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Message: <blockquote data-quote="Lanter" data-source="post: 1426869" data-attributes="member: 20552">The turbine (hot side) doesn't make boost, quite the opposite as it takes exhaust gas as a certain temperature and speed and decelerates it.  The mechanism for decelerating this flow (exhaust gases) removed energy from the exhaust gases in the form of heat release and work.  This work is the rotational energy that goes into the shaft that connects the turbine side to the compressor side.  This rotational work is what drives the compressor and makes boost.  There is no turbine on the cold side, it is a compressor wheel.  Think of it as a turbine takes gases and decelerates or expands them, releasing heat and energy.  This energy goes to the compressor which takes air and compresses it adding density and heat while doing so.  This increase in density is where the power increase is as more air equals needing more fuel which equals more power.It's impossible, unless the compressor wheel or turbine wheel is slipping on the shaft so that some of the work is lost, for the turbine to do work yet the compressor fail to make boost.  So my gut says you have a massive boost leak somewhere, you really need to do a boost leak test to eliminate any possible leaks.As for BOV setting, you'll want to choose the spring that roughly equals the engine vacuum your car produces at idle.  This is just an example but since engine vacuum at idle is typically measured in inches of mercury I'll use it.  So if your car make 19 inHG vacuum, or -19 inHg of pressure you can convert that to psi (unit of spring pressure for most BOVs) by roughly cutting it in half or multiplying by 0.491154.  So if we take the 19 inHG you'll want to use a roughly 10 psi spring, BOV springs are color coded and for TIAL the 10psi spring is unpainted or natural bare metal in color. If by adjustable you mean your BOV uses some sort of bolt to raise and lower spring pressure, similar to a fuel pressure regulator you'll want to apply 19 inHg vacuum to the BOV and adjust the stiffness until the valve is closed, but just closed.</blockquote>