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)