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Thread: Induction kit and Air filter

  1. #1
    Regular Member Danialj32's Avatar
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    Default Induction kit and Air filter

    Are they really worth the money? Was looking for some feedback on people who've got these on their cars, was looking at the K&N ones, but they're quite pricey! Would I see an increase in MPG? More BHP? Noise?

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    Regular Member nokiaman1978's Avatar
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    i'd like to know the same would a k&n filter really make that much of a difference to my 150 cdti.

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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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    This is a question area that seems to pop up quite regularly on here. I can't sit here and state proven facts regarding performance - all I can say is that my 3.2 GSi felt a little more 'nippy' to me once I'd had a K&N panel filter fitted for a week or two.
    But even if you forget the whole performance side, you have to look at the economy side :
    Normal paper element filter costs something like £20 and you change that once a year.
    K&N panel filter costs about £45 and doesn't need cleaning for about 50,000 miles - whereupon you re-use it.
    So unless you're doing in excess of 100,000 miles a year, the K&N panel filter is ahead just on costs alone.

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    Regular Member nokiaman1978's Avatar
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    will i need to reset ecu after fitting k&n or will it adapt to the filter.

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    Regular Member nokiaman1978's Avatar
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    also if it letting more air through will it not filter less of the crap into the engine

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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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    Quote Originally Posted by nokiaman1978 View Post
    will i need to reset ecu after fitting k&n or will it adapt to the filter.
    You can happily just remove the paper filter and replace with the K&N, close the box and drive away.... the ECU will adapt to the changes.
    Just the same you can also disconnect the battery, remove the paper filter, replace with the K&N, close the box, wait for the rest of an hour or so the reconnect the battery. The ECU should by then reset with it's default values and begin adapting from there.
    You don't NEED to reset the ECU but many people prefer to.

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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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    Quote Originally Posted by nokiaman1978 View Post
    also if it letting more air through will it not filter less of the crap into the engine
    No - when car manufacturers build their cars they're looking at the cheapest service parts that will safely do the job, but still require replacing at given intervals - they can therefore charge the customer for parts and labour, thus making dealership maintenance a profitable franchise to offer.
    If K&N and other mnaufacturers openly sold products that weren't as good as the cheaper originally fitted items, they wouldn't be in business too long.

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    Regular Member Danialj32's Avatar
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    I drive a 2.2 LS, would I see much difference with the induction kitand air filter from k&n?I was always told that vauxhall chose the current air filter because they thought it was the best for the car, but you're saying they choose the cheapest?

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    Regular Member Jezzy's Avatar
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    Here's my opinion: When I fitted my K&N panel filter, the engine sounded like it was breathing more easilly, and revved more enthisiastically. However, fitting an induction kit is a different matter, as they suck in hot air from inside the engine bay, whereas keeping an airbox means all the air passing through the filter is from outside the engine bay.

    As for whether the standard paper filter is better than a K&N, no it isn't. It's obviously a cost-cutting measure, the same way fitting 285mm front disk brakes to the 4-cylinder diesels and the 2.2 petrols is a cost cutting measure by Vauxhall/Opel. Fitting the 302s or 314s to all Vectra would make the cars safer, but it's not done due to reasons of cost.

    Look at it another way: why are all the hoses in the engine bay made of rubber rather than silicone? Cost, not because rubber ones are the best available.

  10. #10
    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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    Quote Originally Posted by Danialj32 View Post
    I drive a 2.2 LS, would I see much difference with the induction kitand air filter from k&n?I was always told that vauxhall chose the current air filter because they thought it was the best for the car, but you're saying they choose the cheapest?
    They chose the cheapest that still fulfils their requirements.

    Short of putting your car on a dyno before and then again after fitting a K&N filter, only you can decide the performance difference.
    As Jezzy mentioned, replacing the airbox with an induction kit will most likely not be such a good idea - the airbox is supplied with air from 'outside' the car which is generally cooler - cooler air is more dense and therefore you get more bang for a given volume of air drawn into the cylinder.
    An induction kit will draw air from 'inside' the engine bay which will rapidly become warm air - less dense - less bang.... you get the picture.

    If it were me, I would remove the insert from the base of the airbox (airbox mod) and replace the paper filter with a K&N panel filter. Actually, that's exactly what I've done

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