AFM calibration?

[Martin Hill]

You will also have to compensate for the automatic richening effect 
from the overshoot of the flap, which doesn't happen with the hot 
wire systems.

Martin

> If you have some time to experiment, you might try adapting
> a hot-wire air flow sensor. That I know of you would have
> to make the following modifications:
> 
> i)   amplify the output
> ii)  replace the original air temp sensor with a fixed
>      resistor.
> iii) the L-jet flow meter has built in contacts to turn on
>      the fuel pump relay so you'd have to take care of this
>      some other way.
> iv)  Hot wire flow meters have a circuit to REALLY heat up 
>      the wire and burn off dirt and deposits. If I remember 
>      right this happens when you shut the engine off. You'd
>      have to get some info on that.
> 
> I was trying to find a schematic of a hot wire flow sensor
> that I took to pieces once. No luck! If I do find it I'll
> email it to you.
> 
> regards,
>  Walt
> 
>  
> 
> 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
>