Anyone here good with generic analog Data Acquisition?
Thread Starter
Joined: Nov 2001
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From: Cecil County Raceway!!!
Anyone here good with generic analog Data Acquisition? Our shop has a portable wideband O2 sensor. I was thinking that a 2 channel data acquisition setup would be awesome if I could capture the voltage output of the O2 sensor along with a tach signal from the PCM. Problem is that I'm only familiar with acquiring pure voltage signals. Any way of 'directly' capturing the frequency of the tach signal and directly making it a voltage output?
This setup would be ideal for tuning with LS1 edit on the street <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Thanks
This setup would be ideal for tuning with LS1 edit on the street <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Thanks
Teching In
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Re: Anyone here good with generic analog Data Acquisition? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fireball:
<strong>Our shop has a portable wideband O2 sensor. I was thinking that a 2 channel data acquisition setup would be awesome if I could capture the voltage output of the O2 sensor along with a tach signal from the PCM. Problem is that I'm only familiar with acquiring pure voltage signals. Any way of 'directly' capturing the frequency of the tach signal and directly making it a voltage output?
This setup would be ideal for tuning with LS1 edit on the street <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Thanks</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You can use a scan tool such as an Autotap to graph the voltages from the O2 sensors. The scan tools can also display RPM's, AIR flow, Pressure, etc...
<strong>Our shop has a portable wideband O2 sensor. I was thinking that a 2 channel data acquisition setup would be awesome if I could capture the voltage output of the O2 sensor along with a tach signal from the PCM. Problem is that I'm only familiar with acquiring pure voltage signals. Any way of 'directly' capturing the frequency of the tach signal and directly making it a voltage output?
This setup would be ideal for tuning with LS1 edit on the street <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Thanks</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You can use a scan tool such as an Autotap to graph the voltages from the O2 sensors. The scan tools can also display RPM's, AIR flow, Pressure, etc...
Thread Starter
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From: Cecil County Raceway!!!
Re: Anyone here good with generic analog Data Acquisition? well Atap wouldn't handle output of a wideband unless it were somehow wired back into the B1S2 O2 sensor. Wonder if that would work <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
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From: Godspeed
Re: Anyone here good with generic analog Data Acquisition? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">well Atap wouldn't handle output of a wideband unless it were somehow wired back into the B1S2 O2 sensor. Wonder if that would work </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No that would not work, the widebands and stock O2's put out completely different signals.
http://fjoinc.com/automotive/WBO2details.htm#afrdis
<small>[ March 18, 2002, 09:40 AM: Message edited by: Godspeed ]</small>
http://fjoinc.com/automotive/WBO2details.htm#afrdis
<small>[ March 18, 2002, 09:40 AM: Message edited by: Godspeed ]</small>
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From: College Station, Tx
Re: Anyone here good with generic analog Data Acquisition? This works on LT1's, and I believe it is the same on LS1's
Your AC pressure switch takes a 0-5v input, which should cover the output range of the wideband with room to spare. Run the logging wires of the to the a/c pressure input, temporarily cutting the a/c pressure sensor.
You can now use autotap and log rpm, map, maf, a/c pressure, timing, and whatever else. To go backwards to a/f ratio I would try a couple of test voltages on the a/c input wires (you could use a battery/batteries) and derive the input voltage to pressure transfer function. Apply this in reverse to your logged pressure and you now have a logging of your wideband output voltage. You then need to apply the o2 transfer function to derive a/f ratio. You can do it all in one easy step in excel.
If the a/c pressure doesn't work for you (voltage range is changed, etc.) then see if you can find another sensor on the car that will work.
Chris
Your AC pressure switch takes a 0-5v input, which should cover the output range of the wideband with room to spare. Run the logging wires of the to the a/c pressure input, temporarily cutting the a/c pressure sensor.
You can now use autotap and log rpm, map, maf, a/c pressure, timing, and whatever else. To go backwards to a/f ratio I would try a couple of test voltages on the a/c input wires (you could use a battery/batteries) and derive the input voltage to pressure transfer function. Apply this in reverse to your logged pressure and you now have a logging of your wideband output voltage. You then need to apply the o2 transfer function to derive a/f ratio. You can do it all in one easy step in excel.
If the a/c pressure doesn't work for you (voltage range is changed, etc.) then see if you can find another sensor on the car that will work.
Chris
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From: Cecil County Raceway!!!
Re: Anyone here good with generic analog Data Acquisition? excellent idea Chris....why didn't I just ask this earlier <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
first thing I'll do is monitor voltage off the WB alone and see what its range is then I'll try that if its truly 0-5 V
first thing I'll do is monitor voltage off the WB alone and see what its range is then I'll try that if its truly 0-5 V
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From: Cecil County Raceway!!!
Re: Anyone here good with generic analog Data Acquisition? figures <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />
I'll find something else maybe <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
I'll find something else maybe <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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From: College Station, Tx
Re: Anyone here good with generic analog Data Acquisition? I think it should actually be closer to 1-4v or somewhere around there, depending on what sensor/kit it is (NTK, LSM-11, etc.)
Chris
Chris
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From: the moon
Re: Anyone here good with generic analog Data Acquisition? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Your AC pressure switch takes a 0-5v input, which should cover the output range of the wideband with room to spare. Run the logging wires of the to the a/c pressure input, temporarily cutting the a/c pressure sensor.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">sorry won't work with a-tap. For some reason they left out logging capability for this particular parameter.
You can view it real time but it will not log and logging comes back with a static mumbo jumbo trace set.
I tried it last year on both windows and dos versions of a-tap.
Really pissed me off as I had converted the sensor to be able to use it to log either fuel pressure or boost pressure .
And I would not have high hopes of a-tap fixing that as they are slower than a snails pace with software revisons.
Steve
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">sorry won't work with a-tap. For some reason they left out logging capability for this particular parameter.
You can view it real time but it will not log and logging comes back with a static mumbo jumbo trace set.
I tried it last year on both windows and dos versions of a-tap.
Really pissed me off as I had converted the sensor to be able to use it to log either fuel pressure or boost pressure .
And I would not have high hopes of a-tap fixing that as they are slower than a snails pace with software revisons.
Steve