Subject: Megasquirt
From: Rotary Engine
Date: 5/21/2011, 8:21 AM
To: AAA Put this in the To box
CC: Tracy Crook <tcrook@rotaryaviation.com>, Tracy Crook gmail <rwstracy@gmail.com>


Is anyone using Megasquirt to control fuel and ignition?

Any words of wisdom?

I am getting close to looking for a fuel injection ignition solution and
the
555 is not there yet.  I cannot use the CAS unit and will need a trigger
wheel based system.

Paul, what injectors fit the holders that you are currently providing?
You
do mention the RX8 yellow injectors are there others that fit?

I was looking for a defined path for setting up a MS system with decent
backup but it looks like a lot of research is in the cards.

Joe Berki
Limo EZ
13b P Port
Thanks for any help.

RX8 yellow injectors fit the best. Seimans will work.
Sorry I don't have time to test and develop the 555 system further.

Paul Lamar

Paul,

Are you going to pursue optimization for setting up Tracy's EC2? Also I
believe you found a way to make it work on a P Port by averaging MAP via the
oil injector ports.  Will that go on the test stand?

I have some programing experience but it has been a while.  I need to look
at the Megasquirt code to see what sensors I need and what stuff can be done
away with.  Not too sure on backup for fuel with the slide throttle.  The
Ford EDIS option with Megasquirt looks good for ignition backup assuming you
loose the MSand not power.

Thanks

Joe Berki

First thing is I am going to try to get it to work.
Mike reported some unresolved problems.
Assuming I can do that the next step is a bit of
reverse engineering using a data acq system I have.
I need to better understand what it does and when
it does it as Tracy does not supply the source code.

I am rather upset so many people have so much trouble
tuning it. It should not be all that much trouble.
IMHO it sorely needs a USB interface like the Megasquirt.

Tracy rational for not providing PC support was the small
size of the RV4 cockpit. With USB 64 gig thumb drives
that no longer applies. You could store the map on a thumb
drive. Take the TD out of the unit and take it
home and re map  it in your PC.

You could save maps on your hard disk and have half a dozen
thumb drives with different maps. People could share
maps on the Internet with similar airplanes and props.

Paul Lamar

The current version of the EC2/3 code is worlds away from the version you have if the last update was on the date you last sent.  I got the impression that you were having some kind of problem but I never heard what it was so it's hard to comment.

If a builder wants to tinker with code and hardware design, you can't do better than the megasquirt.

Tracy

How has it improved? Do you have something written up
you can send us on the improvements?

old messages
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On Thu, May 5, 2011 at 11:12 PM,
HI Paul,

I never got any info on why he installed those in addition to his engine monitor. The only stuff I have of any significance is his general correspondence trying to fix the issue of his EC2 dumping its memory.  I'll forward all that one of these days.

-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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Yes, but you may remember that he was late the day....

His problem was an intermittent memory dump of the computer B memory.  Totally erased out of the blue for no good reason.  Computer A always remained intact and he was always able to copy A=>B and replace the memory, but it was disconcerting to him.  It happened several times and he was growing quite frustrated trying to find the cause.  He eventually,  found a loose IC chip in the EC2 and re-seated it, and that seemed to fix the problem as he went another 10 hours of so without a recurrence.

Then, it happened again when he was comming up to come see us at Borrego.  He was late because he was debating weather or not to take off.  He reset the memory and did some run up and it seemed to hold so he finally decided to come meet us.

I think he flew the plane very little after that day at Borrego because he was at his wit's end trying to figure out what was causing computer B to dump its memory.  He had sent the unit back to Tracy and everything checked out OK.

The things I can think of to check would be vibration isolation and solenoid/coil decay fields. (make sure the diodes are installed)  I had a terrible problem with my ELT being triggered.  On 2 different occasions I had to make trips to my plane late at night to answer to the CAP who had tracked down my ELT signal.  I finally tracked my problem down to my master contactor.  When I would turn off the master the decay spike would occasionally trigger the ELT even though the ELT was not even connected to the electrical system and located well away from the contactor!!!   Sounds like the kind of thing that might be able to cause the EC2 to dump some of its non-volatile memory.  Installing a diode (per Aeroelectric Connection) solved my problem.

I figure I owe you at least a couple of days of hard labor.  I can help re-install wings, engine, EC2, test flying, transition training for you in my airplane, whatever you want.  Let me know when you need help and I will find time in my schedule.  But it might always take me a couple of weeks to schedule a day off.

-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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I have since installed vibration isolation but it has not run yet.

Paul Lamar
-- 
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