Charcoal Filter Removal - Step-by-Step (w/Pictures) - Page 7 - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #61 of 553 Old 3rd February 2006, 05:28 PM
PPG4
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Quote:
Originally Posted by Niknotiq
It makes sense to me that the difference would be felt primarily at lower speeds / RPMs. When you are going 100 mph I don't think there is a problem getting air into the engince. That filter won't reduce the airflow one bit at those speeds because the air is being pushed into the engine with such force. However at lower speeds when the car is trying to suck air this filter could restrict air flow. I'm no expert, but does this make sense?

This is definitely a good thing since this car does lack a bit of power at lower RPMs, so anything that can improve that will be much appreciated.

I will be doing this mod over the weekend and will report my 2 cents. Many thanks to everyone who has contributed to this thread.
I got a chance to open it up a little on the drive in this morning... I can't say if the car is making more power, but it definitely feels like it breathes easier at higher rpm's and speeds.

It makes sense... the car isn't trying to suck air through a pound of tightly packed charcoal stuffed into heavy paper.
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post #62 of 553 Old 3rd February 2006, 05:33 PM
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Quote:
Originally Posted by PPG4
I got a chance to open it up a little on the drive in this morning... I can't say if the car is making more power, but it definitely feels like it breathes easier at higher rpm's and speeds.

It makes sense... the car isn't trying to suck air through a pound of tightly packed charcoal stuffed into heavy paper.
I agree with you, not sure about power but the delivery and throttle response are definitely improved. I am really thankful for the instructions to do this, best

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post #63 of 553 Old 3rd February 2006, 08:54 PM Thread Starter
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I'm going to try to get a dyno soon - I'm pretty sure there will be an increase. I have seen others post dyno results that are in the 415-420 range stock, with no mods. Metalman just started a thread with his dyno results - without filters - 450 - and he wasn't able to max it out all the way. I have been running a combo of 91 octance, plus 1/4 tank of 100 octane - and this combined with the filter removal makes a substantial difference - not an imaginary difference - a real tangible difference - way quicker throughout the entire rev band from 1k rpm and up. I think the higher octane combined with more airflow produces a great combo and great results. Anyone who has access to the gas, I would recommend trying it.
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post #64 of 553 Old 3rd February 2006, 09:01 PM
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Quote:
Originally Posted by jfenley
I think the higher octane combined with more airflow produces a great combo and great results. Anyone who has access to the gas, I would recommend trying it.
If we don't have the gas, would octane booster suffice?

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post #65 of 553 Old 3rd February 2006, 09:04 PM
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What is the part number for the Euro filter?

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post #66 of 553 Old 3rd February 2006, 09:17 PM Thread Starter
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Quote:
Originally Posted by drewzMMM
If we don't have the gas, would octane booster suffice?
I don't know enough to comment on that - never tried it. All I can say is that the 100 octane gas is VERY expensive - over $6.50/gallon.
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post #67 of 553 Old 3rd February 2006, 09:25 PM
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For those of us in SoCal, here is a link for the 100 Octane fuel. ChaChing!!!

http://www.osbornauto.com/racing/other.htm

Quote:
Originally Posted by jfenley
I don't know enough to comment on that - never tried it. All I can say is that the 100 octane gas is VERY expensive - over $6.50/gallon.

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Last edited by AbruzziBoy; 3rd February 2006 at 09:26 PM.
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post #68 of 553 Old 3rd February 2006, 09:32 PM Thread Starter
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Quote:
Originally Posted by AbruzziBoy
For those of us in SoCal, here is a link for the 100 Octane fuel. ChaChing!!!

http://www.osbornauto.com/racing/other.htm
Awesome! Great list. Add the 76 station at San Vicente and Bundy in Brentwood. Terrence turned me on to this one - I drive by it every day and didn't even know it was available!
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post #69 of 553 Old 3rd February 2006, 10:10 PM
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Quote:
Originally Posted by jfenley
I don't know enough to comment on that - never tried it. All I can say is that the 100 octane gas is VERY expensive - over $6.50/gallon.
I have tried it it makes a tangible difference but only if you use the goof stuff; I recommend NOS Race octane booster (not the regular) and use two bottles per tank, that should boost it up by 1-1.5 octane units.
We have 100 octane gas in 4 gas stations in MA but they are each 1-2 hours away from Boston, so a pain and it's $40 for a 5 galloon tank...
Anyhow, i will try the octane booster with the 2ndary filter removed. Even without the booster it's awesome...
Can't believe BMW choked the engine for the US like that, it is so much better without the charcoal filter...

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post #70 of 553 Old 3rd February 2006, 11:27 PM
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Quote:
Originally Posted by drewzMMM
If we don't have the gas, would octane booster suffice?
It should, one warning, most (all?) octane bosters are rated in points, e.g. will increase octane 4 points, which really means .4 octane.

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