> Can a new (larger) turbine be install in the stock turbo??  Or..
 > Could you use a turbo from an engine with the same HP and altitude
 > requirements...like a turbo from a TIO-360 as a replacement??
 > I wish I could use my low mileage stock turbo.
 > Ernesto
 >

When I talked with the turbonetics guys at Oshkosh they told me that they
could upgrade the stock turbo "to the next size up" while keeping the stock
turbine housing.  Perhaps this means adding a larger compressor and just
"clipping" the turbine blades.  They said it would cost about $700.  I have
sent an e-mail requesting more specifics, but no response.

They seemed to feel that overspeeding wouldn't really be a problem because
the top-end seems to be self limited by internal friction and increased hp
going to the compressor.  Instead, they felt that back pressure would just
build up enough to limit the output of the engine.  However, they may not
have been taking into account that resistance supplied by the compressor will
be reduced in thinner air.

They also mentioned cutting out the divider channel in the manifold as "the
first thing he would do" to limit back pressure and overspeeding.  In the
attached pic, although it is a little hard to see, note that the waste gate
has two separate holes which are about the same size as the single waste gate
hole in the pre '89 models.   Basically, this is 2 wastegates - one for each
exhaust channel.  By cutting out (or putting a hole in) the divider between
the two exhausts I can effectively double the size of the wastegate in this
'91.  I am thinking that I would make a hole close the engine to avoid
negatively "tuning" the exhaust.  Any input?

Dave Leonard

Cutting that divider would cause cracks in your turbine housing
Dave. Don't do it. That is the problem with the 86 to 89 manifold and
turbo set up.

Paul Lamar
 
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