RE: [alfa] Re: alfa-digest V9 #899

["Peter Webb" <webb.p@xxxxxxxxxxx>]

George et al,

You'll defeat much of the purpose of the BMW AFM by stretching the stock
hose.  The BMW AFM has a 3" inlet and outlet.   The Alfa has a 2.5" outlet
to a 3" throttle inlet.   That little input from the air box, even bored out
with a Dremel creates restriction too.   You can get a generic 3" air tube
and a 3" K&N cone filter to use the maximum airflow of the BMW AFM.

Using the CO screw doesn't do nearly as much as turning the black wheel in
the AFM spring.   It's under the black cover where the wiring harness plugs
in.   It's marked .017 throughout the wheel.   Turn the wheel
counterclockwise to enrich (loosen) the spring.   Use an AFR meter or VOM
off the O2 sensor to see when you have it right.  Best to hook one up in the
car to see how it behaves under load as well as idle.

I got mine through Illinois emissions with a little tweaking. They test on
the chassis dyno through the rev range, not just an idle test.  If you leave
the cap loose, you can adjust at the track and such.  I also installed an
adjustable FPR to get a little more out of the wimpy 183cm/3 injectors.  At
60 psi rail pressure, they run about 210cm/3 (20 #per hour).  I only do this
for the track to save my cats.

You can see my installation at
http://home.comcast.net/~webb.p/verde/index.html

Bosch part # for the AFM is 0 280 203 011.   The injectors for the same year
will also help.  Bosch part # 0 280 150 201 (236 cm/3) @ 42psi rail, 80%
duty cycle peak and hold.  These are the low-z 2.3 ohm injectors needed for
the L-Let, often called grey-tops.

-Peter


> -----Original Message-----
> From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided]On Behalf Of
> George Graves
> Sent: Saturday, October 25, 2003 12:13 PM
> To: alfa@domain.elided
> Subject: [alfa] Re: alfa-digest V9 #899
>
>
> In all of the early 12-valve units, it IS possible to use the AFM from
> a 6-cylinder BMW of similar vintage because they both used the  Bosch
> L-JetTronic F.I. system. All you really needed to do was soak the
> Alfa's rubber inlet boot in boiling water to stretch it over the larger
> BMW AFM outlet and then using an air/fuel meter adjust the airflow
> screw on the AFM for best results. But in the early nineties, and
> certainly by the time the 24-valve Alfa engines came out, the switch
> had been made to the Bosch MoTronic system and I'm not sure that the
> BMW and Alfa Romeo AFMs are compatible anymore.  Anyone know for sure?
>
> George Graves
> '86 GTV-6 3.0 'S'
>
>
>
> On Friday, October 24, 2003, at 09:05 PM, alfa-digest wrote:
>
> > Date: Fri, 24 Oct 2003 22:45:51 +0100
> > From: "Tim Hancock" <timhancock@domain.elided>
> > Subject: [alfa] AFM Alternatives for 164 24V ?
> >
> > I need an AFM for the 24 Valve, and I thought I had a spare one, but
> > apparently not. They are quite difficult to find secondhand in the UK
> > and I
> > wondered if there is a substitute AFM I could use. I have heard of
> > some BMW
> > units being suitable, but I have no idea which. If anyone can fill in
> > the gaps
> > in my knowledge I would be very grateful to know if there is another
> > AFM I can
> > go hunting for.
> >
> > The car is now quite close to MOT test standard and its very
> > frustrating when
> > things like this rear their head at a late stage. It a curious thing,
> > but I
> > have the last emissions test data for the car when it was running 18
> > months
> > ago, and it passed. For some reason the o2 sensor has given up during
> > its laid
> > - -up period as the Co figure was way out, but restored with a new o2
> > sensor
> > installed.
> >
> > Tim Hancock    Boston UK
> >
> > 164TS
> > 164 Super
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