AFM calibration?

[Clare Snyder]

Francois Dion wrote:
> 
> I know nobody would want to use an airflow meter
> as used in an L-jet setup nowadays, however I have
> an older car that has that restrictive setup and I'd like
> to adjust it for better flow. How can I know what is a good
> tension on the spring?  I know the looser, the better
> airflow, however I think this can bring me a few
> problems if it's too loose. I know this affect the
> fuel economy as the hp goes up (in combo with
> a free flowing air filter of course) but what other
> side effects are there?
> 
> Should I instead forget the AFM and try to find
> another sensor that could be used instead? The
> setup is Bosch L-jetronic in a Lancia Zagato. I do
> believe it's the exact same setup as in a Fiat 2000
> spider. All components are 81 except the AFM
> which is a 79 and is the all aluminium type (except
> for the cover over the spring).
> 
> Ciao,
> Francois Dion (francois at hyperreal.org)
> --
> Member: FLU #1722, PCNA
> http://www.fortunecity.com/silverstone/zagato/101/launch.html
> Alfa Romeo, Fiat, Lancia, Peugeot, Volvo, Solex

Changing the spring has negligable effect on airflow, but an extreme
effect on mixture. Loosening the spring makes the engine run richer -
not much change in tension makes a BIG change in fuel delivery.
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