> 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.


Hi Paul,

   As you suspect, the size and shape of the waste gate is inadequate
for non-muffled applications that do not want a lot of boost.  In the
past, I have had to increase the waste gate hole diameter, smoothe the
entrance to the hole and add a tube from the waste gate flap area to "y"
into the turbine outlet to get control of the boost.  Hitachi did
nothing wrong - the system works correctly with mufflers.

Jim Mederer

Thanks Jim.

Paul Lamar ...No rotor no motor.

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