Rising rate fuel pressure regulator
Mark S. Riley
turbotuneusltd at triad.rr.com
Sat Mar 10 13:47:52 GMT 2001
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Most fmu's are not linear in fuel delivery and can cause significant =
fuel curve deviation, usually extremely rich. They are included in the =
blower, turbo kits as a cheap, effective way to keep the customer from =
calling and complaining that the engine blew up on the test drive. Corky =
Bell's Super FMU is more adjustable than about any of the others that I =
have seen from around the world. It usually takes more work to get an =
FMU to deliver an acceptable fuel curve than it does to dial in the =
correct curve with injectors large enough to do the job correctly. =
However, there are a lot of FMU's in use. And until the owners dyno and =
check the fuel air ratio they are happy, cause it doesn't blow up when =
they mash it. But they work for the people who don't have access to do =
it any different. Makes blower and turbo kits saleable where otherwise =
the libality issues would prevent their sale except to the select few. =
Pick your poison. later, Mark Riley
----- Original Message -----=20
From: Bob Wooten=20
To: diy_efi at diy-efi.org=20
Sent: Saturday, March 10, 2001 1:20 AM
Subject: RE: Rising rate fuel pressure regulator
I have been looking into a blower for my car & most of the mfg's =
suggest a FMU (Fuel Management Unit) when I asked specifically how it =
worked they said that it is a device that goes in the return line off of =
your fuel rail. as Manifold pressure goes up it restricts more. sounds =
to me like a Back Pressure regulator that has the sense line going =
somewhere other than the input side. most of them are adjustable & the =
better ones are apparently pretty linear. this might be an accurate way =
to do what you are trying to do. I talked with techs @ Paxton, ATI, & =
Vortech & they all have the "same" thing. there are a ton of them on =
the fox bodied rustangs here in Southern California & I guess they serve =
their purpose. I would be willing to be that a bunch of the turbo guys =
have them as well. =20
Bob Wooten
http://www.procharger.com , http://www.paxtonauto.com/ , =
http://www.vortechsuperchargers.com/welcome/
-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On =
Behalf Of Hugh
Sent: Friday, March 09, 2001 8:37 AM
To: diy_efi at diy-efi.org
Cc: Scott Flanagan
Subject: Rising rate fuel pressure regulator
Scott Flanagan mentioned he was trying to map out a rising rate fuel =
pressure regulator.
I am also looking for a rising rate regulator that reacts to turbo =
boost.
All the turbo fuel pressure regulators I have seen, raise fuel =
pressure at a rate equal to the amount of boost.=20
I would like to find a fuel pressure regulator that gives something =
like 2 : 1 to give around 75 / 90 psi at 20 psi boost.
The aim is to bypass the need to fit larger injectors when =
increasing the power output of the engine and also the standard =
injectors will allow the car to idle better.
I also want to fit a fuel pressure sensor linked into the ECU to =
keep an eye on fuel pressure.
Hugh=20
++44 1224 209 592 home
++44 7980 443 803 mobile
++44 1224 312 668 fax
hugh at sol.co.uk
=20
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<META http-equiv=3DContent-Type content=3D"text/html; =
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Most fmu's are not linear in fuel =
delivery and can=20
cause significant fuel curve deviation, usually extremely rich. They are =
included in the blower, turbo kits as a cheap, effective way to =
keep the=20
customer from calling and complaining that the engine blew up on =
the test=20
drive. Corky Bell's Super FMU is more adjustable than about any of the =
others=20
that I have seen from around the world. It usually takes more work to =
get an FMU=20
to deliver an acceptable fuel curve than it does to dial in =
the=20
correct curve with injectors large enough to do the job correctly. =
However,=20
there are a lot of FMU's in use. And until the owners dyno and check the =
fuel=20
air ratio they are happy, cause it doesn't blow up when they mash =
it. But=20
they work for the people who don't have access to do it any different. =
Makes=20
blower and turbo kits saleable where otherwise the libality issues would =
prevent=20
their sale except to the select few. Pick your poison. later, Mark=20
Riley</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dr71chevy at earthlink.net =
href=3D"mailto:r71chevy at earthlink.net">Bob=20
Wooten</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, March 10, 2001 =
1:20=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: Rising rate fuel =
pressure=20
regulator</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D370361406-10032001>I=20
have been looking into a blower for my car & most of the mfg's =
suggest a=20
FMU (Fuel Management Unit) when I asked specifically how it =
worked they=20
said that it is a device that goes in the return line off of your fuel =
rail. as Manifold pressure goes up it restricts more. =
sounds to me=20
like a Back Pressure regulator that has the sense line going somewhere =
other=20
than the input side. most of them are adjustable & the =
better ones=20
are apparently pretty linear. this might be an accurate way to =
do what=20
you are trying to do. I talked with techs @ Paxton, ATI, & =
Vortech=20
& they all have the "same" thing. there are a ton of them on =
the fox=20
bodied rustangs here in Southern California & I guess they serve =
their=20
purpose. I would be willing to be that a bunch of the turbo guys =
have=20
them as well. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D370361406-10032001></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D370361406-10032001>Bob=20
Wooten</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D370361406-10032001></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D370361406-10032001></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D370361406-10032001><A=20
href=3D"http://www.procharger.com">http://www.procharger.com</A> , <A=20
=
href=3D"http://www.paxtonauto.com/">http://www.paxtonauto.com/</A> ,=
<A=20
=
href=3D"http://www.vortechsuperchargers.com/welcome/">http://www.vortechs=
uperchargers.com/welcome/</A></SPAN></FONT></DIV>
<BLOCKQUOTE style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
owner-diy_efi at diy-efi.org=20
[mailto:owner-diy_efi at diy-efi.org]<B>On Behalf Of =
</B>Hugh<BR><B>Sent:</B>=20
Friday, March 09, 2001 8:37 AM<BR><B>To:</B>=20
diy_efi at diy-efi.org<BR><B>Cc:</B> Scott Flanagan<BR><B>Subject:</B> =
Rising=20
rate fuel pressure regulator<BR><BR></DIV></FONT>
<DIV><FONT face=3DVerdana size=3D2>Scott Flanagan mentioned he was =
trying to map=20
out a rising rate fuel pressure regulator.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>I am also looking for a rising =
rate regulator=20
that reacts to turbo boost.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>All the turbo fuel pressure =
regulators I have=20
seen, raise fuel pressure at a rate equal to the amount of =
boost.=20
</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>I would like to find a fuel =
pressure=20
regulator that gives something like 2 : 1 to give =
around 75 / 90=20
psi at 20 psi boost.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>The aim is to bypass the need to =
fit larger=20
injectors when increasing the power output of the engine and also =
the=20
standard injectors will allow the car to idle better.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>I also want to fit a fuel =
pressure sensor=20
linked into the ECU to keep an eye on fuel pressure.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>Hugh </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DVerdana size=3D2>++44 1224 209 592 =
home</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>++44 7980 443 803 =
mobile</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>++44 1224 312 668 =
fax</FONT></DIV>
<DIV> </DIV><FONT face=3DVerdana size=3D2>
<DIV><BR><A href=3D"mailto:hugh at sol.co.uk">hugh at sol.co.uk</A></DIV>
<DIV> </DIV>
<DIV><BR></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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