2002 E46 325ti Compact - Induction kit question

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  1. 2002 E46 325ti Compact - Induction kit question 
    #1
    Dr of BMW
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    Diablo944's Car Details
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    Here goes nothing. I am driving a 325 ti compact sport that has a K&N induction kit fitted. The original airbox and ancilliaries are all in a cardboard box. My question relates to the item of kit below the induction kit and what it is, along with whether there are any detrimental effects to its no longer being involved in the food chain.

    The old/original fitment pipe had an additional vertical pipe about 5 inches long coming out through the bottom of the feed (around 2 inches from the MAS) and going to a metal box. The rear of the metal box then opening into the empty area behind the suspension strut (why dont they have the battery in this area by the way? seems more logical than having it in the boot? unless balance is an issue?)

    Anyway. My main questions here are:- What is this (now excluded) component? Is it's disconnection from the chain of airflow important or does it still do something regardless of its being left out in the cold? and finally, why does the induction kit dismiss the components fitment? Basically, I am worrying that it may be something important that is being ignored.

    I have included a picture of the original pipework showing where it would have fitted (the vertical pipe is still in situ in the vehicle so isn't visible here) along with a diagram of roughly what I am talking about. The only image I have of the engine bay at the moment doesn't show the pipe unfortunately, but I have included it in case it jogs someones memory.

    Trawling the web found me nothing, and asking a dealer isn't something that comes naturally (probably charge me 50 quid for just saying hello), so I throw it to the knowledgable masses of the forum and hope you guys can help.

    Sorry the pictures are so large. No software on this pc to resize them.


    Last edited by Diablo944; 16-03-2009 at 04:42. Reason: spelling errors
     
     

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    #2
    RYM
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    I have moved this thread to the tuning section where it will receive the required attention
     
     

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    would it help if I said please? anybody? what is it? or do I need to photograph the part in situ to show it better? First person with the answer gets eternal thanks for giving me peace of mind. Looking at the amount of people who do fit the kits, this could be important to a lot of people if the part is on others in the range.
     
     

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    I will PM a man who I think may know the answer
     
     

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    Quote Originally Posted by Diablo944 View Post
    would it help if I said please? anybody? what is it? or do I need to photograph the part in situ to show it better? First person with the answer gets eternal thanks for giving me peace of mind. Looking at the amount of people who do fit the kits, this could be important to a lot of people if the part is on others in the range.
    Please post a picture of it and I will ID it for you.

    Not sure exactly what part you are describing so a picture will do the job
     
     

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    and its a MAF by the way

    Mass Air Flow *sensor*

    Old style ones are called AFMs - Air flow meters

    Some turbo cars dont have MAFs but instead use a MAP sensor (manifold absolute pressure) instead.

    Just a titbit of info there
     
     

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    RYM (18-03-2009)

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    That is a photo of the original throttle body hose and as Boostist correctly says, connects to the MAF.
     
     

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    RYM (18-03-2009)

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    is there a difference between a mas and a maf? One sensor is connected on the replacement K&N kit at the end nearest the filter. thats what the two jubilee clips are holding in place with the large rubber enclosure.

    My concerns relate to the component beneath the whole k&N setup. The plastic box and vertical pipe are no longer connected to the air feed. the pipe may look connected in the pic, but it isnt, it stops below the plastic of the K&N plasticwork.

    It looks like the K&N boys thought it was superfluous, and the car goes well without it, but it still worries me not knowing what it is and whether its actually important.

    My camera went flat just as I was about to take extra pics, but the plastic unit highlited with an X is the one I am talking about, there is something in it, but I have no idea what its function is. The rear most part opens into an opening around 1 inch circular into the empty bulkhead space.
     
     

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    Although I stand to be corrected on this, as far as I am aware changing the length of any pipework before the MAF (ie between the filter and the MAF) has no effect on its operation.

    So you can adjust the pipework in order to place the induction kit wherever you like, however the MAF itself cannot be moved unless of course you are removing it to replace it with a MAP sensor but that's another question entirely
     
     

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    #10
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    Am not worried about the maf that is in the pipework as it is where it should be (kind of figure that as long as it is in the pipe somewhere, the airflow wont be any different). Its the second box with something metallic going on in there that is located below the induction kit that is the issue. Did it do anything important? there isnt a lot of room down there to chase things around, and it is only the fact that it is now no longer connected to the feed that is worrying.
     
     

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