[alfa] RE: using bimmer afm's on our 6 cyl alfas

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

Stretching the small hose will restrict airflow.   Been there, done that.
Adding the 3" air tube made a world of difference, albiet up top.   The BMW
AFM puts out the exact same voltage as the stock Alfa AFM as do all the
AFM's on Bosch mass air systems.   Turning the wheel up doesn't require any
complex calibration.   It takes an AFR meter or VOM to get you to stoich if
that's where you want/need to be for emissions or 12:1 for a high
performance application.  The wheel method has been recommended by trusted
Alfa people like Storhok and Steck so I'm pretty confident it's the best
compromise of ease and performance.

The L-Jet box just isn't worth messing with when something home-buildable
like a MegaSquirt is cheap and requires less electronic skill than trying to
reverese engineer the L-Jetronic.   And you get to lose the AFM completely.
It's easier to set up an Alpha/N system on a V6 than a speed/density.
Almost a requirement when you have high overlap cams like I do and it idles
like a dragster.

The Megasquirt info is at http://www.bgsoflex.com/megasquirt.html.  Build it
yourself for $100.  Don't pay high prices from vendors that try to pass this
off as their own creation.  Bowling and Grippo have a wonderful design.

-Peter


> -----Original Message-----
> From: dsedon@domain.elided [mailto:dsedon@domain.elided]
> Sent: Sunday, October 26, 2003 11:45 AM
> To: webb.p@domain.elided
> Cc: gmgraves@domain.elided; alfa-digest@domain.elided
> Subject: re: using bimmer afm's on our 6 cyl alfas
>
>
> peter, & all,
>
> ya won't defeat the purpose of the bmw afm w/stretched stock hose
> - *if* ya also use the bmw's intake piece, w/the ~37% larger
> (taller) intake opening,    then modify the top of the stock
> airbox lid, so it covers the bmw's afm intake.  a machine shop
> did mine up for $70; if ya have the equipment, this would be an
> easy diy.
>
> personally, i'd rather use the stock lid, w/the taller bmw afm
> intake opening blocked off, (the bottom two screws line up
> perfectly w/the stock airbox), than using a cone filter w/three
> inch opening, unless it's shrouded to get cool air from outside
> the engine bay.  (remember the similar discussion of stock airbox
> vs webers for the 4-cyl alfa's?)  i'd imagine that making a good
> shroud for outside air would be a *lot* more difficult than
> modding a stock airbox lid.
>
> on my 3.0 gtwe6, i ran my bmw afm w/the intake blocked of for a
> couple months, before i found a second airbox lid to modify, &
> even thus restricted, the throttle response improvement over
> stock was definitely worthwhile.
>
> ymmv,
>
> doug s.
>
> =====================
> 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.
>
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