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

[dsedon@xxxxxxxxxxxx]

hi pete, stretching the stock hose to fit the bmw afm worked fine for me - it's now 3", so no restriction!  ;~)  modding the top of the airbox lid to accept the bmw afm's much larger intake was a piece of cake, & i like getting outside (not from the engine bay) air into the engine...

thanks for the megasquirt link - i will have to inwestigate!

regards,

doug s.
===================
"Peter Webb" <webb.p@domain.elided> wrote:

>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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>

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