Doug, this is what it looks like. I'll try to get into
  the manual to find
  out the pin-out functions.
  C. Smith



  Thanks.  Some air appears to have to flow through the
  device adding to
  restriction or enlargement of the manifold.  What size is
  it?  Do you
  have an idea where it was place in the system?  I am
  guessing the air
  box.

  Doug in Japan


  Doug,
  On the fords, they are mounted in a 75mm dia plastic tube
  with the air
  filter on the inlet side. That is for a 220 to 285hp engine
  series.
  For the rotary, make a 70 to 75mm tube with a fabricated
  flange to mount the
  air flow sensor. that will size it for up to 300 hp. Above
  that we go to the
  Lightning 90mm body with the same sensor.
  The 90mm lightning sensor body is good for 525 hp before it
  is maxed out.
  It is better to be a little on the big side than small.
  When tuning we never
  want the sensor output to be over 4.5 volts. the sensor
  "rails" at around
  4.75 or 4.8 volts, and then just flows more air without
  telling the computer
  you need more fuel.

  Mount the tube on the inlet of the air box feeding the
  tuned inlet tubes.
  ideal size for the box should be at least 4X the volume of
  the combined
  tuned tubes, and more is better due to the strong pulsing.

  Let me know if you need a model or drawing of the setup, as
  I have a
  lightning unit on the shelf that I can measure and draw up.
  I need to get together with Paul so he can publish a good
  "do and don't do"
  list for using the ford maf sensors. used correctly, they
  are great. set up
  wrong..... things go lean and ugly in a hurry. been there.
  Larry

  Larry,

  Thanks. I'll be in your neck of the woods in early June
  replacing the
  starter motor on my other bird.  So I may be able to drop
  by if you have
  time for lunch. As my rotary engine could very well be over
  300 hp
  occassionally I think using the larger Lightning MAF 90mm
  is a good
  idea. A picture of the device would help as I know you are
  a busy guy.
  Yes I agree on the air box size info.  Shape is also
  important I'm
  told.  The  racers here often use a large tube with hemi
  spherical end
  caps.  The 20B was boosted so the box was smaller but
  shaped the same.
  Air like water takes the path of least resistance the only
  way to
  confirm the airflow is balanced in the manifold is to flow
  test them.

  I am still not exactly clear on  how to create the engine
  fueling map
  when an engine is boosted.  I'm using the MegaSquirt
  device which
  allows for custom formulae to create fueling tables. I am
  guessing I
  would still have to sample MAP or actually deck pressure to
  tweak  the
  MAF sensor data which calculates flow based on known tube
  diameter,
  temp, and air speed. Perhaps having both sensors nearby
  each other would
  be the best of both worlds.

  Doug


  Larry,

  I found it on E-Bay.
  http://tinyurl.com/o6na5k

  Doug


 Here are some more, I think the 90mm is a bit less expensive here.

 http://www.blueovalindustries.com/products.php?catID=9902232

 C. Smith


 Larry or Craig,

 I am probably going to order the 90mm diameter MAF sensor as it has less
 restriction than the 61mm unit.  Do either of you know how to calibrate
 it or does it come calibrated assuming it will be used  flowing into an
 Ford airbox?


 Thanks

 Doug

Doug and Paul,
    Megasquit has some good info on MAF. It specifically has data on
the 'Ford MAF' and the 'Nissan Inifnti Q45 MAF' Sensors.
"http://www.microsquirt.info/mafmap.htm"

I am still here,
Blake

I converted mg/sec to pounds per minute which is more common
form in most of the old books on engines.

Switching to the metric system is a nightmare because of this.

Paul Lamar