Nobody to my knowledge has removed
the flapper valve AND greatly increased the area of
the by pass passage at the same time. Also nobody to
my knowledge has installed a turbo tachometer to know
precisely  what RPM the turbo is actually achieving.
If you don't know that you are just fooling around
in the dark.

Paul Lamar ...No rotor no motor.

Paul, I did exactly that, and even removed the flapper from
the housing. The turbo was still surging suddenly to 50" of MP.
Buly

---------------------------
Wow!!! That is impressive as all get out.

BTW Buly has a 13B Cosmo engine with really big ports.
Bigger even than the 3rd gen apparently.

Something else is going on here. Apparently that
stock waste gate is very very ineffective.
Perhaps because the waste gate holes are 90 degrees
to the flow. The flow has so much velocity and momentum it goes
right on by. It certainly does not seem to be relying
on pressure alone to spin the turbine.

I am surprised Hitachi messed up so bad on the design.
Can you send me the parts Buly? I'll pay shipping.

Jim, Could you help us out here? What do you think
is going on?

Paul Lamar ...No rotor no motor.

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