stchris356

Performance air filter

27 posts in this topic

56 minutes ago, stchris356 said:

Does anyone know if there is a performance air filter available for the 530d (the chain guard shaped one)?

 

Thanks

Chris

 

Never seen one anywhere and can't imagine, if there was one, you'd get any benefit as the stock one has such a large air intake area. 

Do these performance filters actually offer any real world performance value?

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49 minutes ago, Matthew Ashton said:

Do these performance filters actually offer any real world performance value?

 

Well there is a massive market for them and they do give more of an induction noise. I toyed with the idea of a K&N filter on my last E60 so it sounded a bit beefier, as being German it lacked a certain burble normally associated with V8s. 

 

But as they are very much engine bay mounted almost directly onto the MAF, they suffer from hot air as the manufacturers air box and ducting has all been removed to get it in. Thus I think any gain in cancelled out due to not getting cold air.

 

I'm not in general favour of bolting on go faster bits, I would rather have a bigger engine/output to start with.

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Andrew - Do you have to buy new bolts when fitting a new air filter? I've never done mine myself but theres 2 stretch bolts holding the bar across the top of the air filter and a label saying they are single use. I've toyed with the idea of a performance filter but having to buy bolts puts me off (they aren't expensive I'm guessing but it's more the annoyance of having to buy them!)

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40 minutes ago, sanjx said:

Andrew - Do you have to buy new bolts when fitting a new air filter? I've never done mine myself but theres 2 stretch bolts holding the bar across the top of the air filter and a label saying they are single use. I've toyed with the idea of a performance filter but having to buy bolts puts me off (they aren't expensive I'm guessing but it's more the annoyance of having to buy them!)

 

If you are talking about one of the 4 under Bonnet cross braces the bolts should be replaced once loosened as they are stretch bolts like you said. However, this is what I was expecting when BMW replaced my aircon condenser as the front braces need to be removed but they didn't. Whether they even torqued the bolts properly is questionable. I also removed one of the braces when I removed the aircon blower and never did replace the bolts there either. Probably not ideal but I made sure the bolts were tightened per spec and I check the torque value regularly. I don't do the additional angle tightening as the bolts have stretched already so there is no point. 

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I'm a veteran of airbox mods: petrol NA engines, rather than diesel.  Gains sometimes placebo - but sometimes not.

 

My set-ups have been:

  • 'Swiss cheese' airbox mod.
  • Drop-in panel filter
  • Open cone
  • Open cone with heat shield
  • Cowl induction with closed carbon fibre set-up

Best gains on the final mod: but God knows what a turbo diesel would do with more cold air...

 

Actually, cowl induction with advanced timing and long-reach plugs worked well for me.  Good for, like, 5hp.  So - worth the 100's pounds investment.  :huh:

 

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I ran two different drop-in filters in my old E36 M50 - an ITG foam filter and then a K&N. With the K&N, there was a slight increase in induction noise which I liked, and in really hot weather I'm sure it lost less performance than with the standard paper filter. This was over a period of several years, no MAF issues at all. I'd quite like to fit a K&N to my current car, but they are not cheap (more than £60) and I can't really justify it.

Edited by Tuvoc
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Re stretch bolts. For critical applications like primary suspension joints, yes I've always replaced them, but I have yet to replace bolts that hold a caliper cradle to a hub which I think you are meant too.

 

A strut brace you could argue is a secondary suspension component and like Matthew says, I don't think BMW replaced the lower strut to hub bolt when they replaced a rear spring on my F10 nor did they replace bolts when they did my air con condenser. 

 

However if you check the fixings regularly as per Matthew's advice, I think you will find that reusing them will be o.k.

 

17 minutes ago, Tuvoc said:

 I'd quite like to fit a K&N to my current car, but they are not cheap (more than £60) and I can't really justify it.

 

I don't think a standard genuine paper air filter for an F10 is much less than your £60 by the time it's opened from its BMW box and fitted by a BMW tech when it's in for a service.

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When i had my car serviced last i asked for a breakdown and the BMW specialist were very reasonable on the pricing. Until it came to the replacement of the air filter which they wanted £80 for!! 

 

I politely declined the filter swap and did that myself.

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I always wonder about 'performance' air filters. If this means letting more air through, which it usually does, then the holes in the filter have to be bigger. The bigger these are the more dust can get through as well, so why would you do that?

If the filters draw in underbonnet air as well, then there will be a reduction in performance, as hot air is less dense than cold, and is therefore less rich in oxygen, so the whole exercise is a waste of time and money.

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Thanks gents, i might ask BMW when i'm next in for a price for the bolts just to see what they cost. May even be surprised to find that they are £1 each but doubt it. 

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A drop-in panel filter in the standard airbox obviously doesn't let in underbonnet air. It isn't about bigger holes, it is paper vs foam vs cotton gauze - different materials that filter differently. But yes more air means potentially more dust, but then again there are big dust particles and small dust particles etc. The replacement filters will let through more tiny dust particles as a consequence of the greater airflow, but is that going to significantly shorten the life of the engine ?  That is the big question but personally I think not.

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i would just use normal filters. don't forget performance filters are coated with oil which need regular "re-oiling", and the oil itself in some cases can cause MAF sensor issues.

 

This is the exact same air filter BMW will give you, but without the price markup: http://www.opieoils.co.uk/pv-143229-mahle-lx3598-air-filter-genuine-part-bmw-5-7-series-20-30-single.aspx

 

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1 hour ago, sanjx said:

Thanks gents, i might ask BMW when i'm next in for a price for the bolts just to see what they cost. May even be surprised to find that they are £1 each but doubt it. 

 

I think the bolts for the rear crossbraces are M10 x 47 part number: 07147029829 and retail at £3.70 each

Edited by Matthew Ashton
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1 hour ago, IINexusII said:

i would just use normal filters. don't forget performance filters are coated with oil which need regular "re-oiling", and the oil itself in some cases can cause MAF sensor issues.

 

This is the exact same air filter BMW will give you, but without the price markup: http://www.opieoils.co.uk/pv-143229-mahle-lx3598-air-filter-genuine-part-bmw-5-7-series-20-30-single.aspx

 

 

The MAF myth:

 

https://www.knfilters.com/news/news.aspx?id=422

 

"If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it’s not true. K&N has researched, tested and devoted many hours to confirm the use of K&N Air Filters, including over oiled air filters, will not cause a Mass Air Flow sensor failure under any remotely normal driving conditions. Oil does not come off K&N Filters."

Edited by Tuvoc

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Fair enough. I just don't think it's of much benefit on diesel applications from my experience

 

Sent from my Nexus 6P using Tapatalk

 

 

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9 minutes ago, IINexusII said:

I just don't think it's of much benefit on diesel applications from my experience

 

I think you are hitting the nail firmly on the head sir!

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7 hours ago, SuperDave said:

Has the airbox moved on the later 530d engines? Mine was a few minutes to change, no strut removal for sure. 

 

The Question about the brace removal was for the N53 petrol engine. The 530d engine cover didn't change between revisions of the N57 so the cover is as easy as ever to remove. 

Edited by Matthew Ashton

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11 hours ago, IINexusII said:

i would just use normal filters. don't forget performance filters are coated with oil which need regular "re-oiling", and the oil itself in some cases can cause MAF sensor issues.

 

This is the exact same air filter BMW will give you, but without the price markup: http://www.opieoils.co.uk/pv-143229-mahle-lx3598-air-filter-genuine-part-bmw-5-7-series-20-30-single.aspx

 

That's good to know, that's where i got mine from :) 

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Erm - can anyone send me a link to a K&N filter panel replacement for my 2011 520d Deficient Dynamics?  I can only see one for the 2010 model.

 

Just looking of course.  I've learnt my lesson.  Oh yes.  Oh...yes.

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Performance air filter

Hmm technically there is no such thing!

 

If you work on the assumption no air filter = max throughput then any form of filter = a restriction. 

In the real world of forced induction engines it all becomes a bit irrelevant. Providing the induction tract is not significantly obstructed

 

I ran 400BHP at the wheels via a 9 psi blower through a stock air filter fed by what looked pretty much like a piece of gutter down pipe, still stock though,

The restriction on power for that particular car was not induction capacity or boost but the max torque the gearbox could take without tearing itself to bits!

 

Some years earlier I had wanted to make my M47 powered Rover 75 go a bit better.

I was truly shocked how restricted the air intake ahead of the filter was. It had a tiny little slot with all sorts of junk in front of it including the bonnet cables

Opening up the intake made a significant difference and aided other mods like larger inter cooler and remaps for a higher fuel flow rate.

 

It always cracks me up when numpty boy racers spend silly money and actually cause the engine to produce less power by adding aluminium and pretty silicon hoses under the bonnet - typically badly thought out amateur bling.

 

If I had done that on my V8 the alloy heat soak in the induction tract would have heated the incoming air significantly ruining the point of the inter-cooler and we all know hot air is less dense so can carry lower fuel air charge hence less power.

 

Sometimes the stock plastic abomination is far more efficient! especially when combined with a better inter-cooler but people like their visible bling.............

 

 

Edited by Alexak
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12 hours ago, Dr Taylor said:

Erm - can anyone send me a link to a K&N filter panel replacement for my 2011 520d Deficient Dynamics?  I can only see one for the 2010 model.

 

Just looking of course.  I've learnt my lesson.  Oh yes.  Oh...yes.

 

 

Performance replacement air filter for a 520d, isn't that called a 530d? :P

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As above, upgrading to a 530d is the only way to get more performance other than a remap :)

 

There doesn't seem to be a filter for the oval-dome shaped filter on the N47/N57 engines on the K&N website.

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