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Yeah. I've been off the list for about 9 months and missed your posts. Before I
left, I wasn't that interested in turbocharging. While I was "on sabbatical" the
notion developed that a turbocharger is the most effective muffler available for
a rotary - with the collateral benefit of boost :o) I would simplify (the
mechanical aspects) by using independent levers for throttle and wastegate, but
aside from that I am right there with you. Rusty tells us that there is -some-
boost is there even with the wastegate wide open but that is manageable. The
arrangement of using boost last - after WOT is reached - will minimize
intercooling requirements. I like your pop-off valve that goes at an absolute
MAP and not some over pressure.
We seem to be on the same page .... Jim S.
Marvin Kaye wrote:
Jim Sower <canarder@frontiernet.net> wrote:
>>>I would have a manual internal waste gate. The waste gate would
be normally open (dumping all exhaust past the turbo). On
takeoff, I would run WOT (say 29"), no boost. I could close the
waste gate a little and get 33" for example for a hot day or
short field. As I climb out at WOT, I gradually close the waste
gate to maintain 30" MAP. ...<snip>...<<<
I have outlined essentially this same system here several times during the
last few years, as it is the simplest and probably the least complicated way
(read less plumbing and parts) to get the job done. My intention is to setup
the throttle lever so 50% travel gives me WOT at the throttle body. As I
further advance the throttle lever the wastegate begins to close and brings
the turbo online. With the throttle lever wide open the wastegate will be
fully closed. The popoff on the intake manifold is referenced to MAP and not
boost, and set to blow off at my intended 34" MAP redline... this way the
overboost protection is unaffected by ambient pressure. Just thought I'd
share this once again as it's a hot topic revisited.
<marv>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T
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