Welcome to the North American Subaru Impreza Owners Club Friday April 18, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-17-2011, 10:25 PM   #1
averagebob
*** Banned ***
 
Member#: 267352
Join Date: Dec 2010
Chapter/Region: NESIC
Location: account deleted
Vehicle:
dlt account
plz

Default Gas mileage mods (yes I used search) 01 legacy

So what type of things can be done to increase gas mileage from the low 20's on a subaru legacy *or any subaru*

I have heard light weight flywheel (I do a lot of stop and go so this would help?) and light weight rims....

Any others? Engine mods included, links would be great to products. I have searched for subaru parts but come up with generic sites that are trash and only sell universal crap.


So right now I get about 25mpg when my Air sensor doesn't puke and throw a code (its in the shop now for head gasket and timing belt next week it gets a new sensor) and I would like to add to that MPG significantly. My thoughts are

Light weight pulley set including flywheel
Light weight rims (alloy?)
Better intake ????
Better exhaust?????

I know tune up obviously but I'm looking for a little more in-depth.
averagebob is offline   Reply With Quote
Old 01-17-2011, 10:29 PM   #2
Ohhey1
Scooby Newbie
 
Member#: 260297
Join Date: Oct 2010
Chapter/Region: NWIC
Location: Portland, OR
Vehicle:
2006 STI White
HTA Green Methanol

Default

The only thing on your list that will make a difference is lighter wheels and that will probably be so slight you won't notice it. In my opinion, too much money anyway. Buy a slower or lighter car. 25 mpg is good.
Ohhey1 is offline   Reply With Quote
Old 01-17-2011, 10:31 PM   #3
averagebob
*** Banned ***
 
Member#: 267352
Join Date: Dec 2010
Chapter/Region: NESIC
Location: account deleted
Vehicle:
dlt account
plz

Default

Quote:
Originally Posted by Ohhey1 View Post
The only thing on your list that will make a difference is lighter wheels and that will probably be so slight you won't notice it. In my opinion, too much money anyway. Buy a slower or lighter car. 25 mpg is good.

Speaking of slower car do these things have Governors?. . . . . . If so I haven't hit one yet

So nothing would really make that big a difference?
averagebob is offline   Reply With Quote
Old 01-18-2011, 02:10 AM   #4
auslyle
Scooby Newbie
 
Member#: 129737
Join Date: Oct 2006
Chapter/Region: NWIC
Location: Bend Oregon
Vehicle:
04 Sweet Impreza
silver

Default

Quote:
Originally Posted by averagebob View Post
Speaking of slower car do these things have Governors?. . . . . . If so I haven't hit one yet

So nothing would really make that big a difference?
you'll run out of power before you run out of gear no governors
auslyle is offline   Reply With Quote
Old 01-18-2011, 08:22 AM   #5
renyo
Scooby Newbie
 
Member#: 93577
Join Date: Aug 2005
Chapter/Region: MAIC
Location: Orlando, unfortunately
Vehicle:
98 Impreza

Default

I know my Impreza fuel cuts at around 112 (on the speedo at least).
renyo is offline   Reply With Quote
Old 01-18-2011, 11:35 AM   #6
averagebob
*** Banned ***
 
Member#: 267352
Join Date: Dec 2010
Chapter/Region: NESIC
Location: account deleted
Vehicle:
dlt account
plz

Default

Quote:
Originally Posted by auslyle View Post
you'll run out of power before you run out of gear no governors
Ahh i see....

So no real way to increase gas mileage, Loose weight is about the only thing that would make a difference I think other than the rims like the guy above stated.

How about aluminum under body panels to lower drag? Low drag body kits???

Just throwing ideas out there maybe someone that knows will come by?
averagebob is offline   Reply With Quote
Old 01-18-2011, 12:24 PM   #7
abgusaf
Scooby Specialist
 
Member#: 143122
Join Date: Mar 2007
Chapter/Region: International
Location: Across the pond
Vehicle:
07 WRB STi
in the werks

Default

I would just save the money on everything but a tune, I had an aggressive tune on my wrx putting down between 310 - 320hp at the wheels, and i averaged about 21mpg. Thats both highway and city getting on it pretty regularly.

I bet you could get in the high 20's maybe 30mpg with a good tune
abgusaf is offline   Reply With Quote
Old 01-18-2011, 12:37 PM   #8
JoshP
Scooby Specialist
 
Member#: 94350
Join Date: Aug 2005
Chapter/Region: NESIC
Location: S. Maine
Default

All those things you listed will help with fuel mileage, so long as you dont change your driving style. 89 octane fuel will also.
JoshP is offline   Reply With Quote
Old 01-18-2011, 02:35 PM   #9
GEE-OTTO
Scooby Specialist
 
Member#: 201277
Join Date: Jan 2009
Chapter/Region: MAIC
Location: Arlington VA
Vehicle:
2009 Legacy GT
OBP

Default

89 really? Why ?

A Light weight Fly wheel wont help you in low speed situations.
Lighter wheels maybe.
Engine mods for a Ej251 that will help: better air filter, keep ignition/fueling system fresh.
GEE-OTTO is offline   Reply With Quote
Old 01-18-2011, 05:01 PM   #10
renyo
Scooby Newbie
 
Member#: 93577
Join Date: Aug 2005
Chapter/Region: MAIC
Location: Orlando, unfortunately
Vehicle:
98 Impreza

Default

Quote:
Originally Posted by GEE-OTTO View Post
89 really? Why ?
I think the idea is that the ecu can run better timing.

Quote:
Originally Posted by GEE-OTTO View Post
A Light weight Fly wheel wont help you in low speed situations.
Why not? This will help the same way

Quote:
Originally Posted by GEE-OTTO View Post
Lighter wheels maybe.
will help.
renyo is offline   Reply With Quote
Old 01-19-2011, 11:31 PM   #11
Bluefoton
Scooby Specialist
 
Member#: 141373
Join Date: Feb 2007
Chapter/Region: E. Canada
Location: Quebec, QC
Vehicle:
2008 2.5i-hatch -
now with a HID retrofit

Default

Maintenance, and a brick under the gas pedal. The rest will hardly ever pay off.
Flywheel might help a little bit, take low-rolling resistance tires when you change them, overinflate them by a few Psi, drop some weight...
Bluefoton is offline   Reply With Quote
Old 01-20-2011, 01:25 AM   #12
formula91
Scooby Specialist
 
Member#: 102984
Join Date: Dec 2005
Chapter/Region: MWSOC
Location: Northbrook, IL
Vehicle:
2005 2.5RS 4EAT
Platinum Silver

Default

Oh trust me, 89 octane does pay off... for me at least in my 05.

The cars in those years tend to run more timing than they can ever achieve, thus a quick fix outside of reflashing the ECU which 01s cannot is 89 octane. The increase in gas mileage overcomes the increase in price in most cases. I've been measuring for about a year now. On 89 octane, I can get around 30-32 mpg during long road trips. Quite nice. I measure for miles traveled on odo vs amount of gas filled to the top.
formula91 is offline   Reply With Quote
Old 01-20-2011, 07:25 AM   #13
Bluefoton
Scooby Specialist
 
Member#: 141373
Join Date: Feb 2007
Chapter/Region: E. Canada
Location: Quebec, QC
Vehicle:
2008 2.5i-hatch -
now with a HID retrofit

Default

^ Very nice.... if I ever hit 30, I'm usualy doing an annual tribal rain dance, and that's with an anally maintained car. Now I'm hoping the increased mileage from new HGs will pay the repairs..evenually
Bluefoton is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New 08 2.5i - Advice on Better Gas Mileage Mods ericpratum Newbies & FAQs 27 05-28-2009 11:09 PM
intake mod and gas mileage? digidelia Factory 2.0L Turbo Powertrain 2 09-28-2002 01:20 AM
What mods will help gas mileage?? mike270 General Community 35 01-29-2002 07:01 PM
Simple ???: What Mod Would Increase Gas Mileage? ejicon Legacy Forum 19 03-17-2001 12:45 AM


All times are GMT -4. The time now is 02:46 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.