My New Years resolution is getting my dyno working.
  I am getting together all the parts that I need.
  I have a running P-port RX8 engine for testing.

  One of the other things I need is a wide band mixture monitor.
  Rather than have just a digital read out I would like to record the data
  on a Hytek Automation 12 bit  8 channel data acq USB module which I have.
  I intend to try out several different EFI systems and eventually turbo
  compounding. This information is essential for tuning the EFI systems.

  I ran across this Australian company on the net.
  Anybody have an experience with this company?
  http://www.techedge.com.au/vehicle/wbo2/
  http://www.techedge.com.au/vehicle/wbo2/wbntk.htm

  What I like about this system is it's compatible with a data acquisition
  system.

  Here is the wide band problem in a nut shell. The Bosch wide band
  sensor puts a current out  ranging from a minus to a plus and I need a
  linear voltage out put in the range of zero to 5 volts. This company
  sells the box that does the conversion and a digital display.  It is
  generated by a 12 bit Digital to Analog Converter using a 65 word
  lookup table (with linear interpolation for improved resolution).

  Don't confuse this with some of the narrow band O2 sensor systems.


  Paul Lamar


Paul,

I'm sure you know, a single wire sensor + EGT can get you quite a bit
of info...  Peak EGT is very near stoich.  The single wire O2 sensor
tells you which side you're on.  You don't know absolute mixture, but
you can use the pair to know comparatively how rich or lean you are.

Matt-


Yes but this device comes with a computer that converts the non linear sensor output to a linear zero to five volt analog signal over a 10:1 to 20:1 mixture range. EXTREMELY important when one is dealing with HIGHLY experimental fuel injection systems. The rotary engine will fool you because it is capable of running over this entire range of mixtures. I have seen it happen on the dyno using a wide band mixture monitor. IMHO don't leave home with out it :)

It is pin 7 output that I am the most interested in and that is what this table  is all about. One can connect a simple voltmeter to this pin and read out the mixture  value that is directly proportional to the mixture. One can also feed it into a computer and have a plot of the mixture over a wide range of throttle openings and engine load. Since the manifold pressure sensor also outputs a voltage in this range and the engine torque sensor also outputs voltage in this range the use of a low cost Hytek Automation data acquisition system can give a overall picture of the operation of the  EFI as well as a plot of HP, fuel consumption and torque readings over the entire RPM range. In other words a complete and very low cost instrumentation system to go along with our very low cost dyno.


Paul Lamar