Air flow measurement

[Mazda Ebrahimi]

To Tom Cloud (and everybody else):

I want to put up another aspect of using TPS and delta P and IAT for 
flow measurement.  As the gentelman from Orbital (forgive me for not 
remembering your name, but I erased all my message files...) pointed 
out, air flow reversion causes an error in MAF systems.  Wouldn't these 
same dynamic flow characteristics cause an error with the TPS method 
(especially at WOT)?

Also, a while ago I read (somewhere) about a flapper system being tested 
for introduction on some Cadillac engines.  Each intake runner would 
have a flapper in it (near the intake valve) that prevented flow from 
comming back into the plenum.  I believe at the time the system had met 
their durability requirements, but they were concerned about additional 
noise because of their luxury line of cars.  Has anyone else heard 
anything about this?  

Not only will this flapper possibly allow more valve openning duration, 
but it would minimize pressure pulses in the manifold.  Judging from our 
discussions so far, no matter what kind of measurement system is used, 
the results would be more accurate using this system. Right?

Best Regards,
Mazda Ebrahimi