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This is a discussion on Fuel Octane Question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So 91 is more then suitable especially with the stock tune which is just dumping fuel into the engine. Thanks ...

  1. #16
    Registered User boone1186's Avatar
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    So 91 is more then suitable especially with the stock tune which is just dumping fuel into the engine. Thanks for the insight. Maybe fuel up with 93 if I plan on punking some teenagers driving their civics just to give me the extra edge!
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  3. #17
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by boone1186
    So 91 is more then suitable especially with the stock tune which is just dumping fuel into the engine. Thanks for the insight. Maybe fuel up with 93 if I plan on punking some teenagers driving their civics just to give me the extra edge!
    I would run 93, if available

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  4. #18
    Registered User Findus11's Avatar
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    You just have to remember that not all "93" is truly 93. Gas stations sometimes state this because the ethanol in the gas boosts the octane. My tuner for my 325 whp rig recommended that I actually run shell... He told me that he can run a bit more timing without knock with shell gas, since they have some of the best quality fuel.
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  5. #19
    Registered User Road glide's Avatar
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    Yeah all u can get up in Maine is 91 as well after they started adding eathnol. I have how ever used c-12 in my saab turbo before and there was a difference for sure!! C-12 is 108 octane.

  6. #20
    Registered User GarrettKoonsman's Avatar
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    Quote Originally Posted by Road glide View Post
    Yeah all u can get up in Maine is 91 as well after they started adding eathnol. I have how ever used c-12 in my saab turbo before and there was a difference for sure!! C-12 is 108 octane.
    were you tuned for that?
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  7. #21
    He simply abides. SD_GR's Avatar
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    C-12 contains Pb so it's unsuitable for any vehicle with a catcon (this includes the fastest and most expensive Subarus in the world). IMO it's completely unsuitable for any road car, and most developed nations agree with me.
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  8. #22
    Registered User GarrettKoonsman's Avatar
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    Quote Originally Posted by SD_GR View Post
    C-12 contains Pb so it's unsuitable for any vehicle with a catcon (this includes the fastest and most expensive Subarus in the world). IMO it's completely unsuitable for any road car, and most developed nations agree with me.
    Except a lot of us don't have any cats
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  9. #23
    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by GarrettKoonsman View Post
    Except a lot of us don't have any cats
    Sure, but running leaded fuel is IMO just not on. It's entirely unnecessary at this point, as there is ample power to be had with unleaded fuels etc. Your call though; just voicing a viewpoint.
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  10. #24
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Unless you're tuned for a higher minimum octane rating, using anything higher than the recommended (in almost all areas 91 is fine, especially those at higher altitudes) is a complete waste of money. I would recommend using the premium fuel grade at whatever local gas station you prefer, wherever you are. Going out of your way for higher grade fuel (than 91) is pointless, again unless you're specifically tuned for it.
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  11. #25
    Registered User Road glide's Avatar
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    No tune for it we drag race sleds in the winter and had a few gallons left and we won't use it the next year so I just burnt it up.

  12. #26
    Moderator Donkey's Avatar
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    Quote Originally Posted by SD_GR View Post
    Sure, but running leaded fuel is IMO just not on.
    Not to mention lead fuel kills O2 sensors.
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