X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA02.emeryville.ca.mail.comcast.net ([76.96.30.24] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3585955 for flyrotary@lancaironline.net; Sat, 18 Apr 2009 23:22:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.24; envelope-from=wschertz@comcast.net Received: from OMTA09.emeryville.ca.mail.comcast.net ([76.96.30.20]) by QMTA02.emeryville.ca.mail.comcast.net with comcast id hC5S1b0050S2fkCA2FMm46; Sun, 19 Apr 2009 03:21:46 +0000 Received: from WschertzPC ([71.57.77.95]) by OMTA09.emeryville.ca.mail.comcast.net with comcast id hFMg1b00C23NHuF8VFMl8t; Sun, 19 Apr 2009 03:21:46 +0000 Message-ID: <60A92CB4DD83428F81AE19BE4E4AC8AB@WschertzPC> From: "Bill Schertz" To: Subject: Tuning the EC-2 Date: Sat, 18 Apr 2009 22:21:39 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C9C074.0B8EB150" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C9C074.0B8EB150 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable All, I have been working on getting my EC-2 tuned to get smooth engine = operation over the entire range.=20 I used Mode 1 to do the initial tuning, and got it to run reasonably = well with some roughness at various points. I then used the auto tune feature on the ground, running the engine up = to higher and higher RPM and letting it tune in the settings. At that point I thought I was pretty much there, with one exception. When idling (600 rpm prop, 1710 engine) and increasing the throttle = slowly (with a vernier throttle, rotating the knob), the engine would = accelerate pretty smoothly all the way up, however, If I Pushed the = throttle in quickly, the engine would hesitate, buck, jump up and down = in MP until suddenly it would scream to life at 3000 engine rpm and then = be smooth. I finally figured out what the issue was. When auto tuning (or manual = tuning) on the ground, the MAP table values at low RPM (Low manifold = pressure) are selected from the low rpm table (values 0-63). As I slowly = advanced the throttle, the EM-2 brought each table value into good = order, but at ~2400 rpm it switches to the high table value and keeps = going on adjusting the table values. When advancing the throttle rapidly, the Manifold pressure rises = quickly, the RPM is still low, so the EC-2 selects values that were = never adjusted in the previous process, the engine ran rich (very), = bucked and snorted until the RPM gets to the high table, and then = smoothed out. I finally figured this out by using the Track Mode on the EM-2 and = watching the bin # as the throttle was advanced using the vernier. It = would increase 2,3,4,5,6, 72, 73...etc. When the throttle was advanced quickly, the bin numbers went = 2,3,4,5,6,14,12,15,13, 72, etc. By then turning the engine off, and = manually adjusting the values in bins 8-14 to the same value as 73, the = engine is much smoother during acceleration. Bill Schertz KIS Cruiser #4045 N343BS ------=_NextPart_000_0008_01C9C074.0B8EB150 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

All,

I have been working on getting my = EC-2 tuned=20 to get smooth engine operation over the entire range.

I used Mode 1 to do the initial tuning, = and got it=20 to run reasonably well with some roughness at various = points.

I then used the auto tune feature on = the ground,=20 running the engine up to higher and higher RPM and letting it tune in = the=20 settings.

At that point I thought I was pretty = much there,=20 with one exception.

When idling (600 rpm prop, 1710 engine) = and=20 increasing the throttle slowly (with a vernier throttle, rotating the = knob), the=20 engine would accelerate pretty smoothly all the way up, however, If I = Pushed the=20 throttle in quickly, the engine would hesitate, buck, jump up and down = in MP=20 until suddenly it would scream to life at 3000 engine rpm and then be=20 smooth.

I finally figured out what the issue = was. When auto=20 tuning (or manual tuning) on the ground, the MAP table values at low RPM = (Low=20 manifold pressure) are selected from the low rpm table (values 0-63). As = I=20 slowly advanced the throttle, the EM-2 brought each table value into = good order,=20 but at ~2400 rpm it switches to the high table value and keeps going on=20 adjusting the table values.

When advancing the throttle rapidly, = the Manifold=20 pressure rises quickly, the RPM is still low, so the EC-2 selects values = that=20 were never adjusted in the previous process, the engine ran rich (very), = bucked=20 and snorted until the RPM gets to the high table, and then smoothed=20 out.

I finally figured this out by using the = Track Mode=20 on the EM-2 and watching the bin # as the throttle was advanced using = the=20 vernier. It would increase 2,3,4,5,6, 72, 73...etc.

When the throttle was advanced quickly, = the bin=20 numbers went 2,3,4,5,6,14,12,15,13, 72, etc. By then turning the = engine=20 off, and manually adjusting the values in bins 8-14 to the same value as = 73, the=20 engine is much smoother during acceleration.

Bill Schertz
KIS Cruiser=20 #4045
N343BS

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