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i have been enjoying my plain MBC setup and contemplating the benefits of the +A modification on my 99 9-3 auto( with j/r filter), airbox mod, airflow mods etc and sport exhaust planned. i understand the basic premise of the + A and am interested of doing that as well. i am a bit sketchy on then mechanical limitations of the plain mbc.
my understanding is that the boost spikes caused by the mbc are caused by lag in the ball valve/spring setup of the device causing delay in the activating the WGA causing "overboost" and resultant fuel cuts.
-why is this more of an issue in colder weather?
- where is the boost pressure sensor located?
With the +A setup while the WGA is being "primed" through the APR leg does not the outlet side of the MBC feel this pressure as well ( yes there is a vent on the MBC outlet but if there is pressure from the flow through the apr to the wga there will be equal pressure at the mbc outlet trough th y connection as the system is "open "in both directions). -
-would'nt this back pressure then require more pressure from the turbo side to activate flow through the mbc thereby minimizing the benefit of having a "primed" wga?
- would having a one way valve between the apr leg and the mbc oulet side (ie at the t or y junction to prevent flow from apr to mbc oultet) eliminate the back pressure on the MBC? i assume the apr leg would then have to have a vent to deactivate the wga.
any validity to the above musings or have i missed some key piont somewhere? thanks john
posted by 208.31.4...
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