You are right. The purpose of the BOV (or BPV) is to provide a path for the presurized column of air to go when you close the throttle (turbo is spinning when there is little or no vacuum so it is creating pressure before the throttle body). When you lift your foot off the gas, the throttle body closes but the turbo is still pushing air at it. The BOV allows this pressurized air to be re-routed back into the intake of the turbo (or upstream of the turbo anyway) and allows the turbine to spin down at a reasonable rate (instead of slamming to a stop).
Blow off valve hook up?
Just picked up a turbo coupe that has a BOV on it. Its been attached to the side of the intercooler(pipe welded on) and the line runs to the vacuum block on the firewall. I read somewhere that the line was supposed to go to the intake before the throttle body. It seems to be functioning but is this a correct spot to hook it up or should i change it? And just for the sake of knowing the info, why?
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