X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTPS id 4901581 for flyrotary@lancaironline.net; Thu, 10 Mar 2011 03:14:12 -0500 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht2.uwyo.edu (ponyexpress-ht2.uwyo.edu [10.84.60.209]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id p2A8DZwP005755 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Thu, 10 Mar 2011 01:13:35 -0700 (MST) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-mb5.uwyo.edu ([fe80::9813:248c:2d68:a28b]) by ponyexpress-ht2 ([10.84.60.209]) with mapi; Thu, 10 Mar 2011 01:13:34 -0700 From: "Steven W. Boese" To: Rotary motors in aircraft Date: Thu, 10 Mar 2011 01:13:29 -0700 Subject: RE: [FlyRotary] Re: more staging and tuning Thread-Topic: [FlyRotary] Re: more staging and tuning Thread-Index: Acve8FeCooUQDv72QJC1z/ORRT30aAAACgRg Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_E1AA3B1AF41D8049B1E3FBD5E22562600887397178ponyexpressmb_" MIME-Version: 1.0 --_000_E1AA3B1AF41D8049B1E3FBD5E22562600887397178ponyexpressmb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, I apologize for the long posts. In my opinion, the short answer to your question is YES. The EC2 has the versatility to be tuned in a number of ways. It appears to= me, at least, that a significant part of the MCT corrections needed is the= result of injector lag time. There are at least two ways of dealing with = this. One is to experimentally determine this for each address in the table. Thi= s can be difficult since there are a lot of addresses and the corrections c= an be very different for adjacent addresses. In addition, some of this tun= ing can only be done in flight. Some users have more difficulty with this = than others. This may be because of the individual user or the individual = equipment configuration or both. At any rate, it seems to be a recurrent p= roblem. A second way to deal with injector lag is by including it in the calculatio= n of the injector pulse width. Doing so removes much of the MCT adjustment= s that are needed throughout the table and also removes the discontinuities= . This calculation is not difficult as demonstrated by the effectiveness o= f the hardware addition that I made which has no intelligence. Either method requires adjustments with modes 2,3 and, in some cases, 6. T= he only difference in using the second method is that the entire table is n= early correct after these initial two or three adjustments. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Al Gietzen Sent: Wednesday, March 09, 2011 11:56 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: more staging and tuning I haven't as yet studied through all the long posting on this subject; but = the uppermost (possibly dumb) question in my mind is, "Doesn't tuning the m= ixture correction table (MCT) to a given air/fuel mixture (read O2 sensor o= utput) take care of this injector lag time issue?" Al --_000_E1AA3B1AF41D8049B1E3FBD5E22562600887397178ponyexpressmb_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al,

I apologize for the long posts.

In my o= pinion, the short answer to your question is YES.

The= EC2 has the versatility to be tuned in a number of ways. It appears = to me, at least, that a significant part of the MCT corrections needed is t= he result of injector lag time. There are at least two ways of dealin= g with this.

&nb= sp;

One is to experimentally determ= ine this for each address in the table. This can be difficult since t= here are a lot of addresses and the corrections can be very different for a= djacent addresses. In addition, some of this tuning can only be done = in flight. Some users have more difficulty with this than others.&nbs= p; This may be because of the individual user or the individual equipment c= onfiguration or both. At any rate, it seems to be a recurrent problem= .

=

A second way to deal with injector lag is by includ= ing it in the calculation of the injector pulse width. Doing so remov= es much of the MCT adjustments that are needed throughout the table and als= o removes the discontinuities. This calculation is not difficult as d= emonstrated by the effectiveness of the hardware addition that I made which= has no intelligence.

<= o:p>

Either method requires a= djustments with modes 2,3 and, in some cases, 6. The only difference = in using the second method is that the entire table is nearly correct after= these initial two or three adjustments.

Steve

&nbs= p;

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietze= n
Sent: Wednesday, March 09, 2011 11:56 PM
To: Rotary m= otors in aircraft
Subject: [FlyRotary] Re: more staging and tunin= g

I haven’t as yet studied through all the long posting on th= is subject; but the uppermost (possibly dumb) question in my mind is, ̶= 0;Doesn’t tuning the mixture correction table (MCT) to a given air/fu= el mixture (read O2 sensor output) take care of this injector lag time issu= e?”

= Al

= --_000_E1AA3B1AF41D8049B1E3FBD5E22562600887397178ponyexpressmb_--