Why connect MBC to BOV line?

[Siberian]

Why does everyone seem to T the MBC into the BOV line... instead of right after the turbo?

Doesn't that BOV line connect AFTER the throttle plate? And if so, doesn't it confuse things when the plate slams shut and the line suddenly shows no pressure?

Why not connect it right after the turbo outlet, where it would always have an accurate reading?

 

[KPWSerpiente]

Because it is not always accurate. The pressure in the j pipe, or compressor housing, or lower intercooler piping is not going to be the same as the pressure in the intake manifold (some pressure will be lost). What does a manual BOOST controller control? Boost. What is boost? Intake manifold pressure...this is where you want to be getting your reading for your gauge and many people will tell you this is the best place to tap into for your boost controller.
Now really it isn't going to make a difference as long as you have your guage is tapped into the manifold.

-T

 

[kpt4321]

Right on.

You want to regulate manifold pressure. That's the point.