advice: so i took out this filter

samhat · 06-22-2009, 05:03 AM

as stated i have the rpi scop and bmc drop in.. i went to clean it today and noticed another filter mounted on top of the inner airbox... do i remove that or not????? its the filter that is inside the airbox and wen u close it, it sits right on top of the drop in... any advice wood be appreciated

jragan · 06-22-2009, 08:54 AM

Most remove it.

BTW, you have a typo in your profile "Drives:" section. (It's a z4mc not an a4mc)

Leonardo629 · 06-22-2009, 01:09 PM

It's an emission filter to catch fuel vapors after the engine shuts off. I think most of left the filter alone since there's no power to be gained by removing it.

samhat · 06-22-2009, 02:12 PM

actually i feel a difference

jragan · 06-22-2009, 02:35 PM

Dyno plots do show a slight increase with the filter removed.

Leonardo629 · 06-22-2009, 02:54 PM

you get about 1~1.5hp with the charcoal filter removed, and I really doubt you can feel it.

Who cares, I have GruppeM/RPI intake, and it's definitely better than the stock air box.

samhat · 06-22-2009, 03:01 PM

the car feels more responsive

samhat · 06-22-2009, 03:02 PM

Quote:

Originally Posted by Leonardo629

you get about 1~1.5hp with the charcoal filter removed, and I really doubt you can feel it.

Who cares, I have GruppeM/RPI intake, and it's definitely better than the stock air box.

i dont feel like spending a ton on intake mods

jmillet · 06-22-2009, 03:39 PM

Quote:

Originally Posted by samhat

as stated i have the Rpi scoop and bmc drop in.. I went to clean it today and noticed another filter mounted on top of the inner airbox... do I remove that or not????? its the filter that is inside the airbox and when u close it, it sits right on top of the drop in... any advice would be appreciated

If your Z4MC is still under factory warranty then my advice is don't remove the filter per SIB 12 12 07
http://bimmerfest.com/forums/showpos...4&postcount=25

RussRamz · 06-23-2009, 01:14 PM

Quote:

Originally Posted by samhat

as stated i have the rpi scop and bmc drop in.. i went to clean it today and noticed another filter mounted on top of the inner airbox... do i remove that or not????? its the filter that is inside the airbox and wen u close it, it sits right on top of the drop in... any advice wood be appreciated

The carbon filter is safe to remove.

Z4MCJJ · 06-23-2009, 01:39 PM

Quote:

Originally Posted by RussRamz

The carbon filter is safe to remove.

Mine has been off for 6 months....no probs noted.

RussRamz · 06-25-2009, 03:59 AM

Quote:

Originally Posted by Z4MCJJ

Mine has been off for 6 months....no probs noted.

Yes. I removed mine on the first day of ownership and there are absolutely no issues other than a slight increase in throttle response.

06-22-2009, 05:03 AM	#1
samhat Enlisted Member 1 Rep 38 Posts Drives: aw a4mc & 335i conv. Join Date: Dec 2007 Location: northville michigan iTrader: (0)	advice: so i took out this filter as stated i have the rpi scop and bmc drop in.. i went to clean it today and noticed another filter mounted on top of the inner airbox... do i remove that or not????? its the filter that is inside the airbox and wen u close it, it sits right on top of the drop in... any advice wood be appreciated
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06-22-2009, 08:54 AM	#2
jragan Imola Lover 26 Rep 749 Posts Drives: 2007 Imola Red M Coupe Join Date: Jul 2008 Location: Fort Worth, Texas iTrader: (0)	Most remove it. BTW, you have a typo in your profile "Drives:" section. (It's a z4mc not an a4mc) __________________ His: RIP-"Ruby" *E86 ///M Coupe: Pics Track Pics Short Vids Long Vids Hers: 997-1 C4S*: Pics
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06-22-2009, 01:09 PM	#3
Leonardo629 Lieutenant Colonel 168 Rep 1,792 Posts Drives: 2013 M3 Coupe Join Date: Sep 2006 Location: Taiwan iTrader: (10)	It's an emission filter to catch fuel vapors after the engine shuts off. I think most of left the filter alone since there's no power to be gained by removing it.
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06-22-2009, 02:12 PM	#4
samhat Enlisted Member 1 Rep 38 Posts Drives: aw a4mc & 335i conv. Join Date: Dec 2007 Location: northville michigan iTrader: (0)	actually i feel a difference
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06-22-2009, 02:35 PM	#5
jragan Imola Lover 26 Rep 749 Posts Drives: 2007 Imola Red M Coupe Join Date: Jul 2008 Location: Fort Worth, Texas iTrader: (0)	Dyno plots do show a slight increase with the filter removed. __________________ His: RIP-"Ruby" *E86 ///M Coupe: Pics Track Pics Short Vids Long Vids Hers: 997-1 C4S*: Pics
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06-22-2009, 02:54 PM	#6
Leonardo629 Lieutenant Colonel 168 Rep 1,792 Posts Drives: 2013 M3 Coupe Join Date: Sep 2006 Location: Taiwan iTrader: (10)	you get about 1~1.5hp with the charcoal filter removed, and I really doubt you can feel it. Who cares, I have GruppeM/RPI intake, and it's definitely better than the stock air box.
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06-22-2009, 03:01 PM	#7
samhat Enlisted Member 1 Rep 38 Posts Drives: aw a4mc & 335i conv. Join Date: Dec 2007 Location: northville michigan iTrader: (0)	the car feels more responsive
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