Dave Leonard,

     Will you please publish the exact specs on your turbo, for us less
     bright
     guys to copy? I want to go into a turbo shop and tell the assistent:
     "Give
     me a turbo with these specs, please."

     Erik.



We have been through this discussion quite extensively several times.
Please check the archives for further details.

Truth is that there is a wide range of turbos that would be acceptable.
Your choices of PSRU, desired boost, cruise altitude and space under the
cowl will all play a role in the turbo selection.  But many will work.

The overriding rule is "Make it big" and let it loaf.

In my installation, the only manifold that will fit is the stock
manifold, so I am limited to the stock turbine housing.  Given that
restriction, here is my solution:

Stage IV upgrade to the '91 turbine housing:
http://www.bnrturbos.com/2ndGen.htm

I then cut out the wastegate flapper all together, creating a fixed
exhaust bypass.  That still allows me to make all the power I want (45"
MAP at S/L) but reduces the back pressure on the engine and stress on
the turbo.  If you want more power, you will need to keep the wastegate
flapper.

An equivalent off-the-shelf TO4 would be cheaper, but the manifold then
becomes an issue.  Garrett made a bunch of cast iron manifolds if you
can find one (with and without external wastegate mounting).  I don not
recommend the SS manifolds that are so prevalent, unless you find a way
to support the weight of the turbo separately.

I will be giving a talk at the rotary roundup this year detailing the
options and my trial an tribulations.

--
David Leonard

Turbo Rotary RV-6 N4VY

Thank you, Dave. That link is exactly what I wanted.

Erik.




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