Aftermarket Air Filters - Toyota Yaris Forums

GeneW · 04-12-2009, 02:18 PM

Opted to go with a NAPA Gold Air Filter because it seemed thicker and thus more efficient than the Factory filter. Does get dirty a LOT faster. I figure roughly about 5,000 to 10,000 miles per filter. Isn't too bad, cheaper than engine wear.

Negligible impact upon fuel efficiency. I made two long (50 mile) trips yesterday and netted 38 mpg, with cool air (about fifty five degrees fahr) and some "stop and go" and "evading idiots" traffic. Usually my Yaris crests 40 mpg when the ambients go over 80 fahrenheit.

Gene

talnlnky · 04-12-2009, 05:06 PM

Quote:

Originally Posted by GeneW

Opted to go with a NAPA Gold Air Filter because it seemed thicker and thus more efficient than the Factory filter. Does get dirty a LOT faster. I figure roughly about 5,000 to 10,000 miles per filter. Isn't too bad, cheaper than engine wear.

Negligible impact upon fuel efficiency. I made two long (50 mile) trips yesterday and netted 38 mpg, with cool air (about fifty five degrees fahr) and some "stop and go" and "evading idiots" traffic. Usually my Yaris crests 40 mpg when the ambients go over 80 fahrenheit.

Gene

yeah... as far as i've been able to read... there is a trade off with air filters, Higher airflow = less filtration/more particles/more HP
Lower airflow = more filtration/less particles/less HP

I can't imagine <1HP being worth the increased wear and tear... I want my engine & everything else to last a good while before I have to start paying for replacements. Hell, I wouldn't mind handing this car off to my kid someday (thats right... i'm not maried, and have no kids right now).

intake · 04-13-2009, 03:16 AM

foam filters filter more dust and increase air flow
yes, i know, this sound strange, but it's real

1stToyota · 04-13-2009, 08:40 AM

Unless dust is a problem in your area filters should last longer than 10K miles. Road constuction on the way home sometimes kicks up lots of dust and I just changed out my air filter at 14K and it still looked pretty clean.

hatchbackkid82 · 04-13-2009, 12:46 PM

BailOut · 04-13-2009, 02:47 PM

My K&N drop-in panel filter offers no better MPG, either, but I like it for the reusability and lifetime warranty. I clean it every 6 months (I just cleaned it yesterday, in fact).

People love to jaw about filtration and often rag on K&N for supposedly letting in too much stuff but my throttle body and fuel injection housing are as clean as the day I got the car 40k miles ago.

1stToyota · 04-13-2009, 03:54 PM

I don't think a K&N drop-in has the ability to muck things up like a short ram; the stock air box has a nice little blanket in the upper portion.

AlexNet0 · 04-13-2009, 09:06 PM

yeah... little blanket... cut that stupid thing out... lol

Kaotic Lazagna · 04-14-2009, 12:26 AM

Quote:

Originally Posted by BailOut

My K&N drop-in panel filter offers no better MPG, either, but I like it for the reusability and lifetime warranty. I clean it every 6 months (I just cleaned it yesterday, in fact).

People love to jaw about filtration and often rag on K&N for supposedly letting in too much stuff but my throttle body and fuel injection housing are as clean as the day I got the car 40k miles ago.

So do you think an AFE Stage 2 dry intake would improve gas mileage? I know when I went to a stock box from a SRI on my GTI, I lost 2-5 mpg.

BailOut · 04-14-2009, 01:15 AM

Quote:

Originally Posted by Kaotic Lazagna

So do you think an AFE Stage 2 dry intake would improve gas mileage? I know when I went to a stock box from a SRI on my GTI, I lost 2-5 mpg.

With a little engine like ours where breathing is never a problem no filter or aftermarket intake is going to help with mileage or power. A blocked filter can certainly impede air flow but any clean filter and system will do.

1stToyota · 04-14-2009, 07:56 AM

Quote:

Originally Posted by AlexNet0

yeah... little blanket... cut that stupid thing out... lol

I like the extra protection, and if I did cut it out the MAF meter would most likely just do its job and readjust for the little bit of extra aiflow that it's now seeing.

Yaris Hilton · 04-14-2009, 09:23 AM

BailOut's right. Whenever you're operating at part throttle the pumping losses pulling air past the partly closed throttle are what consume wasted energy from the engine, and if you put in a freer flowing intake, you'll just close the throttle a little more to get the same power and are right back where you started. In a system that mixes fuel with air by volume, as a carburetor does, a restrictive or dirty filter will cause the mixture to go rich and lower mileage. An engine control system that measures mass airflow and fine tunes the mixture with feedback from an exhaust oxygen sensor won't richen the mixture under those circumstances, and its mileage won't be affected. Only maximum power will be decreased due to limited maximum airflow.

Pretty much the same applies to cold air intakes. Only thing they can help is maximum power at wide open throttle. Under some circumstances they may decrease engine efficiency and increase emissions, if the fuel's evaporation is delayed by the lower air temperature. Most of the time, with a warm engine, they'll make little difference.

Kaotic Lazagna · 04-14-2009, 02:58 PM

Hey Brian, does .5 more displacement really do a big difference? I mean, my GTI only had 9 more hp than my Yaris.

YarisHilton, I'm sorry, I kinda got lost in your post (doesn't help that I'm rushing here, I'm also studying for a test).

Yaris Hilton · 04-14-2009, 03:27 PM

I just explained as simply as I know how that no air filter (or cold air intake) is going to boost your fuel economy. Any observed differences people report are coming from the well known effects of changing anything that you expect to make an improvement.

1stToyota · 04-14-2009, 03:29 PM

Quote:

Originally Posted by Kaotic Lazagna

Hey Brian, does .5 more displacement really do a big difference? I mean, my GTI only had 9 more hp than my Yaris.

YarisHilton, I'm sorry, I kinda got lost in your post (doesn't help that I'm rushing here, I'm also studying for a test).

In simple terms, when engines were dumb, as with carburetors, they could be fooled by a HP filter, but new cars with OBD-II watching the airflow isn't going to let itself be fooled for long; it'll adjust to anything new that it's seeing, unless tuning is altered.

Kaotic Lazagna · 04-14-2009, 03:35 PM

Quote:

Originally Posted by Yaris Hilton

I just explained as simply as I know how that no air filter (or cold air intake) is going to boost your fuel economy. Any observed differences people report are coming from the well known effects of changing anything that you expect to make an improvement.

lol...I actually would have expected the SRI on the GTI to decrease my gas mileage, but it did the opposite. When ever I get some money, I'll see if I'll have the same experience with the Yaris, although I probably shouldn't get my hopes up.

Kaotic Lazagna · 04-14-2009, 03:36 PM

Quote:

Originally Posted by 1stToyota

In simple terms, when engines were dumb, as with carburetors, they could be fooled by a HP filter, but new cars with OBD-II watching the airflow isn't going to let itself be fooled for long; it'll adjust to anything new that it's seeing, unless tuning is altered.

My GTI was OBD-2, but it was also a '97, so less technology in it

YarisSedan · 04-14-2009, 04:06 PM

http://www.bobistheoilguy.com/index....d=58&Itemid=66

04-12-2009, 02:18 PM	#1
GeneW Banned Drives: 2008 Yaris Join Date: Oct 2008 Location: Pennsylvania Posts: 1,034	Aftermarket Air Filters Opted to go with a NAPA Gold Air Filter because it seemed thicker and thus more efficient than the Factory filter. Does get dirty a LOT faster. I figure roughly about 5,000 to 10,000 miles per filter. Isn't too bad, cheaper than engine wear. Negligible impact upon fuel efficiency. I made two long (50 mile) trips yesterday and netted 38 mpg, with cool air (about fifty five degrees fahr) and some "stop and go" and "evading idiots" traffic. Usually my Yaris crests 40 mpg when the ambients go over 80 fahrenheit. Gene

04-13-2009, 03:16 AM	#3
intake View User's Garage Drives: yaris 2 1.3 mmt Join Date: Aug 2007 Location: italy Posts: 62	foam filters filter more dust and increase air flow yes, i know, this sound strange, but it's real __________________ Yaris 2007 mmt 1.3 , denso power iridium, pipercross air filter, purplepower 10/40 motor oil + zx1, simoni racing silencer, eibach , henry hausen wheels, modified air box, trd logo,oversized oil filter.

04-13-2009, 08:40 AM	#4
1stToyota Drives: 2013 Chevy Spark 1LT 5-speed Join Date: Oct 2008 Location: Oklahoma Posts: 1,185	Unless dust is a problem in your area filters should last longer than 10K miles. Road constuction on the way home sometimes kicks up lots of dust and I just changed out my air filter at 14K and it still looked pretty clean. __________________ 1997 Lincoln Town Car - *SOLD* 2008 Scion xD (w/ automatic) - SOLD 2008 Yaris HB - SOLD

04-13-2009, 02:47 PM	#6
BailOut Steals terrorist's lunch View User's Garage Drives: 2007 Yaris Liftback Join Date: Mar 2007 Location: Reno, Nevada, USA Posts: 1,299	My K&N drop-in panel filter offers no better MPG, either, but I like it for the reusability and lifetime warranty. I clean it every 6 months (I just cleaned it yesterday, in fact). People love to jaw about filtration and often rag on K&N for supposedly letting in too much stuff but my throttle body and fuel injection housing are as clean as the day I got the car 40k miles ago. __________________ - Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs.

04-13-2009, 03:54 PM	#7
1stToyota Drives: 2013 Chevy Spark 1LT 5-speed Join Date: Oct 2008 Location: Oklahoma Posts: 1,185	I don't think a K&N drop-in has the ability to muck things up like a short ram; the stock air box has a nice little blanket in the upper portion. __________________ 1997 Lincoln Town Car - *SOLD* 2008 Scion xD (w/ automatic) - SOLD 2008 Yaris HB - SOLD

04-13-2009, 12:46 PM	#5
hatchbackkid82 Drives: . Join Date: Apr 2007 Location: . Posts: 1,828

04-13-2009, 09:06 PM	#8
AlexNet0 View User's Garage Drives: '07 Yaris 3dr Join Date: Nov 2008 Location: Rockland, ME Posts: 1,638	yeah... little blanket... cut that stupid thing out... lol __________________ ---------- MI-YW ----------

04-14-2009, 09:23 AM	#12
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	BailOut's right. Whenever you're operating at part throttle the pumping losses pulling air past the partly closed throttle are what consume wasted energy from the engine, and if you put in a freer flowing intake, you'll just close the throttle a little more to get the same power and are right back where you started. In a system that mixes fuel with air by volume, as a carburetor does, a restrictive or dirty filter will cause the mixture to go rich and lower mileage. An engine control system that measures mass airflow and fine tunes the mixture with feedback from an exhaust oxygen sensor won't richen the mixture under those circumstances, and its mileage won't be affected. Only maximum power will be decreased due to limited maximum airflow. Pretty much the same applies to cold air intakes. Only thing they can help is maximum power at wide open throttle. Under some circumstances they may decrease engine efficiency and increase emissions, if the fuel's evaporation is delayed by the lower air temperature. Most of the time, with a warm engine, they'll make little difference.

04-14-2009, 02:58 PM	#13
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	Hey Brian, does .5 more displacement really do a big difference? I mean, my GTI only had 9 more hp than my Yaris. YarisHilton, I'm sorry, I kinda got lost in your post (doesn't help that I'm rushing here, I'm also studying for a test).

04-14-2009, 03:27 PM	#14
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	I just explained as simply as I know how that no air filter (or cold air intake) is going to boost your fuel economy. Any observed differences people report are coming from the well known effects of changing anything that you expect to make an improvement.

04-14-2009, 04:06 PM	#18
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	http://www.bobistheoilguy.com/index....d=58&Itemid=66 __________________ http://www.cardomain.com/ride/3210549

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