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Thread: Can anybody tell me..........

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    Regular Member KeefyB's Avatar
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    Default Can anybody tell me..........

    wot the air box mod is and wot gains are to be had. Also does any body know where i could get a half leather interior from, ive already checked ebay. cheers

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    Regular Member Keithy's Avatar
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    Regular Member Handyandy-UK's Avatar
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    Vehicle : BMW 525i

    Trim : SE Touring

    Engine : 3.0

    Year : 2007

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    The Airbox 'mod'

    In the lower section of a Vectra C air filter housing you will find a detachable guide section of the air inlet trunking.
    If you look at the standard paper air filter element of an Vectra C (which has done a few miles) which still has this section fitted, you will see that only one section of the filter element appears to show blackening/contamination.
    Popular practice is to remove the detachable section so as to allow a less restricted airflow into the lower section of the air filter housing, with the intention of permitting an improved airflow through a greater surface area of the filter element thus permitting 'improved breathing' of the engine.
    In practice an air filter housing without the detachable guide section fitted will show a standard paper filter element with far more evenly distributed blackening/contamination, thus displaying that the incoming airflow is far less restricted than with the detachable section in place.
    Commonly felt 'improvements' include a smoother running engine, faster pickup (engine response to throttle input) and reduction/elimination of flatspot (particularly in deisels).
    A common addition to this 'mod' is the replacement of the standard paper air filter element with a 'fabric'type filter element such as manufactered by K&N.



    (I've spent far too many years dealing with MoD tech pubs )

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    Regular Member SRIRob's Avatar
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    Ill be doing this today, did it on my Astra SRI and did feel the difference

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    Quote Originally Posted by Handyandy-UK View Post
    ..........(I've spent far too many years dealing with MoD tech pubs )
    Ahh yes, good old EMER's. I remember them well
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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    Regular Member Handyandy-UK's Avatar
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    Quote Originally Posted by GARY3306 View Post
    Ahh yes, good old EMER's. I remember them well
    AESPs are proving about as much fun..... APs will NEVER make sense to me !

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    I am wondering what the purpose of this guide section in the airbox is. Is it purely to reduce noise or (looking at the shape) would it increase airflow speed? On my 2.2 I have also removed this section but it seems I am now getting less MPG.

    Jaap
    Last edited by jaap; 3rd January 2010 at 13:02.

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    Regular Member nokiaman1978's Avatar
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    think it was to improve motorway mpg at speed but around town you should now see a difference in mpg as in increase, when i done mine it reduced the flat spot greatly and smoothed out the torque boost, still to try an aftermarket filter as well. Also is your car full canbus if so it will auto learn change to airbox after a good few miles and then you will notive the diff. If not you will need to reset th ecu.

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    Quote Originally Posted by jaap View Post
    I am wondering what the purpose of this guide section in the airbox is. Is it purely to reduce noise or (looking at the shape) would it increase airflow speed? On my 2.2 I have also removed this section but it seems I am now getting less MPG.

    Jaap
    give it a few miles mate,, when I took the trumpet out and fitted a fram air filter I had quite a drop in mpg, but am now getting more mpg than before, I think the ECU took a while to adjust on my car, some say to remove the battery lead to re-set the ecu. in my car its smoother, quicker pick up and generaly better to drive. but have not done a long Mway drive ,,yet

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    Regular Member yadziyad's Avatar
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    how do you reset the ecu

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