Injector Driver

Ward Spoonemore spoonie at deltanet.com
Sun Mar 7 00:02:12 GMT 1999


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If you want more than 2 drivers your out of luck, there are only two drives
on the board,
If you want 6 or 8 standard PFI injectors, GM uses 3 or 4 (6/8) in two
batches. for PFI, the 94/95 PCM has a software mode switch for CPI/PFI and
TBI. This is not to change the drivers but to change calibration functions.
This is a much bigger thing than wiring up some injectors.  This answer your
question ?
Ward
    -----Original Message-----
    From: owner-diy_efi at efi332.eng.ohio-state.edu
[mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Walter Sherwin
    Sent: Saturday, March 06, 1999 5:29 PM
    To: gmecm at efi332.eng.ohio-state.edu; DIY_EFI
    Subject: Injector Driver


    Has anyone played with the injector driver circuitry (two channel TBI -
peak&hold) as found in the 16147060 PCM?   This box is from a 91-93 light
duty truck with 4L80E.  I want to force the drivers to operate as either
6/1.5 A or 8/2 A units, instead of as conventional 4/1 A units.

    I know that this is physically possible, by tailoring the two "current
sense" resistors in the circuit, but I am wondering if anyone knows whether
the rest of the components will stand up to this  current abuse?

    Thanks;
    Walt.




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<DIV><SPAN class=3D989155823-06031999><FONT color=3D#0000ff face=3DArial =
size=3D2>If you=20
want more than 2 drivers your out of luck, there are only two drives on =
the=20
board, </FONT></SPAN></DIV>
<DIV><SPAN class=3D989155823-06031999><FONT color=3D#0000ff face=3DArial =

size=3D2></FONT></SPAN><SPAN class=3D989155823-06031999><FONT =
color=3D#0000ff=20
face=3DArial size=3D2>If you want 6 or 8 standard PFI injectors, GM uses =
3 or 4=20
(6/8) in two batches. for PFI, the 94/95 PCM has a software mode switch =
for=20
CPI/PFI and TBI. This is not to change the drivers but to change =
calibration=20
functions. This is a much bigger thing than wiring up some =
injectors.&nbsp; This=20
answer your question ?</FONT></SPAN></DIV>
<DIV><SPAN class=3D989155823-06031999><FONT color=3D#0000ff face=3DArial =

size=3D2></FONT></SPAN><SPAN class=3D989155823-06031999><FONT =
color=3D#0000ff=20
face=3DArial size=3D2>Ward</FONT></SPAN></DIV>
<BLOCKQUOTE>
    <DIV class=3DOutlookMessageHeader><FONT face=3D"Times New Roman"=20
    size=3D2>-----Original Message-----<BR><B>From:</B>=20
    owner-diy_efi at efi332.eng.ohio-state.edu=20
    [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]<B>On Behalf Of</B> =
Walter=20
    Sherwin<BR><B>Sent:</B> Saturday, March 06, 1999 5:29 =
PM<BR><B>To:</B>=20
    gmecm at efi332.eng.ohio-state.edu; DIY_EFI<BR><B>Subject:</B> Injector =

    Driver<BR><BR></FONT></DIV>
    <DIV><FONT size=3D2>Has anyone played with the injector driver =
circuitry (two=20
    channel TBI - peak&amp;hold) as found in the 16147060 =
PCM?&nbsp;&nbsp; This=20
    box is from a 91-93 light duty truck with 4L80E.&nbsp; I want to =
force the=20
    drivers to operate as either 6/1.5 A or 8/2 A units, instead of as=20
    conventional 4/1 A units.&nbsp; </FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>I know that this is physically possible, by =
tailoring the=20
    two &quot;current sense&quot; resistors in the circuit, but I am =
wondering=20
    if anyone knows whether the rest of the components will stand up to=20
    this&nbsp; current abuse?&nbsp;</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Thanks;</FONT></DIV>
    <DIV><FONT size=3D2>Walt.</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>&nbsp;</FONT></DIV></BLOCKQUOTE></BODY></HTML>

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