Bulent Aliev wrote:

After Paul suggested the second pipe for the turbo waste gate, I opened my
newly rebuilt turbo. Together with an old machinist we decided that it is
very doable. Right now the waste gate is opening maybe only 3/16" or even
less. If an opening of about 2" diameter is made on the cover for a pipe,
the waste gate will open much more. The machinist said the cover plate is
forged steel and will weld very well.
The advantage as I see it, will be less stress on the turbo, comparing to
over speeding the turbo and dumping the access air out.
I have a lever on my quadrant just for the waste gate.

--
Bulent Aliev
Stretched CZ MK-IV W/Turbo Rotary
Ft Lauderdale, FL FXE
http://home.bellsouth.net/p/PWP-MyPlane

Bulent, make something like this more or less and you can open
the waste gate valves 90 degrees. That will allow a die grinder in
there to port the waste gate passages. This can be flame cut or laser
cut out of steel.

Paul Lamar

I was thinking about that, but I'm afraid the wall will become too thin. I
would rather open the gate to max, possible and let the gasses straight out.
Another advantage of this method would be that it is much cheaper to do,
unlike sending the turbo to have the wheels altered.
Here is a photo of my engine controls: Throttle, Cooling flap (blue) and
boost/waste gate (red).
Bulent

This part can have a 1/4 wall which is plenty. Think about it. Just after
this part you have a SS tube with an .065 wall or thinner. Wide open
waste gate with the gases coming straight out is the whole idea with this 
part. As it is now the waste gate hits the turbo rear cover. It is only
open about 20 or 30 degrees. So space the cover back with this part.
You can still add the separate tube for the waste gate gases
shown on the far side.

Paul Lamar
 
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