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Message: <blockquote data-quote="Thomas_W" data-source="post: 1426868" data-attributes="member: 9106">The hotside causes the turbo to spin, but the hotside doesnt produce boost.  The compressor on the cold side produces boost by compressing the air going through it, not by speeding it up.  If it just sped the air up, it would create lower pressure.   This is why the wastegate has to be sourced from preferably the compressor housing or alternatively a vacuum lone source off the intake manifold. the wastegate shouldnt modulate just by revving the car. It will stay closed until the cold side produces the proper amount of boost to overcome the wastegate spring pressure and open the wastegate, if it does, then something is amis bc boost isnt created until the vehicle is under some kind of load and free reving the vehicle isnt going to create any. Most BOV's arent adjustable except for spring replacement or spring trimming.  The only way to do this properly is to measure the vacuum your engine produces at idle and then install the spring that matches that vacuum. This ensures the BOV opens and closes properly.</blockquote>