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Old 09-28-2004, 02:33 PM   #1
rsti02
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Default Octane ?

Will it hurt my Suby 02' 2.5rs if i run 87 octane on a trip? I currently run 92 octane while in city. Any help will be appreciated
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Old 09-28-2004, 02:34 PM   #2
rsti02
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O yea it will be a trip from omaha ne to denver co
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Old 09-28-2004, 02:36 PM   #3
soso3
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Why would it hurt? Isn't the minimum recommend octane 87?
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Old 09-28-2004, 02:36 PM   #4
dmatthew
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Isn't the recommended octane 87 for our RS'? I was told that since our cars are non-turbo ones you don't really need to run the highest octane.

The 87 is from the manual I believe. Then again if you did any mods to your car it might be a different case!
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Old 09-28-2004, 05:35 PM   #5
bartx
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unless your subie is heavly modded, you should be fine. i have never had a problem switching to ****ty gas when needed, but my friend(who has a stage 4+ wrx) does. he usally puts 93 in it, and on the way from stl to denver in KS we can only find 91. when that is the case the damn thing will not idel. but my 04 rs. with an CAI and Cat back donesn't even get nock. i think you should be fine, good luck.
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Old 09-28-2004, 05:39 PM   #6
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I wouldnt run 92 ever. The car is supposed to be run on 87, and you will get the most from your car by running it on 87. By putting in 92 you are wasting money as well as hurting your performance. Unless you are turbo'd or tuned for a different octane rating you should always be using 87.
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Old 09-28-2004, 05:41 PM   #7
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I ran 87 octane in my RS all it's life, except on trips to Colorado. Nebraska only goes down to 89. Colorado has 85, and my parents use that in their Forester with no problem, but the last time I put it in my car my front O2 sensor coincidentally failed. I can't prove it had anything to do with it, but wherever I go, I try to stick to the same gas.

You can probably do Omaha to Denver in a day; just watch for cops on I76 in CO. I've never seen so much as a speed trap in Neb.

And there's no reason to be giving a normal RS 92 octane. Run it till it's on E, put in 87 (or nine, or whatever you get out there) and reset the ECU just to keep it from having issues.
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Old 09-28-2004, 06:22 PM   #8
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Quote:
Originally Posted by Yotsuya
I ran 87 octane in my RS all it's life, except on trips to Colorado. Nebraska only goes down to 89. Colorado has 85, and my parents use that in their Forester with no problem, but the last time I put it in my car my front O2 sensor coincidentally failed. I can't prove it had anything to do with it, but wherever I go, I try to stick to the same gas.

You can probably do Omaha to Denver in a day; just watch for cops on I76 in CO. I've never seen so much as a speed trap in Neb.

And there's no reason to be giving a normal RS 92 octane. Run it till it's on E, put in 87 (or nine, or whatever you get out there) and reset the ECU just to keep it from having issues.
You can crusie through Nebraska at ~90, I cruised down 76 at that speed too, but I had a radar detector, although I didnt even pick up a single cop.
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Old 09-28-2004, 06:55 PM   #9
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and why would 92 octane make it necessary to reset the ecu? i got 2.5" exhaust, cobb cai, cobb headers, street cams, and lightweight crank pulley, when run on 92 octane, my suby sounds very happy
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Old 09-29-2004, 05:53 PM   #10
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Quote:
Originally Posted by rsti02
and why would 92 octane make it necessary to reset the ecu? i got 2.5" exhaust, cobb cai, cobb headers, street cams, and lightweight crank pulley, when run on 92 octane, my suby sounds very happy
Not reset, but reflash with a tune. The car is designed to run on 87, it runs better on 87 and you are just wasting your money on 92. Ive been running 87 in my car ever since it was new and I have no problems at all. If you want to continue wasting your money go for it.
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