GAS - High Octane Truth or Myth? - Page 6
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This is a discussion on GAS - High Octane Truth or Myth? within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; Originally Posted by zore Doesn't mean it's on it's death throws either You may have missed my post above as ...

  1. #76
    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by zore View Post
    Doesn't mean it's on it's death throws either
    You may have missed my post above as I took too long to write it - have a look.

    I am actually not in for an argument, just trying to look out for your interests. Do you have a boost gauge? Either way I'd recommend that you run the vacuum line from your compressor housing directly to your wastegate actuator if you want to keep running low reg. - it will keep you from ever boosting over ~8psi.
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    Quote Originally Posted by mycologist View Post
    You may have missed my post above as I took too long to write it - have a look.

    I am actually not in for an argument, just trying to look out for your interests. Do you have a boost gauge? Either way I'd recommend that you run the vacuum line from your compressor housing directly to your wastegate actuator if you want to keep running low reg. - it will keep you from ever boosting over ~8psi.

    Boost gauge is the only mod i've done to the car. And thanks for the info. It's nice when people can post information with out being insulting. I appreciate it. I do run super in the car, just not generally when I'm commuting.

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    Quote Originally Posted by zore View Post
    Boost gauge is the only mod i've done to the car. And thanks for the info. It's nice when people can post information with out being insulting. I appreciate it.
    No problem - if you keep doing this let us know how it goes. We'll try to keep you from getting completely roasted when you do.
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    Quote Originally Posted by zore View Post
    Where would you like me to pull these data logs from and with what? As far as I can tell, the high mileage is really all I need.
    I am very curious on the condition of your engine. Where are you located? I sure people here would be glad to take 5 mins out of their day to pull some data off your ECU.
    I'm in SoCal, by the way. Vag-com style Tactrix cable ready to read your ECU man.

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    I just think of it like this...Subaru service departments will tell you that the water pump isn't known for failures. But would you replace it while you are getting the timing belt done? Yes...because why spend $700+ to basically have a timing belt service done AGAIN if it does fail?

    What happens if you end up grenading your engine cause if finally couldn't handle one more knock situation? Was saving those $3 and $4 during each fill-up worth it then at that point when you now have to drop $4000 to have a new short block put in?
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    would running anything over regular 87 be sufficient? All we have here is 89 and 91 other then regular.

    Id also like to point out that in the second post on this thread the member said they put in octane booster to cure any issues when having to use regular. Dumping in a bottle of 104 octane booster will not raise your actual octane level more then maybe .5 of a point. Maybe enough to prevent further knocking but there is a big misconception about octane booster and how much it actually raises your octane level
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  9. #83
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    I'm fairly certain, without looking, that the octane recommendation is 91. 89 would still have the ecu compensating for knock.
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    inside of my cap says PREMIUM FUEL ONLY but does not specify what grade they consider to be premium fuel
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  11. #85
    and the Funky Bunch Calvinball's Avatar
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    I believe when I glanced through the manual it said 91, but I may be wrong.
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    I'll have to look in mine. My salesman also said I could get away with 89 in the winter months but should use 91 in the warmer summer months. I just wish they still had 93 up here.
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  13. #87
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    91 is premium in the US because 93 is entirely unavailable in several large population centers. You will be fine with 91.
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  14. #88
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    Quote Originally Posted by Venom351R View Post
    I'll have to look in mine. My salesman also said I could get away with 89 in the winter months but should use 91 in the warmer summer months. I just wish they still had 93 up here.
    Hmm...from what I know about what octane rating is and how it impacts an IC engine, I don't understand why the ambient temp would have any impact.
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    just about every place except Maine has 93 in the north east. I can drive 30 mins across the boarder to NH and find it everywhere. It switched from 93 to 91 after the first gas spike of $4 gas. Ive been hearing rumors of a few stations that have started to carry 93 again but I have yet to see it
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    Quote Originally Posted by Calvinball View Post
    Hmm...from what I know about what octane rating is and how it impacts an IC engine, I don't understand why the ambient temp would have any impact.
    Actually, I've read that somewhere too, a few years back. The higher the ambient temp the more voitile gas becomes since something about fire just being heat and higher ambient=lower heat necessary to ignite.
    Again, something I read years ago.

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