a recirculated blow off valve since a blow off valve, blows off the pressurised air into the atmosphere while a bypass valve, allows the compressed air to bypass the turbo/supercharger and is recirculated in the system, since internally they are the same, the set up ultimately determines what the valve will function as(IE remove the recirc hose from the BPV and you now have a BOV and vise versa)

if im wrong about anything though, anyone please feel free to correct me but afiak bov and bpv are the same internally, just depends on how it is set up