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post #1 of 88 Old 2nd May 2007, 04:27 PM Thread Starter
JoeCaMotto
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Question Question about K&N drop in filters

K&N has released the drop in filers for the Beast, I bought a set and have the charcol's removed + SS race exhaust and Xpipe. But i feel my car worked better with the stock air filters, or it's just me ps maybe a chip will help?

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post #2 of 88 Old 2nd May 2007, 05:31 PM
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Several people felt the same way you do when they put these in. Give it a few hundred miles and see what you think then. The engine might just need to adjust to a different airflow to bring power back to even. And remember, the butt-o-meter isn't always reliable. Even a small change in sound can make someone think they have gained or lost power when there was no change.

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post #3 of 88 Old 2nd May 2007, 07:46 PM
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A simple before and after dyno run would be nice.

Unfortunately for some reason this doesn't seem to be information that aftermarket suppliers feels increases the demand for their products. That should tell you something.

Mike
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post #4 of 88 Old 2nd May 2007, 08:03 PM
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Quote:
Originally Posted by Wolverine View Post
A simple before and after dyno run would be nice.

Unfortunately for some reason this doesn't seem to be information that aftermarket suppliers feels increases the demand for their products. That should tell you something.
A before and after dyno isnt good enough. you are comparing a used filter (original) with a new one (K&N). you must dyno with filters having the same amount of use.
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post #5 of 88 Old 2nd May 2007, 09:35 PM
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Is it me or when you remove the carbon filters and put the K & N in, you get worse gas mileage??

07 550i White/Gray/Dark Burl

Options: CWP, Steptronic, Rear Air Bags, Rear Shades, Comfort Seats, Fold Down Seats, Heated Rear Seats, Navigation, Heads Up Display, Satellite Radio, Logic 7, Real Time Traffic

Born on 2/4/2007......Delivered on 3/10/2007 and driving ever since!!

Mods: V1 Hardwired with Consealed Display, iPod Intergration, HUD Adjustment, K & N Airfilter w/charcoal filters removed, Highgloss Shadowline Chrome Trim on the B & C Pillars.

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post #6 of 88 Old 2nd May 2007, 09:53 PM
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Quote:
Originally Posted by bmw1986 View Post
Is it me or when you remove the carbon filters and put the K & N in, you get worse gas mileage??
Regardless of the carbon filters...I think that is just the thing. Too many reports of reduced power from the K&N drop-in filters on this car. Reduced power would also generally lean towards reduced mileage...although I can say that my mileage has steadily been going down since I got the car as I simply get more comfortable and more often aggressive with it.

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post #7 of 88 Old 3rd May 2007, 01:00 AM
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Quote:
Originally Posted by 7 speed SMG View Post
A before and after dyno isnt good enough. you are comparing a used filter (original) with a new one (K&N). you must dyno with filters having the same amount of use.
OK then - but I don't want to do it. Explain to me why this is impossible for K&N to do...

I assume they do some type of testing that shows their filter provides some type of benefit. Otherwise, why what good is it? All we're asking for is the results of whatever testing they did.

Mike
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post #8 of 88 Old 3rd May 2007, 01:14 AM
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Quote:
Originally Posted by Wolverine View Post
OK then - but I don't want to do it. Explain to me why this is impossible for K&N to do...

I assume they do some type of testing that shows their filter provides some type of benefit. Otherwise, why what good is it? All we're asking for is the results of whatever testing they did.
I totally agree with you mike, its K&N problem to put their claims to the test, but i just wanted to make it clear that you have to compare filters in the same conditions
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post #9 of 88 Old 3rd May 2007, 01:15 AM
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Quote:
Originally Posted by Wolverine View Post
OK then - but I don't want to do it. Explain to me why this is impossible for K&N to do...

I assume they do some type of testing that shows their filter provides some type of benefit. Otherwise, why what good is it? All we're asking for is the results of whatever testing they did.
Possible? Yes. Probable? No. They have all their intake kits to work on and dyno. I think on the drop-in filters they probably don't do any testing because they simply make too many of them. Do you know any larger air intake/filter company that does dynos on their drop-in products too on every single car? For intake kits it's another story...bigger numbers involved to spread out the costs of much greater R&D work, but at this point I think K&N just looks at their drop-in filters as an established benefit. Even if there are no gains/losses in performance, at least you have a permanent filter that is known to pass at least as much air through while filtering more out of it versus OEM filters (cotton? paper?).

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post #10 of 88 Old 3rd May 2007, 01:18 AM
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I found that the K&N drop in to give me the same effect that removing the charcol filters did over again. I would definitely recommend this.

I haven't experienced the mileage issue. I kept my car cruise control at 80 for a 5 hour drive back from Illinois (less occasional slow traffic and fuel stops), and I averaged 16.1 MPG. I don't have an equivalent for pre-K&N, but I don't see that it could possibly be any better than 16.1.

Indy, Black Perf, Olive Ash
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