So how much of a difference does this actually make? - Page 2
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This is a discussion on So how much of a difference does this actually make? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by ZXNasty Well first off you will need to be tuned for it. So don't run to the ...

  1. #16
    Bond, James Bond McBill's Avatar
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    Quote Originally Posted by ZXNasty View Post
    Well first off you will need to be tuned for it. So don't run to the station and put in E85
    haha come on now, I know that. Just wondering how much of a difference, when tuning time comes, tuning on E85 makes...
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    Bond, James Bond McBill's Avatar
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    Quote Originally Posted by 11blackSTi View Post
    It makes a big difference. You can't just put it in the tank though. You need larger injectors.
    and what is necessary when tuning on E85 helps too.
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    MAINEiac 11blackSTi's Avatar
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    Quote Originally Posted by McBill View Post
    and what is necessary when tuning on E85 helps too.
    Dig into some of the build threads on here. There are quite a few people running E85 builds. You can check out what they have done.

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    Registered User ZXNasty's Avatar
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    Quote Originally Posted by McBill View Post
    haha come on now, I know that. Just wondering how much of a difference, when tuning time comes, tuning on E85 makes...
    Haha just making sure

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    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by McBill View Post
    how much of a difference does tuning on E85 make? as opposed to 93

    Depending on your other mods, about +50whp/+70wtq.. and a good 200rpm (or more) improvement in spool.

  8. #22
    Gold Member lokey's Avatar
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    Did someone say E85?
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    On a stock WRX or STI you can safely run 87 octane fuel. If there is any knocking the boost and timing will be cut back to keep the engine safe. You will likely see less power and perhaps less milage but you are very unlikely to have any engine damage from 87 octane fuel.
    Once the engine is tuned, you do not want to run lower octane then what you are tuned for. The management sensors on the WRX are not very advanced compared to what is being used by GM, Ford and just about everyone else. So if your tuned for 93 octane and running higher the stock boost, 87 octane can cause knocking and the ECU will not be able to correct for it in time to prevent possible engine damage.

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    Resident Jackass ShiftingLanes's Avatar
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    Quote Originally Posted by Mf645 View Post
    On a stock WRX or STI you can safely run 87 octane fuel. If there is any knocking the boost and timing will be cut back to keep the engine safe. You will likely see less power and perhaps less milage but you are very unlikely to have any engine damage from 87 octane fuel.
    Once the engine is tuned, you do not want to run lower octane then what you are tuned for. The management sensors on the WRX are not very advanced compared to what is being used by GM, Ford and just about everyone else. So if your tuned for 93 octane and running higher the stock boost, 87 octane can cause knocking and the ECU will not be able to correct for it in time to prevent possible engine damage.
    OP take this with a grain of salt. The manual explicitly states to run 91 octane at the minimum. The stock tune is NOT tuned for 87 and could cause engine issues. It is tuned for 91. And yes, running 87 on a 91 tune CAN cause engine failure. For example, at WOT you run a higher risk of engine blowup because the ratios of compression and detonation are different than the tune. Knocking can also lead to unnecessary engine wear or problems when a higher octane would have prevented it in the first place.

    "Safely run 87" is incorrect. Follow the manual.




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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    People don't read their owners manuals? This is news.
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  12. #26
    Resident Jackass ShiftingLanes's Avatar
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    Quote Originally Posted by Drews View Post
    People don't read their owners manuals? This is news.
    BLASPHEMY!!!




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  13. #27
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    omg wtf is wrong with people on here nowadays?!

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    Actually, I find manuals entertaining. And then there is the occasional "aha"-moment. Like when my windshield washer pump wouldn't work - because I didn't remember which way to use the combination switch (for lack of better word, the one on the right side of the steering wheel)...
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    Registered User olenderc's Avatar
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    My guess is you should familiarize yourself with the manual and your car first. I mean you've been running 87 octane on a car that clearly requires 91 at a minimum (93 optimally). Before you do anymore damage to your car, learn the car. I wouldn't worry about E85 or tuning whatsoever if you haven't even mastered the basics of opening up your car manual to see what fuel you should be putting into your tank.

  16. #30
    Registered User xFalleNx's Avatar
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    Quote Originally Posted by olenderc View Post
    I wouldn't worry about E85 or tuning whatsoever if you haven't even mastered the basics of opening up your car manual to see what fuel you should be putting into your tank.

    I like this bro.
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