Thanks for taking to write all this stuff guys. Very interesting. I
may take the plunge and buy the book Dennis refers to.

On 11/17/13, David Beierl <dbeierl@attglobal.net> wrote:
> At 01:32 AM 11/17/2013, Scott Daniel wrote:

>
>>( I don't know if the ECU can sense 'rate of change of throttle
>>position'.  I  suspect not on Difijet and Digifant.
>
> The ECU *could* calculate rate of change of *airflow,* but I don't
> know whether it does.

Can throttle position (if required by Digijet or Digifant) be roughly
determined by the AFM wiper position?

>>if anyone finds this interesting...here is why an Air Mass Meter is a
>>huge advance over an Air Flow Meter.
>>An AFM has mechanical contacts in it ..those wear. AFM's run 'uneven'
>>after a while.
>>The flapper door is anther obstruction in the air intake path . A choke
>>point.

> Another reason is that the mass meter actually measures the mass of
> air passing through.  With an AFM the ECU has to consult the air
> intake temperature and calculate the mass based on temperature.

I'm not certain that it functions in the same or similar manner, but
there is an intake air temp sensor present on my Motronic 2.9 which
uses a MAF.

Neil.

--
Neil n

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