Do I need an Air Flow Meter?

[P.J.Berg]

Montebello, eh! Thats the name of a place close to me here in Oslo Norway.
:o)

J.



P.J.Berg
BergRace at Aircooled.net





----- Original Message -----
From: "James Montebello" <jamesm at lapuwali.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, December 04, 2000 6:10 PM
Subject: Re: Do I need an Air Flow Meter?


> On Mon, 4 Dec 2000, Bruce Plecan wrote:
>
> >
> >> You mention that I would probably need a sensor for barometric
pressure,
> >> air temp, and RPM.  The stock AirFlow Meter doesn't have any of this.
> >
> > Doesn't have to, it's figuring mass
>
> Just picking a nit, but the Bosch "flapper-type" airflow meters (as the
> original poster was asking about) do have an air temperature sensor built
> into them, and provide it along with the flapper position.  The later
> "hot-wire" type of airflow meters are themselves temperature sensitive,
> so ambient temperature is accounted for automatically.
>
> To the first poster, if you know airflow correctly, you don't need to
> know engine speed.  Bosch K-Jet doesn't have an engine speed input.
> It does usually have some input related to the throttle position
> (depending on the type, this is either a MAP reference, or a TPS).
>
>
> > Just too hard in my opion to get enough resolution in using just a MAP
to
> > do it. Hard to tell at times if your actually doing what ya seem to be
> > doing because of Baro.
>
> I would think that MAP would be directly related to barometric pressure,
> since lower barometric would automatically mean lower MAP for otherwise
> identical conditions.  Since you want less fuel at altitude, and you'd
> get a lower MAP value at altitude, a fuel curve matched to MAP, with
> throttle compensation for acceleration, would be adequate.
>
>
> It's funny how many people are suddenly showing up wanting to replace
> airflow meters with MAP output.  I'd thought about doing exactly the
> same thing to by L-Jet equipped Alfa.
>
> james montebello
>
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