I have decided to use the Megasquirt
system to control the turbo compound engine on the dyno
motor. Tracy's computer is too hard to tune
for the dyno loads. Also the price is right
on the Megasquirt. I know how to program the
6800 processors in assembly language so I can
make changes in the code for aircraft use or turbo
compound use.
Anybody using Megasquirt on here with their
rotary engine?
--------------------------------------------
This is a gif of the overall Megasquirt system.
There is a pile of software running on notebook
computers for setting up the tables and monitoring
the EFI system in real time. It will even do it
through Blue Tooth wireless.
The relay box makes it
much easier to wire as you don't have to solder
a whole bunch of small wires to the back of a 36 pin
DB connector.
The down side is it requires a throttle position
sensor which I can adapt to my custom made
throttle body.
Paul Lamar ...No rotor no motor.nline tool for gearbox calculation.
Paul,
If you dig deap enough into the MegaSquirt web site I think you
will find people that have 13Bs running with it. It has been a few
months but that is what I remember.
MegaSquirt is high on my list of todos. I am in a non-spending
mode until my taxes come back from the accountant. I don't know what
my tax liability is.
A friend is converting a carburetor 2L VW bus to MegaSquirt. I
haven't seen him recently, so I don't know how it is coming.
I was think that I would build a rack and pinion along the top of
the slide throttle for a position indicator. Either cut a rack into
the Teflon or trim the Teflon down and add a metal rack a bit thinner
to the top of the slide. A multi-turn variable resistor on a pinion
--
Blake C. Lewis
Another trick for a roll your own linear position indicator
is wrap a small AC cable around the 1/4 inch shaft of a
ten turn pot and use a screen door type spring on the
other end of the cable to keep tension on it.
Also linear pots are available off the shelf.
http://www.omega.com/toc_asp/subsectionSC.asp?subsection=J&book=Pressure&all=1-
Paul Lamar ...No rotor no motor.
Hi Paul;
For the throttle position sensor on your slide throttle -
think linear sliding POT as used on old analog radio tuners.
Hoping to have Megasquirt running on the test stand shortly.
(think I said that last time too;)
At this point, there is really no need to modify the core code.
Managing your turbo may be different.
One thing to note with the DB-37 cable from MS to the relay board
is that this is not a standard straight thru DB-37 cable. Some of the
lines (Fuel pump, injectors) will be carrying some real current
requiring heavier guage wiring. So you end up soldering your
wires on to the backs of the DB-37 pins anyway...although
the wiring to the relay board is easier.
Most of the relay board cases are open top.
If you are planning on running fuel and spark, do your reading first
before building any of the boards or you will end having to make
several stages of mods.
There is also a MS'NS (Megasquirt and spark) daughter board by "Error"
to control ignition. Version 1 requires some minor mods, version2
might be out.
Relay board is nice for wiring.
With 4 older low impedance injectors on the rotary, you may want the
flyback board it is borderline. (although it takes up valuable
space in the case for the "Error's MS'NS board"- In hindsight,
I would probably just add ballast resistors...
Stimulator board is pretty much a must.
I recommend ordering one of the kits with cases and all
from one of the vendors -
got mine promptly from:
http://www.glensgarage.com/
There is a Megasquirt forum under:
www.rx7club.com
www.msefi.com
www.megasquirt.info
www.bgsoflex.com
lots of sites/vendors popping up.
If you have any questions - let me know.
Cheers
Cary
Thanks for all the tips Cary. I have 1000,s of parts left
over from an old biz so I will start with the bare
PC boards. I am thinking of DIY. What do you think of them?
The stimulator board sounds great. You can check everything out
with out running the engine. I'll be using stock Turbo Two
injectors.
Paul Lamar ...No rotor no motor.
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