Return-Path: Received: from scaup.mail.pas.earthlink.net ([207.217.120.49] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3196461 for flyrotary@lancaironline.net; Wed, 28 Apr 2004 23:12:28 -0400 Received: from user-33qt5ms.dialup.mindspring.com ([199.174.150.220] helo=Carol) by scaup.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 1BJ1yK-00056J-00 for flyrotary@lancaironline.net; Wed, 28 Apr 2004 20:12:25 -0700 Message-ID: <008b01c42d97$c7fe2610$0000a398@Carol> From: "sqpilot@earthlink" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: ECU wiring Date: Wed, 28 Apr 2004 22:12:17 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0088_01C42D6D.DE4F2330" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2739.300 This is a multi-part message in MIME format. ------=_NextPart_000_0088_01C42D6D.DE4F2330 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 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 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0088_01C42D6D.DE4F2330 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks for your reply, Tracy.  Your = statement "that=20 is normal automotive practice", I assume means that I am OK with = constant power=20 to the injectors.  From what I understand of the MicroTech unit, it = also=20 can receive it's power from the injector wiring.  Also, it has a = circuit so=20 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=20 ridden by simply not connecting the pink wire from the coils, which goes = into=20 the ECU and gives it instruction to send power to the fuel pumps.  = Thanks=20 again for clearing this up for me, I can sleep better now.  = Congrats on=20 getting your website back online as well.  sincerely,  Paul=20 Conner
----- Original Message -----
From:=20 Tracy = Crook
Sent: Wednesday, April 28, 2004 = 10:02=20 PM
Subject: [FlyRotary] Re: ECU = wiring

That is normal automotive practice Paul.   The EC2 must = not be=20 wired that way due to the spike clamping diodes on it which recover = the=20 inductive energy in the injectors at cutoff time (to reduce power=20 consumption).  It also has the effect of powering the EC2 through = the=20 injectors if the power is left on the injectors.
 
Tracy  (recovering from panic mode after getting website = back on the=20 air)
 
----- Original Message -----
From:=20 sqpilot@earthlink
Sent: Wednesday, April 28, = 2004 10:25=20 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] ECU = wiring
 
Hi, fellow rotary enthusiasts.  My 13b is = running=20 pretty well with my Micro
Tech ECU.  I keep thinking that = even=20 though it's running OK, I might have
something wired incorrectly, = or that=20 could be improved upon. I know that
most of you are using Tracy's = ECU,=20 but since they both accomplish the same
task, I thought I could = ask a=20 couple of questions to compare my system=20 to
Tracy's.
      The wiring = schematic shows=20 a red wire going from the positive side of
the battery, through a = 30 amp=20 fuse, and to one side of the injectors. That
would put power to = the=20 injectors at all times, even if the ignition switch
is in the OFF = position.  I understand that the injectors, however will = not
fire=20 until the ECU sends a ground signal to the other wire on the = injector.
Is=20 this common practice?  Does Tracy's system work in a similar=20 manner?
      The schematic shows the = red wires=20 that go to the 4 Bosch coils goes
through the ignition switch = first. That=20 made sense to me.
     I have a small = terminal strip=20 on the cold side of the firewall that
gets it's power straight = from the=20 ignition switch, so I could easily swap
the "constantly hot" wire = that=20 goes from the positive side of my battery to
the injectors, = disconnect it=20 and attach it to the "ignition on" power strip
so that the = injectors only=20 get power with the ignition switch in the=20 ON
position.
      Not sure if this = really=20 matters....I wasn't so sure it would be good
to have constant = power going=20 to the injectors from the battery.  However,
that's how the = heavy=20 starter wire is....Direct power to the starter from the
positive = side of=20 the battery.
      I sure would = appreciate any=20 and all opinions on this.  It does run OK
as is....I'm just=20 wondering if there are any safety concerns, etc about
leaving = power to=20 one side of the injectors even when the plane is not=20 being
used.
      Thanks for = everyone's=20 attempt in clearing this up for me.  Paul
Conner, 13b = powered SQ2000=20 in Mobile, AL



>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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