High Flow Air Filter
- Thread starter sumotan
- Start date
Attleborough, Norfolk
I have KN on my 23i. Had about 5-6 years now. I did go back and try a Bosch, but the car felt draggy on acceleration, so went back to KN.
I do clean it every 6 months with the absolute minimum of reoiling. In fact i make a fuel/oil mix so that only a thin film of oil is left behind. I also clean the maf sensor with cleaner.
I do clean it every 6 months with the absolute minimum of reoiling. In fact i make a fuel/oil mix so that only a thin film of oil is left behind. I also clean the maf sensor with cleaner.
A
Anonymous
Guest
General consensus from several forums /articles is that modern air boxes and high quality OE type filters are the way to go.
Several tests have shown little if no real improvement in performance using the K+N type filters and the level of particles passed by these filters is excessive and when associated oil analysis tests have been done show high levels of silicon (ie dirt) in the oil.
I know this flies in the face of 40+ years of K+N marketing but I did have a very good look at this from three different vehicle perspectives and that was the summary data..
So Mahle, Mann, Wix filters come out well..
Several tests have shown little if no real improvement in performance using the K+N type filters and the level of particles passed by these filters is excessive and when associated oil analysis tests have been done show high levels of silicon (ie dirt) in the oil.
I know this flies in the face of 40+ years of K+N marketing but I did have a very good look at this from three different vehicle perspectives and that was the summary data..
So Mahle, Mann, Wix filters come out well..
I agree with performance - original filter vs aftermarket filters, and with low power cars, it really notices a difference, I know that Pipercross filter gave my girlfriends 2014. 1.2 Fiat 500C a nice throttle response, and we are talking about the car with 69 HP. Having this same filter in the car with 200 HP, you will not notice any improvement but you will have a long term solution that you need to clean and that's it.
SV8Predator
Member
Pbondar said:
Your diagram (very impressive I must say!) is showing the results from one of your cars, or all three of them?
A
Anonymous
Guest
The chart was for filters for a Chrysler 4 litre engine as used in Jeeps.
I did quite a bit of research into alternative air intakes and filters for my E89..where the professional consensus was stock intake and stock filter yielded at least equivalent results. Some earlier cars did have some benefits to revised intakes more so with major mods.
Tyre reviews did a very good review on a M3 which showed little if any advantage to these mods.
K+N was never quite as good and worse when dirty..
The amount of dirt sucked in with K+N is my concern.
As someone who has fitted many K+Ns to many motorcycles and cars over the years its a bit of a let down.
When you look at the design of modern air boxes and the size and area of modern filters its not really suprising..IMHO
I did quite a bit of research into alternative air intakes and filters for my E89..where the professional consensus was stock intake and stock filter yielded at least equivalent results. Some earlier cars did have some benefits to revised intakes more so with major mods.
Tyre reviews did a very good review on a M3 which showed little if any advantage to these mods.
K+N was never quite as good and worse when dirty..
The amount of dirt sucked in with K+N is my concern.
As someone who has fitted many K+Ns to many motorcycles and cars over the years its a bit of a let down.
When you look at the design of modern air boxes and the size and area of modern filters its not really suprising..IMHO
I agree, I don't think there's any benefit with after-market filters or modified intakes as the stock filters aren't a restriction at all.
On the N54 people have removed the filter altogether and done testing that showed no noticeable increase even on tuned vehicles.
Even if the quoted power increases were true for these filters I still wouldn't use them, not worth the additional damage that the extra particulate matter is doing to the engine.
On the N54 people have removed the filter altogether and done testing that showed no noticeable increase even on tuned vehicles.
Even if the quoted power increases were true for these filters I still wouldn't use them, not worth the additional damage that the extra particulate matter is doing to the engine.