Paul,
Welcome back!
A few days ago in one of the turbo related discussions someone

mentioned

using

the "auto boost controller" to manage the boost level. Do you know if

this

is a

Mazda system or some after market controller?
Thanks
Dean Head

It is a stock Mazda thing. A pneumatic servo is connected to
the intake manifold and opens the waste gate when the pressure is
x amount above atmospheric. Usually 5 psi. The problem with that is it

is

not what you want at high altitude so there should be a way
of over riding it manually. Disconnecting it from the
intake manifold will work.  At high altitude, say when the atmospheric
pressure is only 10 psi instead of 15 psi (sea level), you need
10 psi of boost to get the same HP you get at sea level.

It is the thing in the lower right corner.

Paul Lamar

Paul,
Thanks for the info. I was not sure how that componet functioned in the

stock

setup. Now your comment about the air bleed is clear to me. On the series

four

turbo exhaust manifold there is another actuator. Does it work in syncrony

with

this one? It looked to be controlled by another source.
Thanks
Dean

Forgot to answer the second question. That is a valve servo that
closed off part of the early 2nd gen (87-88) turbo for faster spool up.
A real design disaster as the manifold and the turbo cracked
everywhere. I suspect it was closed at low RPM full throttle.
Not sure how it was controlled.

Paul Lamar

Paul,
Thanks
Dean Head

 
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