[Diy_efi] WOT tuning tool

Daniel Nicoson A6intruder at adelphia.net
Fri Feb 18 15:00:52 GMT 2005


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Pulse width to voltage:  use a LF198/LF298/LF398

Go to Digi Key and pull down the data sheet.

Dan Nicoson


  -----Original Message-----
  From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Karl Walter
  Sent: Thursday, February 17, 2005 6:45 PM
  To: A list for Do-It-Yourself EFI
  Subject: RE: [Diy_efi] WOT tuning tool


  OK, I found the signal in the ECU that runs the two injector drivers.  On
the scope it's a nice square wave, varying in duty cycle with the throttle
position on my bench test.  SO...  The power commanders are $300 and might
not work.  The kit from jayco as far as I can tell, needs tuned by laptop.
I would like  keep things as simple as possible and  analog, and just have a
pot to turn.  Something you can do while driving.  Here's what I am
thinking:  Pulse from ECU ----> pulse width to voltage circuit --->
amplify/attenuate circuit with pot --->voltage to pulse width circuit.

  The  amplify/attenuate could be done with an op amp, and there is a really
simple 555 v to pulsewidth ckt I've used in the past, So I just have to find
a pulse width to voltage ckt. Any thoughts there?  Part of a pulse width
monitor maybe?

  I made a vss calibrator this way, and it worked well, but it used a
frequency to voltage circuit instead of a pulse width to voltage.

  The wide band tuning method,(I'm asking) this would entail doing runs and
datalogging the mixture, rpm, tps, then using this info to set the wot
parameters in the ecu, correct?  For me the problem with that is that if the
parameters are way far off, it takes a bunch of runs just to get in the ball
park.  I like to have helpers to the test drives, as I need to mind the
shop.  It's easy for them to go out with something running really lean and
do it in, or foul plugs and be stranded.  If they had a quick way to correct
the mixture, then the run could be much more effictive and less destructive.
How little could a wb setup run, say a kit, software and cables, and the o2
sensor itself? $200?



  --Karl

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<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D881215514-18022005><FONT face=3DArial color=3D#0000ff =
size=3D2>Pulse=20
width to voltage:&nbsp; use a LF198/LF298/LF398</FONT></SPAN></DIV>
<DIV><SPAN class=3D881215514-18022005><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D881215514-18022005><FONT face=3DArial color=3D#0000ff =
size=3D2>Go to=20
Digi Key and pull down the data sheet.</FONT></SPAN></DIV>
<DIV>&nbsp;</DIV>
<P><FONT size=3D2>Dan Nicoson<BR>&nbsp;</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>Karl=20
  Walter<BR><B>Sent:</B> Thursday, February 17, 2005 6:45 =
PM<BR><B>To:</B> A=20
  list for Do-It-Yourself EFI<BR><B>Subject:</B> RE: [Diy_efi] WOT =
tuning=20
  tool<BR><BR></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>OK, I found the signal in the ECU =
that runs the=20
  two injector drivers.&nbsp; On the scope it's a nice square wave, =
varying in=20
  duty cycle with the throttle position on my bench test.&nbsp; =
SO...&nbsp; The=20
  power commanders are $300 and&nbsp;might&nbsp;not work.&nbsp; The kit =
from=20
  jayco&nbsp;as far as I can tell, needs tuned by laptop.&nbsp; I would=20
  like&nbsp; keep things&nbsp;as simple as possible and &nbsp;analog, =
and just=20
  have a pot to turn.&nbsp; Something you can do while driving.&nbsp; =
Here's=20
  what I am thinking:&nbsp; Pulse from ECU ----&gt; pulse width to =
voltage=20
  circuit ---&gt; amplify/attenuate circuit with pot ---&gt;voltage to =
pulse=20
  width circuit.</FONT></DIV>
  <DIV>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>The&nbsp; amplify/attenuate could be =
done with an=20
  op amp, and there is a really simple 555 v to pulsewidth ckt I've used =
in the=20
  past, So I just have to find a pulse width to voltage ckt. Any =
thoughts=20
  there?&nbsp; Part of a pulse width monitor maybe? </FONT></DIV>
  <DIV>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>I made a vss calibrator this way, and =
it worked=20
  well, but it used a frequency to voltage circuit instead of a pulse =
width to=20
  voltage. </FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>The wide band tuning method,(I'm =
asking) this=20
  would entail doing runs and datalogging the mixture, rpm, tps, then =
using this=20
  info to set the wot parameters in the ecu, correct?&nbsp; For me the =
problem=20
  with that is that if the parameters are way far off, it takes a bunch =
of runs=20
  just to get in the ball park.&nbsp; I like to have helpers to the test =
drives,=20
  as I need to mind the shop.&nbsp; It's easy for them to go out with =
something=20
  running really lean and do it in, or foul plugs and be stranded.&nbsp; =
If they=20
  had a quick way to correct the mixture, then the run could be much =
more=20
  effictive and less destructive.&nbsp; How little could a wb setup run, =
say a=20
  kit, software and cables, and the o2 sensor itself? $200?</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;</DIV>
  <DIV><FONT face=3DArial =
size=3D2>--Karl</FONT></DIV></BLOCKQUOTE></BODY></HTML>

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