Return-Path: Received: from [65.54.169.63] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 568540 for flyrotary@lancaironline.net; Wed, 15 Dec 2004 11:17:30 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.63; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 15 Dec 2004 08:17:00 -0800 Message-ID: Received: from 65.54.98.102 by BAY3-DAV33.phx.gbl with DAV; Wed, 15 Dec 2004 16:16:20 +0000 X-Originating-IP: [65.54.98.102] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Injectors and fuel pump pressure Date: Wed, 15 Dec 2004 11:13:42 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00DA_01C4E297.228C5DE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0009.2900 Seal-Send-Time: Wed, 15 Dec 2004 11:13:42 -0500 X-OriginalArrivalTime: 15 Dec 2004 16:17:00.0660 (UTC) FILETIME=[81BF9B40:01C4E2C1] This is a multi-part message in MIME format. ------=_NextPart_000_00DA_01C4E297.228C5DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Don't get confused by all this. Mazda (and others) do this to reduce = electrical draw when not needed. On the RX-7, The pressure is ALWAYS = controlled by the FP regulator, not the pump. Some new cars are doing = it at the pump but not these. Tracy ----- Original Message -----=20 From: cardmarc@charter.net=20 To: Rotary motors in aircraft=20 Sent: Wednesday, December 15, 2004 8:13 AM Subject: [FlyRotary] Re: Injectors and fuel pump pressure Most 2nd and 3rd gen rx7's have a dual voltage feed to the fuel pumps. = Look at your wiring diagrams in your manuals. It is self evident. Marc Wiese >=20 > From: Barry Gardner = > > Date: 2004/12/15 Wed AM 02:48:55 GMT > To: "Rotary motors in aircraft" = > > Subject: [FlyRotary] Re: Injectors and fuel pump pressure >=20 >=20 Did you guys know that the 2nd generation turbo had some kind of = electronic gizmo in its circuit (help me out here, Ed Anderson) that = stepped down the voltage on the fuel pump at idle? I ran a voltmeter on = my 87 Turbo's fuel pump for a while. I think at idle it was running = about 9 volts and then it jumped up to about 11.7 or so at WOT. So I = think you're on the right path, Steve. At least you're taking the same = route the factory did with its 550 cc injectors. I used to know the fuel pressure readings that corresponded to these = different voltages but took my engine out of the car for modifications = about 18 months ago. If I find my records, I'll let you know. Barry Gardner Wheaton, IL Steve Brooks wrote: One nagging problem that I have is the engine running rich at low power levels. I've turned the fuel pressure regulator down to 30 lbs to get = it reasonably lean, but I still don't have enough adjustment. The higher = power levels have a pretty good mixture on the default tuning. Right now I'm running the stock 550cc injectors, but I'm considering changing the primary injectors to 440cc, to help the low end mixture, = and leave the secondaries at 550cc, so that I still get sufficient fuel flow with the turbo at higher power settings. My thinking is that the 440cc injectors would allow me turn the fuel pressure back up to 38 lbs. and hopefully still be able to tune the = lower end where only the primary injectors are supplying fuel. Does anyone have experience doing this, hopefully with a turbo, or just = have an opinion ? Steve Brooks Homepage: http://www.flyrotary.com/ Archive: = http://lancaironline.net/lists/flyrotary/List.html =20 =20 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_00DA_01C4E297.228C5DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Don't get confused by all this.  Mazda (and others) do this to = reduce=20 electrical draw when not needed.  On the RX-7, The pressure is = ALWAYS=20 controlled by the FP regulator, not the pump.  Some new cars are = doing it=20 at the pump but not these.
 
Tracy
 
----- Original Message -----
From: cardmarc@charter.net
To: Rotary motors in = aircraft
Sent: Wednesday, December 15, = 2004 8:13=20 AM
Subject: [FlyRotary] Re: = Injectors and=20 fuel pump pressure

Most 2nd and 3rd gen rx7's have a dual voltage feed to = the fuel=20 pumps. Look at your wiring diagrams in your manuals. It is self=20 evident.
Marc Wiese
>
> From: Barry Gardner <barrygardner@mindspring.com>
>=20 Date: 2004/12/15 Wed AM 02:48:55 GMT
> To: "Rotary motors in = aircraft"=20 <flyrotary@lancaironline.net>
>=20 Subject: [FlyRotary] Re: Injectors and fuel pump pressure
> =
>=20
Did you guys know that the 2nd generation turbo had some kind of=20 electronic gizmo in its circuit (help me out here, Ed Anderson) that = stepped=20 down the voltage on the fuel pump at idle? I ran a voltmeter on my 87 = Turbo's=20 fuel pump for a while. I think at idle it was running about 9 volts = and then=20 it jumped up to about 11.7 or so at WOT. So I think you're on the = right path,=20 Steve. At least you're taking the same route the factory did with its = 550 cc=20 injectors.

I used to know the fuel pressure readings that = corresponded=20 to these different voltages but took my engine out of the car for=20 modifications about 18 months ago. If I find my records, I'll let you=20 know.

Barry Gardner
Wheaton, IL

Steve Brooks = wrote:
One nagging problem that I have is the engine running rich at =
low power
levels.  I've turned the fuel pressure regulator down to 30 lbs to get =
it
reasonably lean, but I still don't have enough adjustment.  The higher =
power
levels have a pretty good mixture on the default tuning.

Right now I'm running the stock 550cc injectors, but I'm considering
changing the primary injectors to 440cc, to help the low end mixture, =
and
leave the secondaries at 550cc, so that I still get sufficient fuel flow
with the turbo at higher power settings.

My thinking is that the 440cc injectors would allow me turn the fuel
pressure back up to 38 lbs. and hopefully still be able to tune the =
lower
end where only the primary injectors are supplying fuel.

Does anyone have experience doing this, hopefully with a turbo, or just =
have
an opinion ?

Steve Brooks


  
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