I just went thru this on Saturday helping a fellow TDer install a vacuum block on a 91 Daytona T-1
The "vacuum ejector" as Chrysler calls it is just a vacuum "loop" with numerous outlets to controlled components.
On the Daytona it was loacted down by the turbo.
I am still trying to find out what the purpose of this is/was.
My best guess is that it was to save space and use less seperate vacuum line in the system.
We were unable to delete this section, although we did build a new one and ran the lines for the evap system directly off the TB
and eliminated it from the "ejector" setup.
I will be at my Son's house tomorrow.
If he did not throw out the old lines I can take a pic of the "vacuum ejector" setup for you.
The compressor relief valve(BOV
) in the airbox gets its vacuum/pressure source directly from the manifold on the backside where the main vacuum source to the brake booster is located.
is closed by pressure(boost) and opens from vacuum so when you are in boost and release the throttle vacuum opens the valve to relieve manifold pressure.