[Diy_efi] WOT tuning tool
Karl Walter
krw at efn.org
Thu Feb 17 23:45:55 GMT 2005
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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?=20
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.=20
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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<DIV><FONT face=3DArial size=3D2>OK, I found the signal in the ECU that =
runs the two=20
injector drivers. On the scope it's a nice square wave, varying in =
duty=20
cycle with the throttle position on my bench test. SO... The =
power=20
commanders are $300 and might not work. The kit from=20
jayco as far as I can tell, needs tuned by laptop. I would =
like =20
keep things as simple as possible and analog, and just have a =
pot to=20
turn. Something you can do while driving. Here's what I am=20
thinking: Pulse from ECU ----> pulse width to voltage circuit =
--->=20
amplify/attenuate circuit with pot --->voltage to pulse width=20
circuit.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>The 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? Part of a pulse width monitor maybe? </FONT></DIV>
<DIV> </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> </DIV>
<DIV><FONT face=3DArial size=3D2>The wide band tuning method,(I'm =
asking) this would=20
entail doing runs and datalogging the mixture, rpm, tps, then using this =
info to=20
set the wot parameters in the ecu, correct? For me the problem =
with that=20
is that if the parameters are way far off, it takes a bunch of runs just =
to get=20
in the ball park. I like to have helpers to the test drives, as I =
need to=20
mind the shop. It's easy for them to go out with something running =
really=20
lean and do it in, or foul plugs and be stranded. If they had a =
quick way=20
to correct the mixture, then the run could be much more effictive and =
less=20
destructive. How little could a wb setup run, say a kit, software =
and=20
cables, and the o2 sensor itself? $200?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>--Karl</FONT></DIV></BODY></HTML>
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