Airflow meter discussion

[Jon Snoddy]

Isn't that what a map sensor is (two sensors that measure pressure on either
side of the throttle)?  Assuming there isn't a meaningful pressure drop
across air filter (or at least that it is linear), it measures the delta
between the manifold pressure and atmospheric?

-jon

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On Behalf
Of Howard Chu
Sent: Thursday, November 22, 2001 3:06 PM
To: diy_efi at diy-efi.org
Cc: asword at telus.net; Eugene Y C Chu
Subject: RE: Airflow meter discussion

>From all the previous discussion, I gathered that in a flapper type (or in
my case, Measuring Core Volume Air Flow) meter, the flap displacement is
proportional to the difference in pressure between the front and back of the
flapper. The obvious solution then: why not remove the meter, and use two
pressure sensors instead, one before and one after the throttle body? Given
the throttle body dimensions, all you need is to convert the pressure
difference to density, multiply by throttle body volume and you have mass.
No additional flow restrictions, and no VE curve mapping required.

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support

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