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


Doug,
let me know when you are in the area.
On supercharged engines, the mass air still works great. you will need to
run a wide band O2 for tuning. Nothing special for the tuning except you
will change the fuel map richer once the airflow is enough for boost.
Once up on boost, the mixture will need to be richened up to around 12.5 to
1. This number is safe for most high performance piston engines.
The rotary under boost will also be detonation sensitive, and I would not go
leaner than this without a knock sensor. Without all the recip noise, the
knock sensor will be easy to read.
Larry