I am considering fitting the above air filer to my Nissan Tino 2.2 Turbo Diesel.Has anyone any experience with a Turbo Diesel. Do they improve consumption fuel economy acceleration etc. Any advice would be appreciated.
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you'l be lucky to see much improovement in power etc, however they are very good filters that save money after a while ecause you can clean em instead of replacing
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Your Nissan is fitted with an air flow sensor which will become contaminated with the oil which is in the filter material rendering it useless.
Consider this, why would Nissan spend hundreds of thousands of pounds developing an air intake system which effectively filters the air and quietens the induction roar when they could have fitted an oily cotton cone for a fraction of the cost......
I am the first to admit that on older engines, especially carburated race and performance engines K&N are my first choice where the oil contamination is not a problem and the superior airflow is needed (as on older vane type airflow meters or systems that use MAP sensors), but they can cause icing problems in cool weather and in my humble opinion have no place on modern engines.
Andrew
Simplicate and add lightness!!
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Diesels always run with an excess of air AFAIK: why would you need more? When I thought about changing the original paper filter on my TDI I contacted K&N and asked for references which backed up their power claims, in relation to diesel. When there were none forthcoming, I drew the conclusion that for diesel engines, the effects of a K&N were advertisers puff. Now it might be possible for a petrol engine, which runs at a stoichiometric steady state, but a rich mixture during acceleration, but even there I doubt it. As Andrew points out, there are downsides also.
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K&N are a waste of time on a Diesel (which is inherently 'lean-burn' anyway) and worse, as Andrew says, cause degredation of hot wire/film type AFM's. Just keep a clean filter in the box.
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i know a man who used a k&n in his diesal turbo and it didnt make a diff,in the cold it didnt start to well,in the warm was loss of performance,in the end it was down to halfords for replacement,since its been sweet as a nut.
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i sell 15 odd "performance" air fliters a week - k&n pipercross greencotton etc etc.
i agree that they make a bigger difference on carbs - and they do make a small, maybe unmeasureable differnce on cars with efi - but they do last a long time - k&n carry a million mile warranty. and ive NEVER had one come back. at the end of the day gas flow is restriced by the valves, ports, and injection setup. tha amount of air that a std filter can pass is usually plenty. the 2 differences made by performance fitlers is:
a vortex, the incoming air charge is "spun" thus making the fuel mixture more constant, and promoting better combustion
and a colder air charge - the colder the air, the more dense - therefore more power.
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I read somewhere the Foam filters from such as I think Pipercross are better, because they are easier and cheaper to clean that the K&N although they are equal on performance.
As for Diesels they may offer some improvements for the non-turbo's being a negative pressure like the petrols, but not for the turbo'ed ones as the air is pumped into the engine, in a positive pressure.
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