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Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 606308 for flyrotary@lancaironline.net; Thu, 13 Jan 2005 15:21:13 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050113202013.DDWX2378.imf23aec.mail.bellsouth.net@rd> for ; Thu, 13 Jan 2005 15:20:13 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: RE: [FlyRotary] Re: I got the power ! Date: Thu, 13 Jan 2005 14:20:27 -0600 Message-ID: <000501c4f9ad$523db250$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C4F97B.07A34250" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal In-Reply-To: <003c01c4f9a8$53a34f10$362dd6d1@paul52u7f5qyav> This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C4F97B.07A34250 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable If I recall correctly, the air/fuel mixture number was somewhere around 13... Make any sense?=20 =20 Yep, sure does. The theoretical ideal air fuel ratio (AFR) is 14.7, but that doesn't mean much to us. Any number lower than that is richer, = and of course higher numbers are leaner. Max power mixture is richer than = 14.7, and I'd suspect it might be close to your 13, but I'd also bet that it depends on lots of other things as well. During lean cruise, you will likely see numbers way up in the teens. =20 =20 My old FD had a Power FC computer, and a wideband O2 sensor. I had it = tuned to around 11 AFR for full throttle, full boost, around 14-15 for normal cruise, and I could even see the max of 20 on very light throttle = cruise. 11 AFR is pretty rich, and is needed to avoid detonation with the = turbos, but it shouldn't be needed for a NA engine. Bottom line is that you'll = have to do some testing to finish setting it up. =20 =20 Rusty =20 ------=_NextPart_000_0006_01C4F97B.07A34250 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

If I recall correctly, the
air/fuel mixture number = was=20 somewhere around 13... Make any sense?

Yep, = sure does. =20 The theoretical ideal air fuel ratio (AFR) is 14.7, but that doesn't = mean much=20 to us. Any number lower than that is richer, and of = course=20 higher numbers are leaner. Max power mixture is richer = than=20 14.7, and I'd suspect it might be close to your 13, but I'd also bet = that it=20 depends on lots of other things as well. During lean cruise, = you=20 will likely see numbers way up in the = teens.

My old = FD had a Power FC=20 computer, and a wideband O2 sensor. I had it tuned to around 11 = AFR for=20 full throttle, full boost, around 14-15 for normal cruise, and I could = even see=20 the max of 20 on very light throttle cruise. 11 AFR is = pretty rich,=20 and is needed to avoid detonation with the turbos, but it shouldn't be = needed=20 for a NA engine. Bottom line is that you'll have to do some = testing to=20 finish setting it up.

Rusty

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