I have been following the thermostat debate with great interest.  I have a
question for those who are advocating a thermostat.  Would you also keep the
e-shaft oil thermostat functioning as designed?

Mazdatrix sell pressure regulators for racing to bump up the oil pressure.
Is anyone using these or recommend them?

In other news, I have decided to use the stock waste-gate controller.   It is
light, simple, and sturdy.  It is a simple spring loaded diaphragm open to
ambient pressure.  This means that (as long as the waste-gate is of
sufficient size) it provides boost over ambient, not to an absolute pressure.

 I think it is about 5-6 psi. (12 mm Hg).  I would think that the turbo could
continue this modest differential boost up to any altitude I might want to go
without overspeeding...  I think.  Which brings me to my question:  Would the
turbine speed required to create 5 psi boost at sea level be the same as the
turbine speed required to create 5 psi boost at 20k?

My guess is no, a higher turbine rpm will be required.  In fact its probably
an inverse linear relationship with pressure.  Hmmm.  Does anyone happen to
know the numbers?  It would be fairly easy to shorten the spring and decrease
the boost a little.  What say you?

Dave Leonard

 
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