The Type of octane to use? - Page 2
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This is a discussion on The Type of octane to use? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by jeremydingeman Ill bet the guy was referring to using E85. Could be, but you need the proper ...

  1. #16
    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by jeremydingeman View Post
    Ill bet the guy was referring to using E85.


    Could be, but you need the proper fuel system mods and tune to run e85.

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    ohh okey i got you..
    Quote Originally Posted by MainFrame View Post
    Kind of. Knock is when the fuel mixture in the cylinder isn't igniting at the correct time. The factory knock sensor is basically a microphone installed in the block that listens for a particular frequency of sound associated with combustion. If the gasses in the chamber aren't combusting at the right time it can cause all kinds of damage.



    Engine knocking - Wikipedia, the free encyclopedia

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    it could be, i was half asleep when i read it... what exactly is E85?
    Quote Originally Posted by jeremydingeman View Post
    Ill bet the guy was referring to using E85.

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    Subaru Newb MainFrame's Avatar
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    It's a mixture of 85% ethanol and 15% gasoline, commonly referred to as "Flex Fuel". The regular gas you get at the pump normally contains around 8% ethanol these days.



    e85 is generally sold a good deal cheaper than gasoline, is becoming more and more available in the US (can be bought at the pump at many gas stations), and performs like a race fuel when properly tuned in a turbo charged engine. It burns considerably cooler and has a high octane rating. Due to the properties of ethanol a tune can be pushed pretty damn hard before you start seeing knock, if it ever knocks.

    Typical power gains for a WRX on e85 are +50whp and +70wtq, give or take 10hp..

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    Registered User nsibanez's Avatar
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    Quote Originally Posted by MainFrame View Post
    It's a mixture of 85% ethanol and 15% gasoline, commonly referred to as "Flex Fuel". The regular gas you get at the pump normally contains around 8% ethanol these days.



    e85 is generally sold a good deal cheaper than gasoline, is becoming more and more available in the US (can be bought at the pump at many gas stations), and performs like a race fuel when properly tuned in a turbo charged engine. It burns considerably cooler and has a high octane rating. Due to the properties of ethanol a tune can be pushed pretty damn hard before you start seeing knock, if it ever knocks.

    Typical power gains for a WRX on e85 are +50whp and +70wtq, give or take 10hp..
    Too bad the closest one isn't in my state -_-
    Isn't it made from corn in a way too? Or was that something different

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    Registered User starkall's Avatar
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    The Type of octane to use?

    Quote Originally Posted by Kevin Pedrosa View Post
    i was reading through ome threads and guy said he need 85 oct to run his wr sti.. i run 93-95 what's the difference i thought the high the better unless i misunderstood. help if you can..thanks
    He prob meant e85, as in ethanol.

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    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by nsibanez View Post
    Too bad the closest one isn't in my state -_-
    Isn't it made from corn in a way too? Or was that something different


    Yea, in the US we generally make it from corn. They've been running it for over a decade in Brazil where it's produced from sugar cane. One of the big complaints about it is that it supposedly takes more energy to derive it from corn than it contains, although I believe they have improved the process in recent years, and it's much easier and cost effective to use sugar cane.



    In case you didn't know, ethanol is the alcohol you get drunk off of. A bottle of Everclear is e100.

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    Registered User nsibanez's Avatar
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    hmm, anyone wanna start moonshining??
    For gas saving of course =]

    Maybe we should start looking into other energy sources such as this for our gas instead of electric diesel hybrids...I kind of like hearing the sound of my engine...and the sound of other cars before i cross the street and not getting t-boned

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    Registered User UEDan's Avatar
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    Quote Originally Posted by MainFrame View Post
    In case you didn't know, ethanol is the alcohol you get drunk off of. A bottle of Everclear is e100.
    I had a crazy thought of DIY e85 for us California members... then I remembered even Everclear is banned here =(
    Gas sucks here. No doubt about it

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    Registered User nsibanez's Avatar
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    Cali is strict with everything though

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    Brasil is my country mann lol... you can find ethanol everywhere ...its made from corn that why the corn price went up as an alternative to gas... but don't you have to make your car special to run e85?

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    Registered User nsibanez's Avatar
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    I assume it couldn't be too much
    I'm gonna start planting some corn in my yard and make myself some free gas

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    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by Kevin Pedrosa View Post
    but don't you have to make your car special to run e85?


    ethanol contains less energy than gasoline, and requires ~30% more fuel. Really, the only upgrades you need to do are a fuel system capable of injecting 30% more fuel.. so basically, larger injectors and a more capable fuel pump.

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    bad side of e85 it burns faster then gas so its more $$$
    Quote Originally Posted by MainFrame View Post
    ethanol contains less energy than gasoline, and requires ~30% more fuel. Really, the only upgrades you need to do are a fuel system capable of injecting 30% more fuel.. so basically, larger injectors and a more capable fuel pump.

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    Quote Originally Posted by Kevin Pedrosa View Post
    bad side of e85 it burns faster then gas so its more $$$

    Around here it's so much cheaper than gas that the cost/mile is almost identical.. I think it's actually a little cheaper to run e85.

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