Dan Ruggirello wrote:

Hi folks,
I am making great progress on the Bushcaddy fuselage.  I seem to have the
rotary on my mind alot during the building process though.  Probably has
something to do with the great newsletter traffic ;-)  Lately, I have been
thinking alot about turbos, so I have a few questions.

1.  Has anyone thought out a method to control boost for a stock 2nd gen
turbo?  Looks like it is electronically controlled for stock?

2.  I will only require about 230HP from a 13B TII engine, so I suspect the
boost will be rather low.  (Any estimates what boost pressure to develop
230HP?) Would it be difficult to control the stock turbo this low (if it is
low)?

3.  Any ideas how to enable/disable the stock turbo for intermittent use?
(Take-off and high altitude cruise) Would a mechanical system be feasible?
Would a muffler be required?

4.  How is Greg Richter controlling boost for his Cozy (not sure the current
status of it)?  Is it controlled to 8 psi only by the full time TO4
turbine-compressor design?  I saw that he was using an HKS 12psi BOV in the
intake, but this appears to be for safety.

Dan Ruggirello

My guess is 8 psi on the boost for 230HP. Stock is 5 psi 205 HP with
a muffler. More without. The stock gate is controlled by a pneumatic servo
sensing the intake manifold pressure. It is possible to control 
the stock waste gate with a push pull control cable instead.

I don't plan to run a muffler as IMHO the turbo does a pretty good job.

Paul Lamar
 
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