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

[dsedon@xxxxxxxxxxxx]

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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