Another injector question
Steve Ruse
rusej at letu.edu
Thu Jan 25 16:06:53 GMT 2001
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Hey Bruce, thanks for the help.
Right now, we are still debating MAP vs. MAF, maybe somebody could give =
me some info to help in that area also. What are the benefits of each? =
Also, what is a cheap source for MAF sensors, or could we just take a =
MAS from a car and use it? How much does the shape & size of the intake =
ducting affect the accuracy of a MAS?
Right now I am leaning towards (mostly) software control, via either a =
68 series Motorola processor or through a PC/parallel port. Is there an =
easy & accurate way to implement EFI through hardware only?
What kind of feedback could we use other than O2 sensors, and exactly =
how do O2s figure into your fuel calculations? I know my car's PCM just =
uses long term fuel "trims" to compensate for variances in O2 readings. =
Are O2 numbers ever used in immediate fuel calculations?
Thanks for the help!
Steve Ruse
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Thursday, January 25, 2001 7:56 AM
Subject: Re: Another injector question
>
>OK, we got folks working on SAE cars, kewl.
>Just what are you trying to do?.
>Build, a MAF EFI?.
>Might look first and see if you want to do software answers, or =
hardware.
>Complex, answers, or easy?.
>Tightly controlled feedback might make this real easy.
>
>What are you locked into?.
>Bruce
>
>
>
>
>
>From: Steve Ruse
>Subject: Re: Another injector question
>Hi, my name is Steve Ruse, and I am much in the same position as James. =
I am
>working on a fuel injection system for a Formula SAE car at LeTourneau
>University. I have a lot to learn, and this list looks like a great =
place to
>do that.
>The engine is a 600cc four cyl from a Honda CBR. I also own a '94 Z28 =
and do
>custom EEPROM tuning on it, that is basically where I "cut my teeth" on =
EFI.
>I am interested in the answer to James's last question, and I have also =
have
>some questions of my own.
>First, what are some good sources for injectors? We have some for =
testing,
>but I don't think they are the ones that we will want to use in the =
end.
>What is the best way to test the flow rate of our injectors? Is there
>something better than just timing how long it takes them to move a =
given
>amount of fuel?
>Also, how can we account for the open/close delays of our injectors? =
Could
>that be accurately determined accurately by varying the duty cycle and
>seeing how the flow rate changes from when the injectors are at 100% =
duty
>cycle? Is there an easy way to keep our fuel pressure constant while
>performing this test? We were just going to try using an automotive =
fuel
>pressure regulator.
>Thanks!
>Steve Ruse
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<DIV><FONT face=3D"" size=3D2>Hey Bruce, thanks for the =
help.</FONT></DIV>
<DIV><FONT face=3D"" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"" size=3D2>Right now, we are still debating MAP vs. =
MAF, maybe=20
somebody could give me some info to help in that area also. What are the =
benefits of each? Also, what is a cheap source for MAF sensors, or could =
we just=20
take a MAS from a car and use it? How much does the shape & size of =
the=20
intake ducting affect the accuracy of a MAS?</FONT></DIV>
<DIV><FONT face=3D"" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"" size=3D2>Right now I am leaning towards (mostly) =
software=20
control, via either a 68 series Motorola processor or through a =
PC/parallel=20
port. Is there an easy & accurate way to implement EFI through =
hardware=20
only?</FONT></DIV>
<DIV><FONT face=3D"" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"" size=3D2>What kind of feedback could we use other =
than O2=20
sensors, and exactly how do O2s figure into your fuel calculations? I =
know my=20
car's PCM just uses long term fuel "trims" to compensate for =
variances=20
in O2 readings. Are O2 numbers ever used in immediate fuel=20
calculations?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Thanks for the help!</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Steve Ruse</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>-----Original Message-----<BR>From: =
Bruce Plecan=20
<<A =
href=3D"mailto:nacelp at bright.net">nacelp at bright.net</A>><BR>To: <A=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> <<A=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A>><BR>Date: =
Thursday,=20
January 25, 2001 7:56 AM<BR>Subject: Re: Another injector=20
question<BR><BR></DIV></FONT>><BR>>OK, we got folks working on SAE =
cars,=20
kewl.<BR>>Just what are you trying to do?.<BR>>Build, a MAF=20
EFI?.<BR>>Might look first and see if you want to do software =
answers, or=20
hardware.<BR>>Complex, answers, or easy?.<BR>>Tightly controlled =
feedback=20
might make this real easy.<BR>><BR>>What are you locked=20
into?.<BR>>Bruce<BR>><BR>><BR>><BR>><BR>><BR>>From: =
Steve=20
Ruse<BR>>Subject: Re: Another injector question<BR>>Hi, my name is =
Steve=20
Ruse, and I am much in the same position as James. I am<BR>>working =
on a fuel=20
injection system for a Formula SAE car at LeTourneau<BR>>University. =
I have a=20
lot to learn, and this list looks like a great place to<BR>>do=20
that.<BR>>The engine is a 600cc four cyl from a Honda CBR. I also own =
a '94=20
Z28 and do<BR>>custom EEPROM tuning on it, that is basically where I=20
"cut my teeth" on EFI.<BR>>I am interested in the answer to =
James's=20
last question, and I have also have<BR>>some questions of my=20
own.<BR>>First, what are some good sources for injectors? We have =
some for=20
testing,<BR>>but I don't think they are the ones that we will want to =
use in=20
the end.<BR>>What is the best way to test the flow rate of our =
injectors? Is=20
there<BR>>something better than just timing how long it takes them to =
move a=20
given<BR>>amount of fuel?<BR>>Also, how can we account for the =
open/close=20
delays of our injectors? Could<BR>>that be accurately determined =
accurately=20
by varying the duty cycle and<BR>>seeing how the flow rate changes =
from when=20
the injectors are at 100% duty<BR>>cycle? Is there an easy way to =
keep our=20
fuel pressure constant while<BR>>performing this test? We were just =
going to=20
try using an automotive fuel<BR>>pressure=20
regulator.<BR>>Thanks!<BR>>Steve Ruse</BODY></HTML>
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