[Diy_efi] New to list, have questions
Brian McMahan
BMcMahan at superchips.com
Wed Jul 14 17:58:33 GMT 2004
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If the Honda injector box interests you they are in almost all 88-91 =
civics and CRX's. they can be found all over the internet =
partstrader.com, honda-tech.com etc...
=20
=20
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On =
Behalf Of Daniel R. Nicoson
Sent: Wednesday, July 14, 2004 12:30 PM
To: A list for Do-It-Yourself EFI
Subject: RE: [Diy_efi] New to list, have questions
Bobby,
=20
You have some choices. You can go with the resistor method or build a P =
& H driver. =20
=20
Basically with the resistor you are adding a resistor in series with =
each injector to achieve the same 15 ohms resistance that your OEM =
injectors had. So if your lo-impedance injectors are 4 ohms, you will =
need a resistor of about 11 ohms. Keep in mind this resistor will have =
to carry almost an amp of current so it needs to be capable of that =
load. I have "heard" that late 1980's Honda's used resistors like this. =
You might get lucky and find some in a junk yard. (or check in on =
yahoo groups JYturbo and ask Joseph if he has any he would sell cheap, =
he's a Honda guy).
=20
The downside to the resistor method is that you will loose some response =
time at idle and low power settings. Since you are restricting the =
current flow through the low impedance injectors, they won't develop the =
same force to snap open the injector as they were intended to do. If =
idle quality and emissions are a concern you might have trouble without =
a proper P & H injector driver.
=20
For example, I run 30# injectors on my 1994 Mustang. It idles around =
2-3ms for the pulse width. If I had 60# injectors, I would only be =
idling around 1-1.5ms. It just so turns out that it takes all of 1.5 to =
2.0 ms to open a high impedance injector. A lo-impedance injector with =
a proper driver will open in 1.5ms or less. So I could survive with =
reasonable idle with the bigger injectors but not if I didn't use a =
proper driver. (the car would obviously run, I would just have to =
compromise idle quality and possibly emissions).
=20
If you want to research and build your own P & H injector driver, go to =
Digi-Key.com and search for the LM1949. This is a solenoid controller. =
Pull down the data sheet, they have a typical circuit in there.
=20
I do have a design I was going to post one of these days but I have =
another project to finish in front of the lo-z driver board.
=20
What power level are you trying to achieve? What size injectors do you =
think you'll need? How are you tuning the computer, EEC Tuner or =
TwEECer? Don't go any bigger than you need to on injectors.
=20
Dan
=20
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On =
Behalf Of Bobby C
Sent: Wednesday, July 14, 2004 1:53 AM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] New to list, have questions
Hey, my name is Bobby. I am new to this list, and have a few question =
that you guys, especially Ford gurus might have an answer for.
=20
I am building a TT mustang and I want to upgrade to low impedance =
injectors to meet my fuel demands. To do this with the a9l computer on =
my mustang, i was told i had to wire up a resistor box. This resistor =
box can be made from a few Radio Shack components, and beeing an avid =
diy'er, i want to build it myself, and wire it myself into the stock =
ecu. Does anyone have and links/info/parts numbers that they would be =
able to help me out with. =20
=20
=20
TIA
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<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D540424417-14072004><FONT face=3DTahoma =
color=3D#ff0000 size=3D2>If=20
the Honda injector box interests you they are in almost all 88-91 civics =
and=20
CRX's. they can be found all over the internet partstrader.com, =
honda-tech.com=20
etc...</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT face=3D"Copperplate Gothic Light" size=3D2></FONT> </P>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
diy_efi-bounces at diy-efi.org=20
[mailto:diy_efi-bounces at diy-efi.org]<B>On Behalf Of </B>Daniel R.=20
Nicoson<BR><B>Sent:</B> Wednesday, July 14, 2004 12:30 =
PM<BR><B>To:</B> A list=20
for Do-It-Yourself EFI<BR><B>Subject:</B> RE: [Diy_efi] New to list, =
have=20
questions<BR><BR></FONT></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Bobby,</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>You=20
have some choices. You can go with the resistor method or build =
a P=20
& H driver. </FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Basically with the resistor you are adding a resistor in =
series with=20
each injector to achieve the same 15 ohms resistance that your OEM =
injectors=20
had. So if your lo-impedanc</FONT></SPAN><SPAN=20
class=3D871350616-14072004><FONT face=3DArial color=3D#0000ff =
size=3D2>e injectors are=20
4 ohms, you will need a resistor of about 11 ohms. Keep in mind =
this=20
resistor will have to carry almost an amp of current so it needs to be =
capable=20
of that load. I have "heard" that late 1980's Honda's used =
resistors=20
like this. You might get lucky and find some in a junk =
yard. (or=20
check in on yahoo groups JYturbo and ask Joseph if he has any he would =
sell=20
cheap, he's a Honda guy).</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>The=20
downside to the resistor method is that you will loose some response =
time at=20
idle and low power settings. Since you are restricting the =
current flow=20
through the low impedance injectors, they won't develop the same force =
to snap=20
open the injector as they were intended to do. If idle quality =
and=20
emissions are a concern you might have trouble without a proper P =
& H=20
injector driver.</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>For=20
example, I run 30# injectors on my 1994 Mustang. It idles around =
2-3ms=20
for the pulse width. If I had 60# injectors, I would only be =
idling=20
around 1-1.5ms. It just so turns out that it takes all of 1.5 to =
2.0 ms=20
to open a high impedance injector. A lo-impedance injector with =
a proper=20
driver will open in 1.5ms or less. So I could survive with =
reasonable=20
idle with the bigger injectors but not if I didn't use a proper =
driver. =20
(the car would obviously run, I would just have to compromise idle =
quality and=20
possibly emissions).</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>If=20
you want to research and build your own P & H injector driver, go =
to=20
Digi-Key.com and search for the LM1949. This is a solenoid=20
controller. Pull down the data sheet, they have a typical =
circuit in=20
there.</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>I do=20
have a design I was going to post one of these days but I have another =
project to finish in front of the lo-z driver =
board.</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff size=3D2>What=20
power level are you trying to achieve? What size injectors do =
you think=20
you'll need? How are you tuning the computer, EEC Tuner or=20
TwEECer? Don't go any bigger than you need to on=20
injectors.</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Dan</FONT></SPAN></DIV>
<DIV><SPAN class=3D871350616-14072004><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
diy_efi-bounces at diy-efi.org =
[mailto:diy_efi-bounces at diy-efi.org]<B>On Behalf=20
Of </B>Bobby C<BR><B>Sent:</B> Wednesday, July 14, 2004 1:53=20
AM<BR><B>To:</B> diy_efi at diy-efi.org<BR><B>Subject:</B> [Diy_efi] =
New to=20
list, have questions<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Hey, my name is Bobby. I am =
new to this=20
list, and have a few question that you guys, especially Ford gurus =
might=20
have an answer for.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I am building a TT mustang and I =
want to=20
upgrade to low impedance injectors to meet my fuel demands. To =
do this=20
with the a9l computer on my mustang, i was told i had to wire up a =
resistor=20
box. This resistor box can be made from a few Radio Shack =
components,=20
and beeing an avid diy'er, i want to build it myself, and wire it =
myself=20
into the stock ecu. Does anyone have and links/info/parts =
numbers that=20
they would be able to help me out with. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial=20
size=3D2>TIA</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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