As to trim, AR and so fourth I have no idea.
Chrissi, do we know what Greg is using?
Paul Lamar

Greg is using a TO-4e with P trim. We are going to go through the graphs

and charts in a couple of weeks and try to nail it down to something more
optimal if it exists.

...Chrissi

Ernesto Sanchez wrote:

>From Paul Yaw site for his 250 hp aircraft turbo motor:(
http://personal.riverusers.com/~yawpower/ac13bt.html ) "The turbo (From
Turbonetics) is a Garrett TO4E, 50 trim compressor, P trim exhaust, with a
modified 1.3 AR ratio housing. The turbine wheel is made of inconel. The
center section is water cooled. The turbo feeds the engine through a small
intercooler made by Spearco".

I'm not an expert but from my research the TO4E 50 compressor is the best
all around (250-300 hp).  At 10,000 feet, you'll hit its sweet spot.  Now
figuring out the exhaust AR is going to take some experimentation.  Too
small, too much boost at low rpm.  Too big, the boost moves up too high on
the rpm band. Paul Yaw's number seems high but he's the expert.  I was
thinking of starting at .96 AR.  Chrissi, what's Greg's exhaust AR?

Ernesto

 
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