[Diy_efi] Pulse width meter

Sat Dec 4 17:03:15 GMT 2004

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Vacuum shouldn't effect lb hour of the injectors.  The regulator changes
the fuel pressure to balance the effect of the vacuum trying to suck the
fuel in when the injector opens.  High vacuum, lower fuel pressure, no
vacuum, higher pressure.  I would think that the change in fuel pressure
shouldn't mess up your calculations.

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Chris Carson
Sent: Saturday, December 04, 2004 1:49 AM
To: A list for Do-It-Yourself EFI
Subject: Re: [Diy_efi] Pulse width meter

I may be thinking way too simply, but it seems to me if you can measure
pulse width, you calculate duty cycle, and coupled with the constant of
injector flow lb/hr, you can get a reasonably accurate measurement of
the amount of fuel being injected into the engine. Of course, vacuum
would play a part (unless, of course, the flow of an injector isn't
affected all that much by vacuum, because of the regulator), and of
course MPH can be gotten from the VSS, too. But the main concern is
getting the fuel used data.
I wonder?
Chris
----- Original Message ----- 
From: David Cooley <mailto:n5xmt at bellsouth.net>  
To: A list for <mailto:diy_efi at diy-efi.org>  Do-It-Yourself EFI 
Sent: Friday, December 03, 2004 10:24 AM
Subject: Re: [Diy_efi] Pulse width meter

too many variables to base it on PW...  Would have to input RPM, MPH,
Pressure etc...
best to use a flow meter (on a returnless system... on a return system,
need 2 flow meters, one for incoming, one for return to subtract that
volume), and MPH

-------Original Message-------

From: Chris Carson <mailto:fastcarson at prodigy.net> 
Date: 12/03/04 09:57:40
To: A list for Do-It-Yourself EFI <mailto:diy_efi at diy-efi.org> 
Subject: Re: [Diy_efi] Pulse width meter

Has anyone ever used a pulse width meter to provide information for a
gas
mileage/fuel used/trip computer?

Chris

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<div class=3DSection1>

Vacuum shouldn&#8217;t effect lb =
hour of
the injectors.&nbsp; The =
regulator
changes the fuel pressure to balance the effect of the vacuum trying to =
suck
the fuel in when the injector opens. &nbsp;High vacuum, =
lower fuel
pressure, no vacuum, higher pressure.&nbsp; I would think that the change =
in fuel
pressure shouldn&#8217;t mess up your =
calculations.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
diy_efi-bounces at diy-efi.org
[mailto:diy_efi-bounces at diy-efi.org] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>Chris Carson<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Saturday, December =
04, 2004
1:49 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> A list for =
Do-It-Yourself EFI<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: [Diy_efi] =
Pulse width
meter</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

I may be thinking way too =
simply,
but it seems to me if you can measure pulse width, you calculate duty =
cycle,
and coupled with the constant of injector flow lb/hr, you can get a =
reasonably
accurate measurement of the amount of fuel being injected into the =
engine. Of
course, vacuum would play a part (unless, of course, the flow of an =
injector
isn't affected all that much by vacuum, because of the regulator), and =
of
course MPH can be gotten from the VSS, too. But the main concern is =
getting the
fuel used data.<o:p></o:p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>I =
wonder?</span></font><font
face=3DArial><span =
style=3D'font-family:Arial'><o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Chris</span></font><font =
face=3DArial><span
style=3D'font-family:Arial'><o:p></o:p></span></font></p>

</div>

<blockquote style=3D'border:none;border-left:solid black =
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>

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<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- <o:p></o:p></span></font></p>

</div>

<div style=3D'font-color:black'>

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face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:n5xmt at bellsouth.net" title=3D"n5xmt at bellsouth.net">David =
Cooley</a> <o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:diy_efi at diy-efi.org" title=3D"diy_efi at diy-efi.org">A list =
for
Do-It-Yourself EFI</a> <o:p></o:p></span></font></p>

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<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Friday,
December 03, 2004 10:24 AM<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Re:
[Diy_efi] Pulse width meter<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3DArial><span
style=3D'font-size:12.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></fo=
nt></p>

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style=3D'width:100.0%;mso-cellspacing:0in;margin-left:.5in;mso-padding-al=
t:1.5pt 1.5pt 1.5pt 1.5pt'
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  <td width=3D"100%" style=3D'width:100.0%;padding:1.5pt 1.5pt 1.5pt =
1.5pt;
  cursor:auto' id=3DINCREDITEXTREGION>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>too many variables to base it on PW...&nbsp; Would =
have to
  input RPM, MPH, Pressure etc...<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>best to use&nbsp;a flow meter (on a returnless =
system...
  on a return system, need 2 flow meters, one for incoming, one for =
return to
  subtract that volume), and MPH<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>
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  <p class=3DMsoNormal><i><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial;font-style:italic'>-------Original =
Message-------</span></font></i><font
  face=3DArial><span =
style=3D'font-family:Arial'><o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>
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  <div id=3Dreceivestrings>
  <div>
  <p class=3DMsoNormal><b><i><font size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;
  =
font-family:Arial;font-weight:bold;font-style:italic'>From:</span></font>=
</i></b><font
  size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;font-family:Arial'> <a
  href=3D"mailto:fastcarson at prodigy.net">Chris =
Carson</a><o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><b><i><font size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;
  =
font-family:Arial;font-weight:bold;font-style:italic'>Date:</span></font>=
</i></b><font
  size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;font-family:Arial'> 12/03/04
  09:57:40<o:p></o:p></span></font></p>
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  <p class=3DMsoNormal><b><i><font size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;
  =
font-family:Arial;font-weight:bold;font-style:italic'>To:</span></font></=
i></b><font
  size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;font-family:Arial'> <a
  href=3D"mailto:diy_efi at diy-efi.org">A list for Do-It-Yourself =
EFI</a><o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><b><i><font size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;
  =
font-family:Arial;font-weight:bold;font-style:italic'>Subject:</span></fo=
nt></i></b><font
  size=3D2 face=3DArial><span =
style=3D'font-size:11.0pt;font-family:Arial'> Re:
  [Diy_efi] Pulse width meter<o:p></o:p></span></font></p>
  </div>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>Has anyone ever used a pulse width meter to provide
  information for a gas<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>mileage/fuel used/trip =
computer?<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
style=3D'font-size:12.0pt;
  font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>
  </div>
  <div>
  <p class=3DMsoNormal><font size=3D3 face=3DArial><span =
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  font-family:Arial'>Chris<o:p></o:p></span></font></p>
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