Return-Path: Received: from smtp018.mail.yahoo.com ([216.136.174.115] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with SMTP id 568237 for flyrotary@lancaironline.net; Wed, 15 Dec 2004 08:16:12 -0500 Received-SPF: none receiver=logan.com; client-ip=216.136.174.115; envelope-from=prvt_pilot@yahoo.com Received: from unknown (HELO stevehome) (prvt?pilot@24.136.229.34 with login) by smtp018.mail.yahoo.com with SMTP; 15 Dec 2004 13:15:41 -0000 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Injectors and fuel pump pressure Date: Wed, 15 Dec 2004 08:15:40 -0500 Message-ID: <006701c4e2a8$2d7f7f50$6b01a8c0@workgroup.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0068_01C4E27E.44A97750" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0068_01C4E27E.44A97750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Barry, Thanks. I didn't know that. One thing I forgot to mention though is that when I set the fuel pressure, it was with the engine off (static). The fuel pressure regulator is MAP referenced, and reduces the fuel pressure at low power, and boosts it up at high power (boost), in a 1:1 ratio. At idle, it's only running about 20 lbs now. Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Barry Gardner Sent: Tuesday, December 14, 2004 9:49 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Injectors and fuel pump pressure 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 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0068_01C4E27E.44A97750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Barry,

Thanks. I didn't know that. One thing I forgot to = mention=20 though is that when I set the fuel pressure, it was with the engine off=20 (static). The fuel pressure regulator is MAP referenced, and = reduces the=20 fuel pressure at low power, and boosts it up at high power (boost), in a = 1:1=20 ratio. At idle, it's only running about 20 lbs = now.

Steve=20 Brooks

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Barry=20 Gardner
Sent: Tuesday, December 14, 2004 9:49 = PM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: Injectors = and=20 fuel pump pressure

Did you guys know that the 2nd=20 generation turbo had some kind of electronic gizmo in its circuit = (help me out=20 here, Ed Anderson) that stepped down the voltage on the fuel pump at = idle? I=20 ran a voltmeter on my 87 Turbo's fuel pump for a while. I think at = idle it was=20 running about 9 volts and then it jumped up to about 11.7 or so at = WOT. So I=20 think you're on the right path, Steve. At least you're taking the same = route=20 the factory did with its 550 cc injectors.

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

Barry Gardner
Wheaton, = IL

Steve=20 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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