BMC air filters
03-08-2016, 08:12 PM
#31
Race Director
I'm no expert on this but logically it doesn't seem like a freer flowing filter would make a difference at altitude. A NA engine can only "breathe" in so much air based on it's displacement and other design factors and as long as the stock filter is adequate for the demands of this air flow at sea level, a lower restriction filter won't make a difference at altitude. In that case, air flow isn't the limiting factor, it's the oxygen in the air flow. As was mentioned FI, not a freer flowing filter, is what's needed at altitude. Just my thought....
03-08-2016, 08:23 PM
#32
Race Car
Thread Starter
Join Date: Jan 2013
Location: The way to hell is paved by good intentions “Wenn ich Purist höre...entsichere ich meinen Browning” "Myths are fuel for marketing (and nowadays for flippers too,,,)" time to time is not sufficient to be a saint, you must be also an Hero
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^ Ok it will be boring until next Frankfurt autoshow
but i can t spend my time on this intuitive info
Oem GT3 paper filters get dirty in a 2 or 3k miles and you
can t wash them
i just changed with BMC air filters and the 8 9k rpm
is improved
air flow is improved
and last not least paper filters
deteriorate faster in humid conditions
who cares of sound that s from exhaust or filters not homologated
150$ well spend without needing a dyno or whatever
Btw noone answered the question
Why motorsport and RS use BMC filters and not paper crap ones?
but i can t spend my time on this intuitive info
Oem GT3 paper filters get dirty in a 2 or 3k miles and you
can t wash them
i just changed with BMC air filters and the 8 9k rpm
is improved
air flow is improved
and last not least paper filters
deteriorate faster in humid conditions
who cares of sound that s from exhaust or filters not homologated
150$ well spend without needing a dyno or whatever
Btw noone answered the question
Why motorsport and RS use BMC filters and not paper crap ones?
03-08-2016, 08:28 PM
#34
Race Director
03-08-2016, 08:29 PM
#35
Race Car
Thread Starter
Join Date: Jan 2013
Location: The way to hell is paved by good intentions “Wenn ich Purist höre...entsichere ich meinen Browning” "Myths are fuel for marketing (and nowadays for flippers too,,,)" time to time is not sufficient to be a saint, you must be also an Hero
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03-09-2016, 12:53 PM
#36
Rennlist Member
I put my well massaged 944 turbo on the dyno with and without a filter and it didn't make any difference. My old mind tells me there's no measurable power to be gained.
03-09-2016, 12:55 PM
#37
Nordschleife Master
Read the ISO report I've posted a page back,if you have time...
03-13-2016, 04:40 PM
#38
Race Director
I am going to replace my air filters with the BMC to see. Reading various posts on other forums, and ran across a few people at altitude who said local mechanics recommended less restrictive air filters to improve mpg and hp. Several posters said the power difference was noticeable.
If possible I will get a before and after dyno to share. Just need to find the right shop.
If possible I will get a before and after dyno to share. Just need to find the right shop.
03-13-2016, 05:19 PM
#39
I swapped to the BMC filter but only because i had the bumper off anyways installing gmg exhaust bypass, so figured i might as well. BMC seem high quality - though my OEM filters were not particularly dirty and i wouldn't describe them as clogged in anyway (~4500 miles on my car) - OP claims his were very dirty / clogged, which i find surprising. Curious if any others actually had dirty / clogged filters after relatively few miles.
03-13-2016, 05:36 PM
#40
Race Car
Thread Starter
Join Date: Jan 2013
Location: The way to hell is paved by good intentions “Wenn ich Purist höre...entsichere ich meinen Browning” "Myths are fuel for marketing (and nowadays for flippers too,,,)" time to time is not sufficient to be a saint, you must be also an Hero
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In European high density populated town
you will find more dirty filters due always too many amount of diesel cars as around london frankfurt milan etc.
i guess 2-4k miles in traffic jam frequent conditions (my case)
and maybe 8k miles in cleaner environments
is a fair interval to change or clean (not the oem) air filters
but you have to factor humidity , salt and dust variables as well
you will find more dirty filters due always too many amount of diesel cars as around london frankfurt milan etc.
i guess 2-4k miles in traffic jam frequent conditions (my case)
and maybe 8k miles in cleaner environments
is a fair interval to change or clean (not the oem) air filters
but you have to factor humidity , salt and dust variables as well
03-13-2016, 08:48 PM
#41
Nordschleife Master
I am going to replace my air filters with the BMC to see. Reading various posts on other forums, and ran across a few people at altitude who said local mechanics recommended less restrictive air filters to improve mpg and hp. Several posters said the power difference was noticeable.
If possible I will get a before and after dyno to share. Just need to find the right shop.
If possible I will get a before and after dyno to share. Just need to find the right shop.
03-13-2016, 08:54 PM
#42
Race Director
03-13-2016, 10:22 PM
#43
Race Director
03-13-2016, 10:30 PM
#44
Race Director
03-14-2016, 09:10 AM
#45
I am having a BMC filter installed this week along with GMG exhaust and the Tech doing the work said the BMC filter will help the fuel burn more efficient and change the exhaust sound but would not not any HP. This sounds correct to me.