Paul,

Looking through the archives, I've been unable to see your
recommendation for a turbo size. I know that you've played with trying
to get the stock 89-91 turbo to work at the thinner air up high but
that's still a work in progress. Greg Richter got a recommendation from
Garrett or Turbonetics (a dealer) for one of the TO4 series. Do you
remember what it was? Trim style? A/R ratio? I seem to recall it was
greater than 1.0.

What are the Cozy Girrrls using?

Any suggestions?

Barry Gardner
Wheaton, IL

I'll have to search backwards for that. Perhaps later today. The TO4 will
certainly work but it is a lot easier to just use the stock 89-91 water cooled turbine
with built in waste gate and put a TO4 compressor on it like Dave Leonard did.
This slows the stock turbine allowing it to live. The TO4 requires custom
everything and an external waste gate. That adds a lot of weight, cost and time.

Paul Lamar ...No rotor no motor.

Barry,
Go to the Canard Aviation Forum  (at:
http://www.canardaviationforum.dmt.net/index.php?)  and search the
recent postings by John Slade.  He has listed the details for the new
system that Turbonetics designed for his installation.  It is to date
untested in flight, but, installation photos are there or on John's web
site.

Aubrey

I was rather surprised the TO4 was so light weight. I went and got mine
and weighed it. Sure enough it only weighed 16 pounds.
The stock turbo weighs 21 pounds with the waste gate.
If you throw in the 3.5 pounds for the external waste gate
you get a total of 19.5 pounds still lighter than stock.
I stand corrected on that. Apparently the cast iron on the stock
is much thicker even taking into consideration the weight of
the built in waste gate. Either that or Garrett is using cast steel
or some other high temperature alloy. Interesting.

The remaining unknown is the life of the light weight SS
exhaust manifold at 8 pounds instead of ten for the
stock cast iron unit.


Paul Lamar ...No rotor no motor.

Paul,
Yes, the stock manifolds are thick!  I have 13B and 20B manifolds that
I've acquired for experimentation.  The flanges on them are about a half
inch thick and most of the manifold body feels like it is about 3/8 inch
thick.   Interestingly, both manifolds have a thinner region that feels
to be about 1/4 inch thick and on both manifolds there is a crack
running the length of the thinner section.

Aubrey

Yes I have acquired a few cracked ones. The 87 was a mass of cracks.

Too bad as with one chamfer operation I think Mazda could have avoided
cracks in the 89 to 91 all together.