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Old 03-14-2001, 12:54 AM   #1
ejicon
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Question Simple ???: What Mod Would Increase Gas Mileage?

I just wanted to know what mod would increase mileage for my 91 Legacy Turbo. I had a problem with the mileage awhile ago but sorta fixed it by putting in higher octane. I'm still not getting what I am suppose to. I'm averaging around 15 mile per gallon and 150 per tank. This really sux. I bough one of Larry's Filter Conversion kits: WIll this help? Also, isn't there something I should do after 140,000 miles to my turbo? Maybe the fuel isn't flowinf right because the Turbo is getting old? I dunno. Any help would be great.
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Old 03-14-2001, 06:24 AM   #2
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Find a local shop that has a MotorVac machine, it's worth the price to clean out your engine.

What they do is connect the machine inline by your fuel filter and mix fuel with a detergent while the car is idling. This cleans the inward fuel lines, fuel rails, injectors, valves, pistons, exhaust valves and might even clean the cat.

I think i paid $130 for it on mine, but i noticed an immediate difference in power once it was done. If you search the web, you can find a lot of good info on it.

An underdrive pulley might perhaps save gas, but probably not much.
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Old 03-14-2001, 07:46 AM   #3
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What about normal stuff?:

allignment,
tune ups,
proper tire pressure.

I have gotten better gas mileage in my wagon with Amsoil airfilter TS-74.

Roger
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Old 03-14-2001, 09:02 AM   #4
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Also change your fuel filter, if you haven't. They should be changed about every 15-20k.

Also switching to synthetic lubricants can gain you some mileage.
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Old 03-14-2001, 07:11 PM   #5
rrubel
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Simple! Lighten up on the right foot :-)

Seriously, some suggestions:
- if you raise the gas octane, for a quicker adjustment reset the ECU so it doesn't have to learn. Try going even higher - use 87 octane, but half a bottle of 104+ Octane Boost (yellow bottle, about $3 each, cheaper than running 93 gas but gives about 95 octane).

- underdrive pulley (already mentioned). Too early for definite results on my installation, but prelim seems to show a bit better mileage. Dale Teague showed 2-3 mpg improvement with his.

- synthetic oil and rear diff fluid.

- also, depending on where you live, we're experiencing the last of the winter oxygenated gas, which gives poorer mileage anyway.
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Old 03-14-2001, 08:31 PM   #6
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regular gas here is about 1.50, super is 1.70. that is a .20 difference. It would take 15 gallons to reach equilibrium with 104 booster.

I'd stick with premium.

Roger
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Old 03-15-2001, 12:34 AM   #7
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Unhappy

So do the 87 octane and 104 booster or just stick with 92.. WOuld it matter if I go back to 87.. I dunno.. I'm spending WAY too much money on gas... 150 miles to the tank is tragic... If I'm getting crappy MPG's now, why not just save myself 20 cents a gallon and swich to 87. No? Hmmm!!!

[This message has been edited by ejicon (edited March 15, 2001).]
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Old 03-15-2001, 12:45 AM   #8
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nice.. Thanks all..DLC.. I'll look into that Motor Vac Thing. It shouldn't be the air filter or the fuel filter. I just got a smog check and my car past with flying colors. If one of the two or both were bad, I would have failed the test in a minute. I don't know if it's the sparks.. I let my car running this afternoon for a good 20 minutes and it idled regularly. That vac treatment should do the work...

[This message has been edited by ejicon (edited March 14, 2001).]
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Old 03-15-2001, 06:16 AM   #9
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Why would you run such a low octane fuel in your turbo? Premium Unleaded is recommended in the manual and everything else i can find on the turbos. You might not have problems, but why risk it?

I really doubt it's the fuel itself, it sounds like something in the system is mucked up.
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Old 03-15-2001, 07:48 AM   #10
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hey... actually u know what?

when i installed my intake, i got much better gas mileage...
no.. really i did... dont ask me why... that's for a tech head to explain... hehehee

j. www.subiegal.com
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Old 03-15-2001, 09:00 AM   #11
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An intake should gain you some mileage. The engine can get more air more quickly, so it runs more efficiently, and burns less fuel. However, that only holds true if you can resist the urge to keep your foot out of the accelerator .

As for the octane thing, running too low will cause your ecu to retard your timing to prevent detonation. A common misconception is that higher octane is more combustible. It is actually less combustible.

Also, don't use octane boosters unless you really have to. You get a lot of varnishing from the stabilizers.
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Old 03-15-2001, 09:36 AM   #12
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Intakes are nice and all, but remember, he's having these problems on a Turbo, not an NA 2.5.

I really wish there was a Turbo intake worth more than $25 in Home Depot plumbing parts and $3 in gas money (yes, i mean you JC Sports).
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Old 03-15-2001, 09:44 AM   #13
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I am going to put an Amsoil filter on my turbo Legacy. And synthetic fluids too.

Roger

Last edited by subarurabbit; 10-19-2004 at 10:37 PM.
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Old 03-15-2001, 03:09 PM   #14
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"regular gas here is about 1.50, super is 1.70. that is a .20 difference. It would take 15 gallons to reach equilibrium with 104 booster."

A bottle will do two tanks or 30 gallons. BTW - this particular brand *claims* to not leave deposits in the engine. It's mostly used by our local dragstrip jockeys.
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Old 03-15-2001, 09:26 PM   #15
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Smile

Yeah.. it's true... I shouldn't degrade my gas.. I guess I was feeling a little tipsy when I said that.. I'm gonna check out that motorvac thing, get an oil change and maybe change the sparks. I'm gonna install the intake after that...
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Old 03-15-2001, 09:48 PM   #16
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I agree our car drinks gas!! i get 225miles to a tank with some occasional fast driving.. which is a bit on the high side, considering that i use 92octane Shell Gold. But some have found that on highway, using 4th instead of 5th for cruising, they actually get better milage! i don't do much highway driving so i won't know.. 99% of my driving is in city in 4th or 3rd..
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Old 03-16-2001, 06:06 AM   #17
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Is the car a stick or an auto?

Roger
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Old 03-16-2001, 10:56 PM   #18
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Yeah.. you're right....
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Old 03-17-2001, 12:33 AM   #19
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Auto.....
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Old 03-17-2001, 12:45 AM   #20
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isn't the rating 18/23?

Roger
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