Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 814981 for flyrotary@lancaironline.net; Mon, 21 Mar 2005 22:18:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=sqpilot@bellsouth.net Received: from paul52u7f5qyav ([209.214.45.156]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with SMTP id <20050322031748.NXPA1995.imf16aec.mail.bellsouth.net@paul52u7f5qyav> for ; Mon, 21 Mar 2005 22:17:48 -0500 Message-ID: <024d01c52e8d$b7b11770$5d734ed8@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" Subject: water temp sender connections Date: Mon, 21 Mar 2005 21:17:44 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_024A_01C52E5B.6C6AFE20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_024A_01C52E5B.6C6AFE20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I may have stumbled upon something that probably making it difficult for = me to tune my MicroTech ECU. The ECU takes into consideration = information from the O2 sensor, water temp and air temp to make = adjustments to the ignition timing and fuel mixture settings. I hooked = my water temp sender to two units....both my voice annunciating engine = monitor and the MicroTech ECU. While I was running the engine today, I = scrolled to a page on the MicroTech ECU handheld programmer that I have = not viewed before. This page provides both engine rpm's and water = temperature. The engine rpm's agreed exactly with my engine monitor. = The water temps, however were WAY off. The engine monitor said the = water temp was 180 degrees F and the ECU said the water temps were -15 = degrees C. Prior to the engine temps warming up, my engine monitor said = 140 degrees F, and the ECU said -24 degrees C. On various map pages, = the cold start enrichment is set to slowly start leaning the mixture = after 50 degrees C. That would put my REAL temps probably around 350 = degrees F. Not gonna happen. My question is....has anyone else connected more than one monitor = to a single water temp sensor? (I have the stock Mazda sensor located in = the water pump housing). I will also check the MicroTech manual again to = see if there is any place to calibrate the water temp sensor. (I know I = had to calibrate the throttle position sensor initially for idle setup). = Is it possible that one unit would have a correct reading and another = connected to the same sending unit would be so far off? Different wire = sizes making a difference? My next step will be to disconnect the engine monitor wire from = the water temp sending unit, and see if the ECU water temps are more in = line with what they should be. Just wondering if anyone else has = connected more than one instrument to a single sending unit. Thanks in = advance for all replies. Paul Conner ------=_NextPart_000_024A_01C52E5B.6C6AFE20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I may have stumbled upon something that = probably=20 making it difficult for me to tune my MicroTech ECU. The ECU takes = into=20 consideration information from the O2 sensor, water temp and air temp to = make=20 adjustments to the ignition timing and fuel mixture settings. I = hooked my=20 water temp sender to two units....both my voice annunciating engine = monitor and=20 the MicroTech ECU. While I was running the engine today, I = scrolled to a=20 page on the MicroTech ECU handheld programmer that I have not viewed=20 before. This page provides both engine rpm's and water = temperature. =20 The engine rpm's agreed exactly with my engine monitor. The water = temps,=20 however were WAY off. The engine monitor said the water temp was = 180=20 degrees F and the ECU said the water temps were -15 degrees C. = Prior to=20 the engine temps warming up, my engine monitor said 140 degrees F, and = the ECU=20 said -24 degrees C. On various map pages, the cold start = enrichment is set=20 to slowly start leaning the mixture after 50 degrees C. That would = put my=20 REAL temps probably around 350 degrees F. Not gonna = happen.

My = question=20 is....has anyone else connected more than one monitor to a single water = temp=20 sensor? (I have the stock Mazda sensor located in the water pump = housing). I=20 will also check the MicroTech manual again to see if there is any place = to=20 calibrate the water temp sensor. (I know I had to calibrate the throttle = position sensor initially for idle setup). Is it possible that one = unit=20 would have a correct reading and another connected to the same sending = unit=20 would be so far off? Different wire sizes making a = difference?

My next = step will be=20 to disconnect the engine monitor wire from the water temp sending unit, = and see=20 if the ECU water temps are more in line with what they should be. = Just=20 wondering if anyone else has connected more than one instrument to a = single=20 sending unit. Thanks in advance for all replies. Paul=20 Conner

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