Paul,
By the springs in the wastegate diaphragm, I would say there is at least 5
psi. no hard data, but I thing high strung diesel systems and race turbo's
are even more.
Larry


That is a great idea. I have some of those 2nd gen waste gate servos up at
the hangar.
All you need do is pull on the waste gate flap with a small spring scale
and then calculate  the area of the flap.

I just have a TO4 here in the office.
--
Paul Lamar ...No rotor no motor.

Larry,
What is 5 PSI in bar, is 2 bar 5 psi?
George (down under)

1bar (barometric pressure) = 14.5psi.  bar is actually a useful unit
of pressure for certain things.

5psi is 0.34bar.


Matt-

Larry,
Tests at Mistral of Turbo charger backpressure, show an average of 2 bar, so
that must be 29 psi.
George ( down under).

I don't believe it. Something wrong. That would be about 40 psi boost
Or 55 psi absolute 110 inches of Hg. A two rotor would be putting out 800 HP or more
and I don't think Mistral is interested in building engines like that.

If it were intake manifold pressure it would be somewhat more believable at 2 bar or
15 psi boost.  Able Ibarra gets 800 HP on alcohol, 18 psi boost and NOS.

You have a decimal point off there somewhere.

Paul Lamar ...No rotor no motor.

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