X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 12 Jun 2007 21:52:37 -0400 Message-ID: X-Original-Return-Path: Received: from mx3.pshift.com ([216.57.116.8] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2099097 for lml@lancaironline.net; Tue, 12 Jun 2007 20:05:22 -0400 Received-SPF: none receiver=logan.com; client-ip=216.57.116.8; envelope-from=colyncase@earthlink.net Received: from ccaselt2 (unverified [216.57.118.64]) by mx3.pshift.com (Vircom SMTPRS 4.4.568.30) with SMTP id for ; Tue, 12 Jun 2007 20:04:37 -0400 Received-SPF: none (mx3.pshift.com: domain of colyncase@earthlink.net does not designate any permitted senders) X-Modus-BlackList: 216.57.118.64=OK;colyncase@earthlink.net=OK X-Modus-RBL: 216.57.118.64=Excluded X-Modus-Trusted: 216.57.118.64=NO X-Modus-Audit: FALSE;0;0;0 X-Original-Message-ID: <0a4d01c7ad4e$72261060$0202a8c0@nvidia.com> From: "Colyn Case on earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Boost switch X-Original-Date: Tue, 12 Jun 2007 17:04:43 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0A4A_01C7AD13.C59A0DE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0A4A_01C7AD13.C59A0DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Alan said, That is why it would need to be tested which should be pretty = simple in run-up, etc.=20 Alan, I agree with your LOGIC concerning how the system SHOULD work. However, I totally disagree with what you propose here for testing the = high boost on TO option. You would want to know that your idea works = through the range of fuel temp, rpm, deck angle, outside air pressure, = outside air temp, engine temp, variations in engine fuel pump mfg = tolerances, wear etc. That's a sizable testing proposition. Meanwhile, the few data points I have say that the system is sensitive = to input pressure. e.g. there have been conditions where my engine was = fine without boost but very unhappy with it. In this case the idle = mixture was out of adjustment but it still proves that the fuel is = correctly metered no matter what the input pressure. Also, coupling even a tested policy to a computer would then require = extensive software testing also. ...at least if I were going to bet my = life on it. (I've spent too many late nights wondering why my program = "DID THAT" to take software testing lightly)=20 My solution is going to be to learn where the high boost button is and = be cocked to hit it if necessary. Colyn ------=_NextPart_000_0A4A_01C7AD13.C59A0DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Alan said, That is=20 why it would need to be tested which should be pretty simple in run-up,=20 etc.

Alan, I agree with your LOGIC = concerning how the=20 system SHOULD work.

However, I totally disagree with what = you propose=20 here for testing the high boost on TO option. You would want to know that your idea works through the range = of fuel=20 temp, rpm, deck angle, outside air pressure, outside air temp, engine = temp,=20 variations in engine fuel pump mfg tolerances, wear = etc. =20 That's a sizable testing proposition.

Meanwhile, the few data points I have = say that the=20 system is sensitive to input pressure. e.g. there have been=20 conditions where my engine was fine without boost but very unhappy with=20 it. In this case the idle mixture was out of adjustment but = it still=20 proves that the fuel is correctly metered no matter what the input=20 pressure.

Also, coupling even a tested policy to = a computer=20 would then require extensive software testing = also. ...at=20 least if I were going to bet my life on it. (I've spent too = many=20 late nights wondering why my program "DID THAT" to take software testing = lightly)

My solution is going to be to learn = where the high=20 boost button is and be cocked to hit it if necessary.

Colyn

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