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Discussion Starter #1
hi,
my jcw airbox arrived today and i have a question before i fit it - there are 2 holes on the back fo the airbox (the end nearest the windscreen) the larger one being open but the smaller circular one being closed - is there any reason for this? - i would hae thought 2 inlet holes would be better than one!
sy
 

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M3 CSL
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724 Posts
hi,
my jcw airbox arrived today and i have a question before i fit it - there are 2 holes on the back fo the airbox (the end nearest the windscreen) the larger one being open but the smaller circular one being closed - is there any reason for this? - i would hae thought 2 inlet holes would be better than one!
sy

They all come with the lower smaller hole blanked off for some reason, just pop the blank out and then fit (only held in with the rubber).

I don't see why they would leave the blank in as that would mean you have less air than stock below 4.5k
 

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MiniTorque*****
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1,072 Posts
Defo boot it out, took both mine out and the electronic flab gubbins... love it! It's made a noticeable difference to my inlet temps over the open top Atla V2.
 

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Discussion Starter #4
re:

Defo boot it out, took both mine out and the electronic flab gubbins... love it! It's made a noticeable difference to my inlet temps over the open top Atla V2.
i've removed all the wiring, vacuum stuff etc. that operate the flap. from what i can tell there isn't a natural tight seal around the lower hole, there's a small gap,-a couple of mm, the rubber lining around the lower hole and the black casing that replaces the standard black separator - with just the lower hole, in the engine bay, the upper hole has a tight seal making good contact with the black casing. i'll probably get some rubber liner and glue it on to combat this. other wise, i would assume, it'll be drawing in a proportion of air from the engine bay.

my main concern was whether or not the pressure gradient across the airbox is affected with two holes - is that why mini covered the lower one?
 
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