Measuring MAF

[John Dammeyer]

Hi,

I'll put in my two cents here.    Don't know how clever you are with electronics
but if you purchase a differential pressure transducer you can build a simple
flow meter by measuring the difference in pressure at two points.  Create a
supply tube that has a restriction and measure the pressure at the restriction
and the point before the restriction.  (venturi in effect).  As long as you
know the temperature of the air flow and the size of the tubes you can calculate
the airflow.  Then,  just use a DC powered fan with a variable power supply to
push air through this pipe into the MAF sensor.

Alternatively,  you might be able to rent a hot wire anemometer from an air
conditioning firm and if you place that in the air stream of your air supply you
can also calibrate the MAF sensor.  I'm willing to bet that once you get a few
accurate set points you can probably extrapolate the entire curve.

BTW.  Thanks for the info on the SAAB.  I have a 900 Turbo.

Regards,

John

>Date: Fri, 10 Sep 1999 20:13:57 -0400
>From: bjanesi at juno.com
>Subject: Volvo/Saab Bosch MAF swap for VAF


[snip]

>
>If it turns out that adjusting the MAF output in a monolithic fashion can
>not closely reproduce the original VAF output, I'll have to look at a
>"black box" solution from vendors such as Split Second or Pro-M which
>provide the ability to have 2 or 3 adjustments to the MAF depending upon
>the flow.  I'm not smart enough to figure that one out myself.
>
>Any comments, corrections, open discusions, etc are welcome.
>
>Brad Anesi
>(bjanesi at juno.com)
>