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Old 03-31-2006, 12:29 PM   #1
doug young
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Member#: 111319
Join Date: Mar 2006
Default air intake/ gas milage

hey guys, new guy here. i have a 1998 outback, stock. it has 182,000 +-. its a commutor car for my wife. i want to do some kind of air intake, but dont want to spend a ton of money if i dont have to. i would love to take advantage of the scoop in the hood if at all possible. so in short i want to improve gas milage. what can be done? is there anything i can do chip wise? dont really want to increase HP and get into bigger high flow exhaust etc. what about replacing engine "stuff" that has to do with ignition? is there any ignition "stuff" that needs to be replaced for maintenance other than spark plugs and wires and gas filter that should be replaced? any help is greatly appreciated. i know theres alot i want to do and i know i dont want to spend a ton of money...not sure if that is possible. let me know your thoughts... great site and glad to be here...cheers from the pacific nw
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Old 03-31-2006, 01:33 PM   #2
skunkfifty
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Member#: 73102
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: madtowne, WI
Vehicle:
1998 legacy outback
white

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you can do a snorkus removal and juet get a section of PVC pip and make a DIY intake. using the hood scoop takes a bit of fabrication because you need to integrate your air flow sensor, plus if you get rid of the air reserve box on top of the motor it will probably bog when you get on the gas, that box holds a reserve of air for when you put the pedal down fast. plus theres the issue of water getting in through the hood scoop, if you're using it as an air intake, that means water into your engine.

you listed pretty much all the ignition maintenance you'll need to do already. heres a spark plug tip: remove the air box, battery and washer fluid tank when you do it, dont even bother trying to work around them.

and an outback specific forum is subaruoutback.org which is currently having server issues
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Old 03-31-2006, 01:59 PM   #3
spdracr00
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Member#: 65823
Join Date: Jul 2004
Chapter/Region: NWIC
Location: Hillsboro, OR
Vehicle:
1996 Impreza L
Red

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Well, i picked up a used GP Moto Intake for my 99 and it did make my car louder, it did add a very little bit more power, but i did notice i got a few maybe 1 or 2 mpg. I also went with the NGK V-power plugs.. a lot of folks on the boards like them and they are cheap $1.50each so i thought i'd give them a try. But the biggest thing i did was swap out my exhaust for a more free flowing unit. over all with my intake and exhaust i think i get about 2 or 3 mpg better. but I dont always keep my foot outa the gas cause i like the way my car revs. I also noticed if i use a higher grade of gas my mpg's went up as well. I think it was due to the engine having to work less. oh yeah.. there is always engine managment. The PP6 (perfect power) that rallitek.com offers proven gains. Our cars run rich..... so with this piggyback unit you get 12whp(wheel horse power) and a 2-3mpg increase. these are posted dyno results off their site. not bad for $500 installed. so when i get that installed later in the year (yay tax refund) i'll be looking at prob a 14hp gain and a 3-5mpg increase.. for around $800 of parts. so is it worth it? who knows, but every little bit helps.
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Old 03-31-2006, 03:38 PM   #4
skunkfifty
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Join Date: Oct 2004
Chapter/Region: MWSOC
Location: madtowne, WI
Vehicle:
1998 legacy outback
white

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the cheapest thing you can do to improve milage is keep your tires inflated and keep your foot off the floor, also be sure to use the oil weight subaru says to use, or at least nothing heavier.

if your wife doesnt like the idea of a louder car due to intake and exhaust just go for engine management, from rallitek. if its a daily driver and shes not gonna do any "spirited" driving then any performance gains are pretty much a waste.

the higher grade gas thing is iffy, on higher grade, my milage goes down about 1-2mpg, so that may or may not help. im assuming you want to raise the mpg to save cash at the pump, but if you spend more for gas, how are you saving money?

what kind of milage are you getting now and what kind of driving the car is doing? more highway than city? more city than highway? it could be you're already getting about the best milage you're gonna get out of the car, so calculate it and let us know!
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Old 03-31-2006, 05:10 PM   #5
doug young
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Member#: 111319
Join Date: Mar 2006
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she is mostly highway to and from work and then days off is around town. majority is highway. we used to get about 100 miles per quarter tank, now its about 60-70 miles per quarter tank. i think its about 25 mpg and less around town.
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Old 04-04-2006, 03:50 PM   #6
Plays_With_toys
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Member#: 82556
Join Date: Mar 2005
Location: Parker, Colorado
Vehicle:
1996 Legacy L wagon

Default

A cheap intake is the ebay intake. Its usually about $20 or so, and is just a larger, aluminum pipe. The filters included are junk, so just find one without a filter, and run it to your airbox. Over on www.sl-i.net I wrote up an install guide. I'd get you the link, but I'm typing this right before my class, so I don't have to time to look for it, but its an easy install. It changed the low end of my car, but at the high end it seems the engine gets breathless. For gas mileage, I went from 24-25mpg to 30mpg highway. I switched plugs, plug wires, fuel filter, and air filter. With my exhaust and intake, I improved about 4 mpg, but I think my mpg ratings are off because my tire/wheel combo is taller than stock tires (when i was getting that mileage). Having said that, I have a 2.2 liter, so I might be able to get better gas mileage simply because of the displacement difference. Good luck with your quest.
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