I've got a .48 .60 t3 on my 240sx (ka24e) and I'm trying to up the boost.
Right now the boost controller is tightened down almost all the way and I'm only getting 11 lbs.
Is this the most I should expect out of it or do I have a boost leak?

 

your boost controller could be bad as well, when mine went out on my talon all i could get was the stock boost level or an endless boost level

 

Well, I think the boost controller is good.... but I'll check it.
For the flapper.. How do I tell if it's not sealing?

 

Insoct the area for cracks, Check for slop when the arm is connected to the flapper.

 

alright.. I'll give that a go.. I want 15 lbs!

When should I expect it to max out if it is working properly?

 

What kind of boost controller are you using?? If it is of the home depot type, having it screwed down all the way will give you stock wg settings, because it will not be bleeding any of the vac/boost signal off.

 

.. what do you mean bleeding any of the signal off?

It's kindof a home depot thing, but it's less ghetto and made to regulate air. just not for turbos. If it's tightened down all the way wouldn't it go to max boost because the wg won't be getting any signal?

 

Don't listen to this guy. A Home Depot Ball and Screw type (which is what 90% of HD MBC are!): Screwing the screw all the way down would increase the preload on the spring, thus increasing the pressure required to move the ball and allow pressure past it to flow onto the WG Port!

If there is no leaks and WG seams to be sealing, A heavier screw may be required in the MBC. I've played around with many springs, pre-loads and ball sizes with mine inorder to get the PSI, Spool Time and lack of spikes that I wanted!