vaccum lines routing for stock boost control

[TT383]

A friend of mine had his GN worked on, now it only see's about10-12lbs of boost. It doesn't matter how much he adjusts it. I noticed on the boost control vaccum lines, they just had a plain vaccum T and the rubber hose. Can he run a plain vaccum T? I thought it took a Y vaccum fitting(doesn't it have a check ball in one part of it?) Can someone please tell me or send me a pic on how this should be routed and the part#(if required) for the Y fitting?.

Thanks

 

[kenmosher]

He needs the stock "Y" with restrictor or you see the symptoms you described.

See:

http://www.gnttype.org/maint/quickref.html

for a picture...

 

[DRKSYD]

Thanks Jeff you described it much better than me. Part of being a mechanic huh? Ok now is this Y fitting available through auto parts stores or is a dealer item or would I need to find a TR/GN vendor for it?