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

Marc Wiese wrote:

Most aircraft turbos have an exhaust AR of over 1.

Marc Wiese

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