K&N Air Filter installed, MPG dropping? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

HATED1 · 09-01-2013, 10:52 PM

As the title says, just put in a K&N Drop in filter and my MPGs are steadily dropping. Will it change after a few hundred miles? (ecu learning?) Something i forgot to do? thanks for any info.

Adeets · 09-01-2013, 10:54 PM

Did you clog the sound creator tube while you were at it?

Nightbringer · 09-01-2013, 11:09 PM

I ended up resetting my ECU after installing the filter by disconnecting the negative battery terminal for 10 minutes. Not technically necessary for something so minor, but my mpg after a full relearn was more favorable. Worth a try.

cfusionpm · 09-01-2013, 11:52 PM

You sure its not just driving habits? My MPG has only gone up or stayed steady for the past several months. Mostly just consciously trying to drive economically and only pushing when I feel sporty. I've been averaging 25.4 mpg with about 80% city driving. My longer freeway trips see 33-35 mpg. I have a manual trans and put in a K&N drop in filter back in may.

Young_makaveli · 09-02-2013, 12:00 AM

Ive been averaging 9.8

Mobius357 · 09-02-2013, 08:46 AM

@Young_makaveli MPG or L/100km?

Trigonx · 09-02-2013, 06:14 PM

I installed the K&N air filter last weekend, have gone through one full tank of gas. My MPG has increased by 1.3 mpg, from 25.57 mpg to 26.9 mpg. I did not reset the ECU, I just popped it in.

Young_makaveli · 09-02-2013, 06:15 PM

Quote:

Originally Posted by Mobius357

@Young_makaveli MPG or L/100km?

Sorry L/100km

Young_makaveli · 09-02-2013, 09:57 PM

Actually I'm getting

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Size: 66.0 KB

cfusionpm · 09-02-2013, 10:10 PM

I wouldn't rely on the dash display, it's very.... optimistic. I track everything myself through the Android app FuelLog:

xjohnx · 09-02-2013, 10:29 PM

clean your maf sensor.

clintavo · 09-03-2013, 09:35 AM

Quote:

Originally Posted by xjohnx

clean your maf sensor.

What he said. Get a bottle of MAF spray cleaner.

I cleaned mine 50 miles after a K&N install just to be safe. Probably will do it again before I get a tune.

FR-S Matt · 09-03-2013, 09:39 AM

Fuelly is a great tool to use as well just like that app. Runs off your odometer or trip meter. My MPG gauge is usually 1.5-2 mpg off from the actual number mainly because it factors in idle time.

projectXTR · 09-04-2013, 05:54 AM

Quote:

Originally Posted by Young_makaveli

Actually I'm getting

Attachment 50110

8.5 here , driving spirited every now and then, not even that much highway... I wonder how much it would drop if I were to put in an aftermarket drop in filter

09-01-2013, 10:54 PM	#2
Adeets OEDC Join Date: Oct 2012 Drives: Vortech 8.5psi 274WHP 2013 BRZ Location: Pa Posts: 619 Thanks: 117 Thanked 263 Times in 159 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Did you clog the sound creator tube while you were at it? __________________ My BRZ FI Build Visconti is like a Tick that sucks as much blood(money) as he can before you figure out he's there. please make sure to leave your experiences with visconti on his feedback thread located here: Visconti feedback

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09-01-2013, 11:09 PM	#3
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I ended up resetting my ECU after installing the filter by disconnecting the negative battery terminal for 10 minutes. Not technically necessary for something so minor, but my mpg after a full relearn was more favorable. Worth a try.

09-02-2013, 12:00 AM	#5
Young_makaveli Senior Member Join Date: Aug 2013 Drives: 2013 frs Location: Montreal Posts: 712 Thanks: 181 Thanked 88 Times in 77 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Ive been averaging 9.8

09-02-2013, 08:46 AM	#6
Mobius357 Senior Member Join Date: Sep 2012 Drives: '15 WRX '13 Legacy '07 Colorado Location: Seacoast NH Posts: 337 Thanks: 10 Thanked 118 Times in 82 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	@Young_makaveli MPG or L/100km?

09-02-2013, 06:14 PM	#7
Trigonx Member Join Date: Jul 2013 Drives: WRB BRZ Location: Wisconsin Posts: 33 Thanks: 53 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I installed the K&N air filter last weekend, have gone through one full tank of gas. My MPG has increased by 1.3 mpg, from 25.57 mpg to 26.9 mpg. I did not reset the ECU, I just popped it in.

09-02-2013, 09:57 PM	#9
Young_makaveli Senior Member Join Date: Aug 2013 Drives: 2013 frs Location: Montreal Posts: 712 Thanks: 181 Thanked 88 Times in 77 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Actually I'm getting

09-02-2013, 10:29 PM	#11
xjohnx Grip>Slip Join Date: Jun 2012 Drives: 13 SWP BRZ Ltd - Innovate Powered! Location: RVA Posts: 3,563 Thanks: 656 Thanked 1,716 Times in 1,031 Posts Mentioned: 45 Post(s) Tagged: 3 Thread(s)	clean your maf sensor.

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