Has anybody fitted one of these filters? I ordered one the other day and just wondering people's thoughts, in particular the thoughts of those who map these cars as that's my next step I'm thinking of heading to bell autos in York but haven't spoke to them yet.

Cheers, Tads

from looking at Def2 forum BAS certainly don't rate K n N filters Sophie Alltoft

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duckworthparts wrote:

from looking at Def2 forum BAS certainly don't rate K n N filters

http://www.defender2.net/forum/topic21125.html Sophie Alltoft

Send a paypal payment direct using this link www.paypal.me/duckworthparts

www.duckworthparts.co.uk
My Direct Line: 01673 849873
Email: danroberts@duckworthlandrover.co.uk
Supplier of Genuine Land Rover & Jaguar Parts For All Models

Can also supply OEM & Aftermarket parts

Ive run a K&N in the Discovery (both) and Defender (both) for ages - probably 15years, maybe 10/12...but no problems, rate them.

I service it every year (i have the kit) it saves on the filters and means i can keep it clean if i want (although it has its own service life).

I wouldnt say there are any performance increases (there might be - but i dont notice any) they have performed fine for years for me. Mike

2014 Facelift Discovery

TaddyHST wrote:

Has anybody fitted one of these filters? I ordered one the other day and just wondering people's thoughts, in particular the thoughts of those who map these cars as that's my next step I'm thinking of heading to bell autos in York but haven't spoke to them yet.

Cheers, Tads

Re. fitting a non-standard induction filter:

After sad tales of blown turbos in TDV8s I've been researching reasons for turbo failure and a common one is apparently interfering with the standard air intake system. Anything you do that might influence air flow into the engine can affect the pressure in the induction side and potentially cause turbo failure. Any tiny bit of debris from an air filter entering the system - can cause the turbo fan blades to disintegrate. Also any oil escaping from this kind of filter can contaminate the MAFF sensors and affect engine fuelling.

Additionally - over the years every investigation I've seen into the claimed benefits of these filters on standard engines has shown them to be bogus.

It's up to you but personally I wouldn't do it.

Apparently same goes for fitting free-flowing exhausts. The changed back pressure can cause turbos to overboost. 2008 MY Java Black TDV8 HSE

To do a fair test, to really make sure the K&N is not helping you have to do proper science and look at all variables and no way anyone on a forum will. I mean extremes like controlling all the factors and running two identical engines of known values. You could say that someone fitting a K&N already was likely to want something from it and this could have already been putting the pressure on turbos and increasing their likelihood of failure. etc etc

I wouldnt fit one to my sport - mainly because its under warranty, plus im not sure with more modern engines the issues are the same as older more simple engines.

I dont think K&N are actually that bad and that extreme a modification (like putting something in your oil) or those silly hiclones to spin the air (although defenders have them as standard )

But i do think they have a place and lots of people use them...the oil is harmless - i certainly didnt see any deposits from it when i looked...i think people are sometimes too cynical (like supaguard or car wax).

Fit one for the right reasons Mike

2014 Facelift Discovery

Thanks for the info guys, with looking at those graphs ile be sticking with the oem filter as there's clearly no reason to change it. Strange how some cars really benifit from after market filters and others go crazy with them, all well

Should I not even mention de cat options then????

Paddi wrote:

TaddyHST wrote:

Has anybody fitted one of these filters? I ordered one the other day and just wondering people's thoughts, in particular the thoughts of those who map these cars as that's my next step I'm thinking of heading to bell autos in York but haven't spoke to them yet.

Cheers, Tads

Re. fitting a non-standard induction filter:

After sad tales of blown turbos in TDV8s I've been researching reasons for turbo failure and a common one is apparently interfering with the standard air intake system. Anything you do that might influence air flow into the engine can affect the pressure in the induction side and potentially cause turbo failure. Any tiny bit of debris from an air filter entering the system - can cause the turbo fan blades to disintegrate. Also any oil escaping from this kind of filter can contaminate the MAFF sensors and affect engine fuelling.

Additionally - over the years every investigation I've seen into the claimed benefits of these filters on standard engines has shown them to be bogus.

It's up to you but personally I wouldn't do it.

Apparently same goes for fitting free-flowing exhausts. The changed back pressure can cause turbos to overboost.

"Please explain in detail how the fueling changes from a clogged up MAF would affect turbo blade life before some other engine internal had an issue. Also please share your experience with debris size versus blade life, as its something I am keen to hear about"

Answer to your first question is that's not what I said.

Answer to second is that I was using the term 'researching' to mean reading around the subject. The most useful sources were the technical website pages of turbo manufacturers and specialists such as TurboTechnics for example and all of them recommend the highest standards of intake filtration as contributing positively to turbo longevity. Ingestion of any debris is given as a cause of compressor destruction and a common source is foreign bodies like pine needles or leaves left in the filter housing when changing the filter. Another common mistake is using jointing compounds on the exhaust side during turbo replacement when any excess on the inside can break off and be drawn into the turbo. 2008 MY Java Black TDV8 HSE