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> K&N Air Filter: Testing for MPG Change, Do they help? Hinder? I attempt to find out
NevynPA
post Jul 22 2011, 02:19 PM
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So, FSUSpectra was kind enough to send me his K&N air filter that he wasn't using for me to test and shed some light on the big question:


Does a K&N air filter help you get better MPG?


There are two sides to this, and while my testing won't put the question to rest once and for all, it will at least provide some results that will hopefully be useful.

I've uploaded the videos I have so far to YouTube and created a playlist for them:

http://www.youtube.com/playlist?list=PL05C4F32D9B4E1CB0

I have still photos as well, and they will be hosted (elsewhere) and posted (here).



Plaintiff: K&N filters are bad for MPG.

Argument: K&N designed their air filters to be more free-flowing than the conventional air filter. By allowing more air into the engine, the ECU then adjusts the amount of fuel injected to compensate for the greater mass of air in order to maintain the proper air/fuel ratio. More fuel being injected means more fuel burned, thus lower MPG.

Defendant: K&N filters are good for MPG.

Argument: With the additional air being brought in by the engine, it develops more power. This added boost of power allows the engine to run more efficiently, increasing MPG. The extra power allows the engine to be able to work efficiently in higher gears (4th/5th) at a lower speed, thus delaying the need for a downshift to a less efficient gear.

Evidence:











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slowgls
post Jul 22 2011, 02:29 PM
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Cant wait to see the results. Good work.


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Silentwolf
post Jul 23 2011, 12:40 AM
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Should be interesting. Lot to be said for being able to shift at a lower rpm to a higher gear. I'm able to accelerate from 10mph with much less effort now with the CAI.


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popeye
post Jul 23 2011, 12:51 AM
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I'm not interested in mpgs, I just like the sound I get from having a less restricted intake lol! j/k, it'll be interesting to see what the results are. You'll have to post them for peer review first though wink.gif


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Elantrick
post Jul 23 2011, 02:54 PM
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I My results after installing a short intake are less mpg. The engine probably makes more power, but I just like the sound so I am not getting as good milage


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with hid fog lamps wired independent of the Low beams, cold air intake, Edelbrock springs lowered 1.25" with KYB shocks and Tinted Windows.
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NevynPA
post Jul 25 2011, 10:43 AM
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If you "like the sound" then you're in the pedal WAY too deep, too often to be doing it for MPG. I've got a 100% stock airbox. The sound is different, but only barely. I'll hopefully get the stills up today.


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FSUspectra
post Jul 25 2011, 11:11 AM
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Thanks again for taking this on (although I'm sure it's not too much hair off your back wink.gif). Looking forward to the results.


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benman
post Oct 17 2011, 02:13 PM
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Stumbled upon this topic searching for something else today -- so did you ever draw any conclusions?


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NevynPA
post Oct 17 2011, 02:26 PM
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I have lots of data, and little time to compile it. My laptop is working again and that's where all my photos are - I just have to get them up and hosted, organized, my fill-ups charted, and it all written out.

Quick thought is no, it's no different for MPG - but it does change the performance of the car.


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1 members thank NevynPA for this post
jamhandman
benman
post Oct 18 2011, 05:55 AM
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Coincidentally, I got home to find that the K&N drop-in I'd ordered from Amazon (yes, though the EC Affiliate link) had arrived. I dropped it in this morning (and also removed the PZEV charcoal filter) before my morning commute.

Anecdotal evidence this morning is the same: there was no discernable change in fuel economy at various checkpoints along the way, but a world of difference in performance on the hills (especially the very steep one that begins my commute).


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jamhandman
post Oct 18 2011, 06:45 AM
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hmmm.... maybe I'll get one for mine and the wife's accent smile.gif We do drive on a LOT of hills here. I'm just not too comfortable I'll maintain the filter correctly. Hmmm... maybe..


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Spectre
post Jul 5 2012, 05:30 PM
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I had bought an accord CAI for my car and have been having a lot of trouble getting it on. I just now noticed this thread and I have a K&N drop in filter. Maybe I should just leave the filter in and not bother with the CAI, based on the feedback I see here.


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2004 Hyundai Elantra
K & N Filter, V Power NGK Sparkplugs, 8" Bazooka Tube, Clifford Matrix 12 Security System, Beltronics STI-R Remote Mount Radar Detector, Cheetah GPS Mirror, Clarion NX-602 GPS head unit, Sport Edition A10 wheels, Kumho Sense KR26 tires, Sensen struts, H & R Springs, 18mm Tiburon sway bar, Brakemotive rotors

1991 Mazda Miata Special Edition BRG
'99 1.8L engine swap, Magnaflow Highflow Cat Converter

1995 Ford Ranger 3.0 5 Speed
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