tlkchew
Well-Known Member
Re: How good K&N air filter??
Car Filter Review
found the link.. quite intresting.
APexi came out tops sorry...
Car Filter Review
found the link.. quite intresting.
APexi came out tops sorry...
How good K&N air filter??
- Thread starter bmw7833
- Start date
futron.sim
Well-Known Member
Re: How good K&N air filter??
IMHO, stock air filter is still the best but it gets dirty really fast compared to after market ones. Have to change filter often.
As for which is the best filter, I still like K&N the best but I am using hurricane now.
IMHO, stock air filter is still the best but it gets dirty really fast compared to after market ones. Have to change filter often.
As for which is the best filter, I still like K&N the best but I am using hurricane now.
desertfox65
Well-Known Member
Re: How good K&N air filter??
If it gets dirty it is doing its intended job very well imho . I checked the air filter after almost 1 year and 4months ,it is stock and so far it is still good.
If it gets dirty it is doing its intended job very well imho . I checked the air filter after almost 1 year and 4months ,it is stock and so far it is still good.
wt_know
Well-Known Member
Re: How good K&N air filter??
although K&N is able to pass more air compare to stock air filter, however, is there "more than enough air" in the stock airbox to be passed ?
the weakest link is the stock airbox that has a limitation for incomnig air. hence, any type of performance drop in air filter is not able to produce any gain not due to the filter but due to lack of incoming air through the stock air box.
am i right ?
although K&N is able to pass more air compare to stock air filter, however, is there "more than enough air" in the stock airbox to be passed ?
the weakest link is the stock airbox that has a limitation for incomnig air. hence, any type of performance drop in air filter is not able to produce any gain not due to the filter but due to lack of incoming air through the stock air box.
am i right ?
wt_know
Well-Known Member
Re: How good K&N air filter??
i will also do the air scoop. the big question now is after the air scoop, should i continue to use the stock air filter or K&N drop in. based on e90post discussion & dyno, stock air filter works equally good if not better than any performance drop in filter in stock airbox.
i will also do the air scoop. the big question now is after the air scoop, should i continue to use the stock air filter or K&N drop in. based on e90post discussion & dyno, stock air filter works equally good if not better than any performance drop in filter in stock airbox.
pengful;437410 said:
wt_know
Well-Known Member
Re: How good K&N air filter??
i wonder how many CUft of air/min could pass through the stock airbox that it exceeds the CUft of air/min of the stock air filter as the whole airbox and air filter was designed by BMW R&D
anyway, i will most likely get the K&N filter after installing the scoop hoping both will compliment each other for optimum performance.
i wonder how many CUft of air/min could pass through the stock airbox that it exceeds the CUft of air/min of the stock air filter as the whole airbox and air filter was designed by BMW R&D
anyway, i will most likely get the K&N filter after installing the scoop hoping both will compliment each other for optimum performance.
tlkchew;437431 said:
tlkchew
Well-Known Member
Re: How good K&N air filter??
even if stock air box does not have enough air, the filter will be able to "Suck" more air from the intake snorkel. so more air still passes through the filter.
dont hesitate anymore
change the stock filter, unless you feel that your engine will breakdown anytime soon, as PML may void warranty for using after market filters
wt_know;437338 said:
even if stock air box does not have enough air, the filter will be able to "Suck" more air from the intake snorkel. so more air still passes through the filter.
dont hesitate anymore
change the stock filter, unless you feel that your engine will breakdown anytime soon, as PML may void warranty for using after market filters
tlkchew
Well-Known Member
Re: How good K&N air filter??
pretty sure there is more air taken in then stock filter!
I am predicting your next question, here... "then why not put in a open pod filter ?" alot more air..
in this case, there would be too much air if you do not have other parts moded. like the Fuel pressure, exhaust... you cant just have intake without openning up the exhaust.
hope this helps! so which filter you getting? hurricane or K&N? i personally would go for hurricane. coz its zero maintenance and found to be reliable and have not seen any failure of the MAF , but hurricane does not have for my car :twisted:
So sticking with K&N and have not regretted.
Some users of k&N filters over oil after they wash their filter causing dust particles that "un-sticks" from the filter to stick to the MAF sensor.
but its a simple fix to clean it by the mech.
cheers!
wt_know;437434 said:
pretty sure there is more air taken in then stock filter!
I am predicting your next question, here... "then why not put in a open pod filter ?" alot more air..
in this case, there would be too much air if you do not have other parts moded. like the Fuel pressure, exhaust... you cant just have intake without openning up the exhaust.
hope this helps!
so which filter you getting? hurricane or K&N? i personally would go for hurricane. coz its zero maintenance and found to be reliable and have not seen any failure of the MAF , but hurricane does not have for my car :twisted: So sticking with K&N and have not regretted.
Some users of k&N filters over oil after they wash their filter causing dust particles that "un-sticks" from the filter to stick to the MAF sensor.
but its a simple fix to clean it by the mech.
cheers!
vegadonovan
Well-Known Member
Re: How good K&N air filter??
I just got my K&N from Mcwell Ubi. It should be better than the stock filter which is always dirty. Still trying it out. =)
I just got my K&N from Mcwell Ubi. It should be better than the stock filter which is always dirty. Still trying it out. =)
wt_know
Well-Known Member
Re: How good K&N air filter??
no wonder the stock air filter is so restricted la especially when the sleeve is totally clog up.
DIY Washing of E90 CKD 320i Air Filter "Sleeve" - BMWClubMalaysia.com Forums
that answer "how good is K&N filter" ....
by the way, do normal service entail cleaning the sleeve ?
when pml said change air filter means change the sleave too ?
no wonder the stock air filter is so restricted la especially when the sleeve is totally clog up.
DIY Washing of E90 CKD 320i Air Filter "Sleeve" - BMWClubMalaysia.com Forums
that answer "how good is K&N filter" ....
by the way, do normal service entail cleaning the sleeve ?
when pml said change air filter means change the sleave too ?
tlkchew
Well-Known Member
Re: How good K&N air filter??
Doesnt that sleeve add extra restriction to the airflow? I would remove the sleeve altogether, even with the stock filter.
i guess when you purchase a new stock filter, it should come with the sleeve.
I am not sure what you mean by "that answer "how good is K&N filter" but its damn good!
Doesnt that sleeve add extra restriction to the airflow? I would remove the sleeve altogether, even with the stock filter.
i guess when you purchase a new stock filter, it should come with the sleeve.
I am not sure what you mean by "that answer "how good is K&N filter" but its damn good!
wt_know
Well-Known Member
Re: How good K&N air filter??
ok. change air filter means a new sleeve which comes together.
i'm sceptical that after market drop in is "a lot" better than oem filter because the bottle neck is how much air get into the airbox especially for 320 since there is only 1 air funnel (the other one is dummy).
now seeing the sleeve that cover the whole oem air filter, that answer how good k&n filter is (hurricane will be even better)
tlkchew;449587 said:Doesnt that sleeve add extra restriction to the airflow? I would remove the sleeve altogether, even with the stock filter.
i guess when you purchase a new stock filter, it should come with the sleeve.
I am not sure what you mean by "that answer "how good is K&N filter" but its damn good!
ok. change air filter means a new sleeve which comes together.
i'm sceptical that after market drop in is "a lot" better than oem filter because the bottle neck is how much air get into the airbox especially for 320 since there is only 1 air funnel (the other one is dummy).
now seeing the sleeve that cover the whole oem air filter, that answer how good k&n filter is (hurricane will be even better)
Re: How good K&N air filter??
Filtration quality is dependent on the following:-
#1 removal rating? e.g. 5um at 99+% efficiency?
#2 surface area of filtration media?
#3 resistance of flow? differential pressure
Good filter are meant to choke (plug up), if it doesn't choke... either the environment is very clean or the filter media removal rating is bigger. E.G. OEM rating let say is 5um at 90% eff. it maybe 10 or 20um rating.
To have lower restriction of flow without compromising contaminant removal, you need to increase surface area of filtration media. Oil in my opinion is not require in the filtration media, brownian motion of small particle will help adhere the particle to the fiber.
Just my 2 cent to consider if you are looking into upgrading.
Filtration quality is dependent on the following:-
#1 removal rating? e.g. 5um at 99+% efficiency?
#2 surface area of filtration media?
#3 resistance of flow? differential pressure
Good filter are meant to choke (plug up), if it doesn't choke... either the environment is very clean or the filter media removal rating is bigger. E.G. OEM rating let say is 5um at 90% eff. it maybe 10 or 20um rating.
To have lower restriction of flow without compromising contaminant removal, you need to increase surface area of filtration media. Oil in my opinion is not require in the filtration media, brownian motion of small particle will help adhere the particle to the fiber.
Just my 2 cent to consider if you are looking into upgrading.
