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Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 370035 for flyrotary@lancaironline.net; Wed, 18 Aug 2004 15:48:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040818194821.IPDB1721.imf16aec.mail.bellsouth.net@rd> for ; Wed, 18 Aug 2004 15:48:21 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: EM-2 MAP readings Date: Wed, 18 Aug 2004 14:48:30 -0500 Message-ID: <02ab01c4855c$569cab50$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02AC_01C48532.6DC6A350" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_02AC_01C48532.6DC6A350 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I've taken up enough of Tracy's time on the phone today, so I figured = I'd post this to the list, and he (or anyone else) can comment. =20 =20 As I mentioned, my MAP reading is only 27 on the ground, at full = throttle. I thought I had this isolated to the intake being too restrictive, but = Tracy suspects it's more a matter of the way the ports are positioned on the = TWM throttle body. He also mentioned that someone else (Al, maybe) had the = same issue, with lower than expected MAP readings when using the ports on = their TWM. Is anyone using the TWM TB ports, and seeing near 30 MAP? I sure = wish I had documented this little tidbit of info from the previous version. =20 I tried to check the EM-2 MAP reading today, but as usual, came away = with more questions than answers. Tracy said that the EM-2 would read MAP = using it's internal sensor, when the EC-2 was off, along with displaying NOP = on the RPM display. When the EC-2 is on, he said it should read the MAP = from the EC-2 sensor. There's only one cal, so you can only calibrate one, = or the other, but you really only use one of the sensors, so this isn't a problem. =20 =20 So, I turned on the EM-2, and read 30.0. According to my altimeter, = that's probably not quite right, but very close. Next, I turned on the EC-2. = Now, the MAP shows 20.4. At this point, I got excited, figuring the MAP just needed to be calibrated. I looked at the cals and decided to correct = for the "sensor offset". This will only be meaningful if you're familiar = with the later EM-2 programming. Once I corrected the sensor offset, the = EC-2 on reading was now 30.0, and the EC-2 off reading was 39.6. =20 =20 To test the range of the cal, I hooked up a vacuum pump to the EC-2 MAP hose, and pulled about 10 inches of vacuum. Unfortunately, the EM-2 = still reads 30.0. Nothing I could do with the vacuum line would change the = MAP reading, so I have to conclude that the EM-2 won't read this correctly, = even with the EC-2 on, unless the engine is running. I did try both = controller hoses BTW. =20 =20 When I realized that wasn't working, I set the sensor offset back to = where it was originally, and figured I'll just have to put a vacuum gauge in = the MAP line the next time I run the engine. Unfortunately, that probably = won't be before Sat. =20 =20 Cheers, Rusty (one step from ordering another SlingShot kit) =20 =20 ------=_NextPart_000_02AC_01C48532.6DC6A350 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I've taken up = enough of=20 Tracy's time on the phone today, so I figured I'd post this to the list, = and he=20 (or anyone else) can comment.

As I mentioned, = my MAP=20 reading is only 27 on the ground, at full throttle. I thought I = had this=20 isolated to the intake being too restrictive, but Tracy suspects = it's more=20 a matter of the way the ports are positioned on the TWM throttle=20 body. He also mentioned that someone else (Al, maybe) had the = same=20 issue, with lower than expected MAP readings when using the ports on = their=20 TWM. Is anyone using the TWM TB ports, and seeing near = 30=20 MAP? I sure wish I had documented this little tidbit of info = from the=20 previous version.

I tried to = check the EM-2=20 MAP reading today, but as usual, came away with more questions than=20 answers. Tracy said that the EM-2 would read MAP using it's = internal=20 sensor, when the EC-2 was off, along with displaying NOP on the RPM=20 display. When the EC-2 is on, he said it should read the MAP from = the EC-2=20 sensor. There's only one cal, so you can only calibrate one, or = the other,=20 but you really only use one of the sensors, so this isn't a=20 problem.

So, I turned on = the EM-2,=20 and read 30.0. According to my altimeter, that's probably not = quite right,=20 but very close. Next, I turned on the EC-2. Now, the MAP = shows=20 20.4. At this point, I got excited, figuring the MAP just = needed to=20 be calibrated. I looked at the cals and decided to correct for the = "sensor=20 offset". This will only be meaningful if you're familiar with the = later=20 EM-2 programming. Once I corrected the sensor offset, the EC-2 on = reading=20 was now 30.0, and the EC-2 off reading was 39.6. =

To test the = range of the=20 cal, I hooked up a vacuum pump to the EC-2 MAP hose, and pulled about 10 = inches=20 of vacuum. Unfortunately, the EM-2 still reads 30.0. Nothing = I could=20 do with the vacuum line would change the MAP reading, so I have to = conclude that=20 the EM-2 won't read this correctly, even with the EC-2 on, unless the = engine is=20 running. I did try both controller hoses=20 BTW.

When I realized = that wasn't=20 working, I set the sensor offset back to where it was originally, and = figured=20 I'll just have to put a vacuum gauge in the MAP line the next time I run = the=20 engine. Unfortunately, that probably won't be before Sat. =20

Cheers,

Rusty (one step = from=20 ordering another SlingShot kit)

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