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 4900887 for flyrotary@lancaironline.net; Wed, 09 Mar 2011 13:00:30 -0500 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@UWYO.EDU Received: from ponyexpress-ht1.uwyo.edu (ponyexpress-ht1.uwyo.edu [10.84.60.208]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id p29HxobU027511 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Wed, 9 Mar 2011 10:59:53 -0700 (MST) (envelope-from SBoese@UWYO.EDU) Received: from ponyexpress-mb5.uwyo.edu ([fe80::9813:248c:2d68:a28b]) by ponyexpress-ht1 ([10.84.60.208]) with mapi; Wed, 9 Mar 2011 10:59:52 -0700 From: "Steven W. Boese" To: Rotary motors in aircraft Date: Wed, 9 Mar 2011 10:59:52 -0700 Subject: RE: [FlyRotary] Re: more staging and tuning Thread-Topic: [FlyRotary] Re: more staging and tuning Thread-Index: AcvefTX+1QxLX/V8S7aMeLcCGcV9iwAA02/A 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_E1AA3B1AF41D8049B1E3FBD5E2256260088739700Bponyexpressmb_" MIME-Version: 1.0 --_000_E1AA3B1AF41D8049B1E3FBD5E2256260088739700Bponyexpressmb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ed, Those perturbations you see are the result of engaging the pulse width addi= tion hardware and the readjustment of modes 3 and 2 along with a momentary = manual mixture change that was unnecessary. I should have labeled three re= gions on the plot with the area you are referring to as a readjustment peri= od. That plot was a quick attempt at showing the effect of the pulse width addi= tion in a single session. The adjustments were probably not the best since= it was cold, windy, and our latest snowstorm was just getting started. Si= nce this data was collected in my back yard, I try to keep the sessions sho= rt for the neighbor's benefit. So far, though, the horses just across the= alley are the only neighbors that have shown any interest. I suspect that adding the injector lag time is a large part of what adjusti= ng the MAP table is doing when using either of the two tuning methods descr= ibed previously. The second method may be easier just because the step in = the table at staging has already been eliminated. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Ed Anderson Sent: Wednesday, March 09, 2011 10:12 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: more staging and tuning Fascinating, Steve I presume the perturbation we see in the right side of left plot (Tuning Pl= ot1.jpg) as you decrease engine rpm (and I see a tweak of the manual mixtu= re control -- perhaps to keep the engine from dying?) - the O2 sensor bobbi= ng between rich and lean. I do not see that pertubation on the right plot = - is this (bobbing between rich and lean) due to the controller causing t= he injectors to actually cut off (not open) due to the 1.2 msec delay not b= eing compensated for??? If one had the controller map math, it might be possible to add the "1.2mse= c" of fuel missing by increasing the MAP value in each bin??? However, I = guess (even if possible) it would be easier to compensate by using your met= hod 1 or 2. Good work, really appreciate you sharing it with us Ed --_000_E1AA3B1AF41D8049B1E3FBD5E2256260088739700Bponyexpressmb_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ed,

 

Those p= erturbations you see are the result of engaging the pulse width addition ha= rdware and the readjustment of modes 3 and 2 along with a momentary manual = mixture change that was unnecessary.  I should have labeled three regi= ons on the plot with the area you are referring to as a readjustment period= .

 

=

That plot was a quick attempt at showing the effect= of the pulse width addition in a single session.  The adjustments wer= e probably not the best since it was cold, windy, and our latest snowstorm = was just getting started.  Since this data was collected in my back ya= rd, I try to keep the sessions short for the neighbor’s benefit. = ; So far, though,  the horses just across the alley are the only neigh= bors that have shown any interest.

 

I suspect that add= ing the injector lag time is a large part of what adjusting the MAP table i= s doing when using either of the two tuning methods described previously.&n= bsp; The second method may be easier just because the step in the table at = staging has already been eliminated. 

 

Steve

 

 

From: Rotary motors in aircraft [mailto:f= lyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent:= Wednesday, March 09, 2011 10:12 AM
To: Rotary motors in aircraft=
Subject: [FlyRotary] Re: more staging and tuning

 

Fascinating, Steve

=  

I presume the perturbati= on we see in the right side of left plot (Tuning Plot1.jpg)  as you de= crease engine rpm (and I see a tweak of the manual mixture control -- perha= ps to keep the engine from dying?) - the O2 sensor bobbing between rich and= lean.  I do not see that pertubation on the right plot -  i= s this (bobbing between rich and lean)  due to the controller causing = the injectors to actually cut off (not open) due to the 1.2 msec delay not = being compensated for???

If one had the contr= oller map math, it might be possible to add the "1.2msec" of= fuel missing by increasing the MAP value in each bin???  However= ,  I guess (even if possible) it would be easier to compensate by usin= g your method 1 or 2.

=  

Good work, really apprec= iate you sharing it with us

 

Ed

 

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