Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Gear Ratio Questions


  • Please log in to reply
5 replies to this topic

#1 SuperSubaru

SuperSubaru

    USMB Regular

  • Members
  • PipPipPip
  • 34 posts
  • Rockford, IL

Posted 21 February 2006 - 01:55 PM

I am trying to squeeze a few more MPG out of my 97 Legacy Outback. Stock differentials are 4.11 gears, and I believe there is an available 3.70 gears from other applications of different years. Does anybody know if this is possible? Do you know what applications carried those 3.70 gears? FHI p/n is 722011001.

Maybe I could find a loaner car, from the dealer, they want like $2400.

#2 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 31 October 2006 - 08:31 AM

I am trying to squeeze a few more MPG out of my 97 Legacy Outback. Stock differentials are 4.11 gears, and I believe there is an available 3.70 gears from other applications of different years. Does anybody know if this is possible? Do you know what applications carried those 3.70 gears? FHI p/n is 722011001.

Maybe I could find a loaner car, from the dealer, they want like $2400.


Just saw this. It was attached to the 'welcome' thread.

No wonder it never got any replies.

You get this handled?

#3 suberdave

suberdave

    www.suberdave.com

  • Members
  • 1,001 posts
  • Covington

Posted 31 October 2006 - 09:31 AM

I am trying to squeeze a few more MPG out of my 97 Legacy Outback. Stock differentials are 4.11 gears, and I believe there is an available 3.70 gears from other applications of different years. Does anybody know if this is possible? Do you know what applications carried those 3.70 gears? FHI p/n is 722011001.

Maybe I could find a loaner car, from the dealer, they want like $2400.


sounds like a lot of work for "a few more MPG" and you can buy a lot of gas for $2400. like a 1000 gallons. thats good for 25000-30000 miles.

just my $0.02

-=Suberdave=-
www.suberdave.com

#4 BruceyWV

BruceyWV

    Subaru Fanatic!

  • Members
  • 360 posts
  • 39.658193 -79.964263

Posted 31 October 2006 - 11:56 AM

If you want to modify something other than the sake of modifying it, good.
But those gears might not even be that beneficial, espaically at that price.

Longer gears dont necesarily mean better mpg. With the lack of torque you'll have to rev the engine even more than normal to keep you moving.

For 2400$, buy a 1000$ CRX or something and get 45 mpg on gasoline.

#5 Numbchux

Numbchux

    EJ conversion addict

  • Members
  • 5,991 posts
  • Duluth, MN

Posted 31 October 2006 - 03:59 PM

as Brucey mentioned, talller gears aren't necessarily the answer. but I thought I'd elaborate...

lifted EA82 wagon, if I try to use 5th gear, I have to use so much more throttle, that the gas mileage goes down by almost 10 mpg! cruising at ~4k rpm in 4th gear is WAY more effecient.


also, keep in mind that in order to change your final gear ratio, you have to change the rear diff AND the transmission (or have it regeared :eek: )

it's a bigger job than most cars

#6 x1/9

x1/9

    USMB Regular

  • Members
  • PipPipPip
  • 47 posts
  • South of Adelaide

Posted 31 October 2006 - 06:50 PM

Install a vacuum gauge and make sure it always reads as much vacuum as possible :grin: ofcorse that will slow you down a little, but it will really help with economy.

I found that while crusing at 100kph (60mph approx) I was getting about 5Hg then I let my foot off a little and managed to get a constant 8Hg of vacuum, now I keep a good eye on the gauge to make sure I'm not wasting fuel.

I don't think changing the diffs will help too much and like the other guys said, the money is probably better spent on something else, like a new air filter, oil filter, oil, tune up, spark plugs and so on, all those things might get you even better economy.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users