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Old 01-23-2007, 09:22 PM   #1
CALI07TR
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Default Can i use 97 octane on my 07 WRx tr ?

I was at a truck stop today washing my car and i noticed these 2 single pumps that said 97oct and 100 . i i use and of the high octane fules will it hurt my engine ? give me more power ? nothing ? . just wondering .
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Old 01-23-2007, 09:27 PM   #2
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sure your car will love it, it'll reduce the chances of knocking. Switching back to something lower after that might not be too good.
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Old 01-23-2007, 09:28 PM   #3
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are you sure it didn't have ethanol in it?
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Old 01-23-2007, 09:28 PM   #4
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They're both okay. The ECU should be able to take advantage of the increased octane to a point, but 100 is definitely overkill. Buying 93 and mixing in some 97 to get ~95-96 is probably your best bet. Beyond that you'd have to have a tune to take advantage of the higher octane.
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Old 01-23-2007, 09:44 PM   #5
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97 and 100 octane will make your car splode. It works on all non-tr WRX's tho. *chuckle* Noob-est question of all time.
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Old 01-23-2007, 09:56 PM   #6
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Quote:
Originally Posted by Whorebanger View Post
97 and 100 octane will make your car splode. It works on all non-tr WRX's tho. *chuckle* Noob-est question of all time.
Wrong. Higher octane makes you less prone to detonation/knock.

You just won't see any real benefit once you get pretty high without a tune.
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Old 01-23-2007, 09:57 PM   #7
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are you sure it didn't have ethanol in it?
i dunno didnt read all the signs , but when i go again ill check .
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Old 01-23-2007, 09:58 PM   #8
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Quote:
Originally Posted by bluestonepath View Post
Wrong. Higher octane makes you less prone to detonation/knock.

You just won't see any real benefit once you get pretty high without a tune.
ahh ok , just wanted to know if i would see any power increase or sumthing . thanx for the replies.
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Old 01-23-2007, 09:58 PM   #9
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Quote:
Originally Posted by CALI07TR View Post
i dunno didnt read all the signs , but when i go again ill check .
if it is E85, this might be of interest to you.

http://forums.nasioc.com/forums/showthread.php?t=803341
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Old 01-23-2007, 10:15 PM   #10
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if the car is not ethanol rated it will gum up the engine componets much like putting leaded fuel in ur car
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Old 01-23-2007, 10:16 PM   #11
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Quote:
Originally Posted by iownu86 View Post
if the car is not ethanol rated it will gum up the engine componets much like putting leaded fuel in ur car
http://forums.nasioc.com/forums/showthread.php?t=803341
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Old 01-23-2007, 10:18 PM   #12
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Quote:
Originally Posted by CALI07TR View Post
I was at a truck stop today washing my car and i noticed these 2 single pumps that said 97oct and 100 . i i use and of the high octane fules will it hurt my engine ? give me more power ? nothing ? . just wondering .
Just wondering, where was this at? State and City would be great. Also, how much were they?
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Old 01-23-2007, 10:20 PM   #13
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Quote:
Originally Posted by dexterous View Post
Just wondering, where was this at? State and City would be great.
I don't know if this is relevant to you're question, but here in Cincy, OH, there are a few marathons around that carry 100 octane E85, and I know of one locally owned marathon that carries 100 octane straight up unleaded.

-cw
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Old 01-23-2007, 10:23 PM   #14
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Whats the price difference between E85 100oct and normal 100oct?
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Old 01-23-2007, 11:32 PM   #15
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Quote:
Originally Posted by iownu86 View Post
if the car is not ethanol rated it will gum up the engine componets much like putting leaded fuel in ur car
....d0000000000d.....recent subaru's ARE rated for E10 as are ALL recently sold cars in the US.

READ those threads on 'E' fuels.


...and the car will LOVE 97 octane
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Old 01-23-2007, 11:37 PM   #16
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Quote:
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Whats the price difference between E85 100oct and normal 100oct?
E85 has 85% ethanol in it. For more info look at the link I posted.
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Old 01-24-2007, 12:21 AM   #17
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Quote:
Originally Posted by iownu86 View Post
if the car is not ethanol rated it will gum up the engine componets much like putting leaded fuel in ur car
wow.... hmm, where to start. leaded fuel doesn't 'gum' up your car. it destroys cats. and as someone else mentioned e10 fuel is fine, and LOTS of people run e85 with a tune and the right parts. (higher fueling capacity for the most part, bigger injectors and pump) Without those, you can run 30-40% depending on the rest of your setup before the injectors run out of trim on a wrx.
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Old 01-24-2007, 12:32 AM   #18
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it wouldn't hurt may help a little bit but the 100 octane is overkill and wasting your money without some kind of tune to go with it.


I live in florida and sunoco sells 100oct gas at the pump and has for quite some time now, it is regular gas not the E85 stuff either last time I went there it was almost 5 bucks a gallon but that was years ago.
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Old 01-24-2007, 04:01 AM   #19
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Quote:
Originally Posted by dexterous View Post
Whats the price difference between E85 100oct and normal 100oct?
Not sure how much normal 100 octane fuel costs, but E85 is 105 octane and I just paid $1.789/gallon for it this evening... And that's a bit pricey compared to other states.
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