I am very curious as to why when you unplug diverter and vent it but block the return line that goes back to the intake, the ecu has a code of low boost and mpg/power is reduced.

how does a vented diverter valve such as the forge w/spacer change this?

 

umm which side are you unplugging? You have to realize that the diverter valve is a closed loop system basically. The MAF/MAP sensors have accounted for all the air that is in the system. By unplugging one end you need to follow that hose and see where it connects to I am imaging you will realize it runs into the intake manifold creating a SERIOUS vacuum leak. If you are curious on how to install a blow off valve or something similar let us know. We can help point you in the right direction, but why in the world were you unplugging the valve in the first place??

 

A blow off valve is vacuum operated..... Releases the pressure when the throttle plate is closed. Which is AFTER boost.

What your doing is venting during BOOST..... which you do NOT want to do.

The forge setup vents only after you let off the gas pedal, usually indicating a shift. Its stronger and more durable that stock. Blow off valves have the ability to prevent compressor stall, but you have to start off in vacuum after every shift. The stock set up maintains positive pressure helping to spool faster in low boost applications.

Its been awhile since i dabbled in performance. But unless you upgrade the turbo..... the stock setup will do you just fine. That stock turbo doesn't handle too much more over stock boost.