X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1414451 for flyrotary@lancaironline.net; Fri, 22 Sep 2006 01:13:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m27.mx.aol.com (mail_out_v38_r7.6.) id q.c58.1c91a4d (63000) for ; Fri, 22 Sep 2006 01:13:05 -0400 (EDT) From: WRJJRS@aol.com Message-ID: Date: Fri, 22 Sep 2006 01:13:05 EDT Subject: Re: [FlyRotary] Re: Fuel Pressure Regulator Vacuum or Boost?? To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1158901985" X-Mailer: 9.0 SE for Windows sub 5032 X-Spam-Flag: NO -------------------------------1158901985 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/21/2006 8:20:30 PM Pacific Standard Time, rijakits@cwpanama.net writes: b) If not shouldn't the fuel pressure stay constant (absolute), so that the electronic control takes care of mixture with a fixed fuel pressure and adjusts injector pulse according to manifold pressure? Thomas, You have answered your own question, with a question! Yes most systems would like to see a "absolute" fuel pressure. So if your manifold referenced regulator is hooked up and working what should happen when your MP goes "down" ie produces a vacuum at idle? The fuel pressure must also go down. I don't have Tracy's EMS (yet?) but I believe it has a mapp sensor built in doesn't it? The mapp sensor helps to compensate for WOT at low RPM and changes the pulse width to richen the mix when you are trying to accelerate. Old fasioned carberators used accelerator pumps and "power valves" to do the same thing. (usually not as well) Bill Jepson -------------------------------1158901985 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 9/21/2006 8:20:30 PM Pacific Standard Time,=20 rijakits@cwpanama.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
b) If not shouldn't the fuel pressure stay constan= t=20 (absolute), so that the electronic control takes care of mixture with a fi= xed=20 fuel pressure and adjusts injector pulse according to manifold=20 pressure?
Thomas,
 You have answered your own question, with a question! Yes most=20 systems would like to see a "absolute" fuel pressure. So if your manifold=20 referenced regulator is hooked up and working what should happen when your M= P=20 goes "down" ie produces a vacuum at idle? The fuel pressure must also go dow= n. I=20 don't have Tracy's EMS (yet?) but I believe it has a mapp sensor built in=20 doesn't it? The mapp sensor helps to compensate for WOT at low RPM and chang= es=20 the pulse width to richen the mix when you are trying to accelerate. Old=20 fasioned carberators used accelerator pumps and "power valves" to do the sam= e=20 thing. (usually not as well)
Bill Jepson
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