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Thanks for your reply, Tracy. Your statement "that
is normal automotive practice", I assume means that I am OK with constant power
to the injectors. From what I understand of the MicroTech unit, it also
can receive it's power from the injector wiring. Also, it has a circuit so
that if the coils stop firing, it turns off the fuel pump relay and fuel
pumps. If spark returns to the injectors, the fuel pump comes back
online. I don't know if this is beneficial or not. It can be over
ridden by simply not connecting the pink wire from the coils, which goes into
the ECU and gives it instruction to send power to the fuel pumps. Thanks
again for clearing this up for me, I can sleep better now. Congrats on
getting your website back online as well. sincerely, Paul
Conner
----- Original Message -----
Sent: Wednesday, April 28, 2004 10:02
PM
Subject: [FlyRotary] Re: ECU wiring
That is normal automotive practice Paul. The EC2 must not be
wired that way due to the spike clamping diodes on it which recover the
inductive energy in the injectors at cutoff time (to reduce power
consumption). It also has the effect of powering the EC2 through the
injectors if the power is left on the injectors.
Tracy (recovering from panic mode after getting website back on the
air)
----- Original Message -----
From:
sqpilot@earthlink
Sent: Wednesday, April 28, 2004 10:25
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] ECU wiring
Hi, fellow rotary enthusiasts. My 13b is running
pretty well with my Micro
Tech ECU. I keep thinking that even
though it's running OK, I might have
something wired incorrectly, or that
could be improved upon. I know that
most of you are using Tracy's ECU,
but since they both accomplish the same
task, I thought I could ask a
couple of questions to compare my system
to
Tracy's.
The wiring schematic shows
a red wire going from the positive side of
the battery, through a 30 amp
fuse, and to one side of the injectors. That
would put power to the
injectors at all times, even if the ignition switch
is in the OFF
position. I understand that the injectors, however will not
fire
until the ECU sends a ground signal to the other wire on the injector.
Is
this common practice? Does Tracy's system work in a similar
manner?
The schematic shows the red wires
that go to the 4 Bosch coils goes
through the ignition switch first. That
made sense to me.
I have a small terminal strip
on the cold side of the firewall that
gets it's power straight from the
ignition switch, so I could easily swap
the "constantly hot" wire that
goes from the positive side of my battery to
the injectors, disconnect it
and attach it to the "ignition on" power strip
so that the injectors only
get power with the ignition switch in the
ON
position.
Not sure if this really
matters....I wasn't so sure it would be good
to have constant power going
to the injectors from the battery. However,
that's how the heavy
starter wire is....Direct power to the starter from the
positive side of
the battery.
I sure would appreciate any
and all opinions on this. It does run OK
as is....I'm just
wondering if there are any safety concerns, etc about
leaving power to
one side of the injectors even when the plane is not
being
used.
Thanks for everyone's
attempt in clearing this up for me. Paul
Conner, 13b powered SQ2000
in Mobile, AL
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