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Hey! Hey! All this time??. Let me tell
you, Rusty being "retired" is hard work!{:>) I just expended over
a week on the new radiator inlet ducts, only to decide the curve profile was not
what I wanted and the glass work was crappy. They would have worked, but
what I have now works fine, I just want to try to get closer to a optimum
set up - so back to the drawing boards and K&W.
After rereading K&W material on the streamline
duct and finally having it click as to what the one figure was portraying, my
understanding has considerably improved. I can now make an approximation
as to how much pressure recovery I lose in truncating the duct length to fix
under the cowl. So new duct molds in the process as we speak.
I am also continuing in my quest to learn how to
program a microchip which would be the thing needed (desirable) to implement
such a "smart" waste gate controller. Hey, I have gotten it to the point
that it actually blinks at me and displays Numbers representing the duty cycle
of the pulse train the chip can generate. So it would seem that with using
the chip's A/D converter tied into a barometric sensor in the intake to
drive the duty cycle of the pulse you could control a waste gate servo.
Hummm.
But, still fairly slow going - next step is to have
it display on an LCD screen. I know seems trivial to you computer types,
but getting this done in assembly language is a major step for me.
Well, would like to chat more, but time is short so
have to run {:>)
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Friday, June 04, 2004 9:02 AM
Subject: [FlyRotary] Re: Turbo boost
limits in the EC2
Yes, I tend to agree. Tracy - are you listening? Does this
make sense to you? Anyone else care to comment? I'd really like to get
something built into the EC2....soon. Regards, John
Like most everyone
else, I don't like the fuel cut idea. I still think something along the
lines of an ignition retard would be best, but I have to admit to never trying
that. What we'd have to figure out is how much to retard it, and will
this really work?
Naturally, I have to
mention that this should be considered a safety feature, and not something to
be relied on daily. I think the first priority should be to get an
effective means of control of the turbo boost, which I commend several of you
for trying to do.
Once we get an effective wastegate, a
normal pressure type controller will work fine, except that it will be a
differential device, rather than being referenced to absolute pressure.
Here is where Tracy could provide electronic wastegate control, just as it's
done in the FD. In the car, to raise the pressure above the normal
wastegate controller, they use a solenoid to create a "leak" in the
pressurized line to the wastegate controller. Since a solenoid is a
"digital" device (either open or closed), the CPU sends a square wave pulse to
control it. The duty cycle of the pulse determines the average open
time of the solenoid. Since Tracy is already sensing the MAP, he could
use that to provide a pulsed signal for a solenoid, that varies from 0-100%
duty cycle. This could also be done as a standalone unit I would
think. Maybe since Ed has all this time on his hands... :-)
Cheers,
Rusty (too deep for this early in the
morning)
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