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Hey Dexter,
What timing.
I have just finished up the first MBC+A setup for the 9000. Attached is a picture so you can see and maybe it will explain some timgs for you.
The problem that I have had with the 9000 is that each year seems to pose changes in something that made it difficult to make a kit that would work for many or all of the 9K model. The 2 features of a MBC+A is that it better deals with the boost overshoots inherant in all ball and spring style MBC's. The second isand effective way to alllow one to move your pressure tap downstream of the IC for better longer sustained boost at higher RPM's where otherwise you would see droop. For the NG900 and early 9-3's, this was achieved by make a pressure tap into a hose between the TB and the IAC. For the 9000, this could be done if you have the manual TB with a IAC. If you have a 9000 with the Motorized throttlebody, then this can't be used.
Being there have been many changes, I decided to get a kit out that would at least effectively deal with the boost overshoots and let the 9000 owner figure out what options they have for moving the pressure tap at a later time.
So this would by pass the stock BPC, the turbo hose would connect to the inlet and the WG hose would connect to the outlet. You could adjust the MBC to provide stokc boost pressure or you could raise it some as you wish. The +A will provide some support to deal with the overshoots so not to hit any fuel cuts.
For anyone who has seen the MBC+A for the NG900, the 9000 is reversed. The inlet is at the bottom due to the location of the hoses.
If you have the Manual TB, there are tow locations that can be sued for a pressure tap: 1), there is a blanking lug at the TB above the throttleplate that has been used. Once removed, you could tap in a brass barb for pressure. 2) you could take off the inlet hose off the TB that goes to the IAC, extend the hose just enough to insert a pressure tap there and connect it with a coupler(probably a 3/4" coupler ould work.
As for your other questions...There are bleed valves made by forge and Abbott that incorporate all three line. But they are bleed valves and not ball and spring style MBC's, so spool up will not be improved.
With the MBC+A, you can wither leave the intake return hose attached to the BPC and plug off the other two line with a short piece of vac hose or remove the BPC altogether and plug off the line back to the intake.
There are a lot of options and depending on your year car and what it has (i.e.-MTB, Non MTB, BPC on right or left side of car, style of BPC(inline or fanned barbs)) this could be an effective way to manage your boost goals in all temperatures.
Hope this helps.
posted by 208.235.174...
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