100 Octane Unleaded: Yes or No?

Discussion in 'SRT Hellcat General Discussions' started by RobM, Dec 4, 2015.

  1. RobM

    RobM SRT Hellcat Lunatic!

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    This may have been addressed before but I couldn't easily find a thread on topic. I can buy 100 octane unleaded here in Vegas at several gas stations. It's pricey but...

    I have 2 questions:

    1. Will I see any performance gains? (I see gains when I put the 110 Rocket Fuel in my BB El Camino)

    2. Will using this gas burn out my cats or pop some engine codes?

    Any help on this would be appreciated. Thanks
     
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  2. CrewDoggie

    CrewDoggie Gold Member

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    My Dad has ran trick 101 in his and loved it. I haven't ran anything in mine yet. I'm still running fuel from the dealer when I picked mine up a couple of days ago
     
    Last edited: Dec 4, 2015
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  3. flanman

    flanman Silver Member

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    If the engine isn't built with the need for high octane, you are wasting your money. You won't see any performance gain and it can actually hurt performance because in general higher octane fuel is harder to burn.

    Your big block probably has higher compression and the higher octane helps.
     
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  4. CubeMan

    CubeMan Tri-State Overlord

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    If the engine produces any knock with 93 octane, then yes you would gain power with 100 octane because the higher octane should eliminate the knock. It could literally gain you 1hp or something that isn't even registered on the dyno though.


    aka not worth it.
     
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  5. im3cpo

    im3cpo Senior Hellcat Member

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    You could also monitor your car (via tuner) and if you do get knock at 93 octane, you could mix 100 octane to increase the overall octane until you see the knock stop. I used to have an excel spreadsheet you would enter in the size of your tank, the octane of the fuels you have, and what octane you want to run and it would tell you how many gallons to mix. If you need it, let me know and see if I can dig it up.
     
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  6. RobM

    RobM SRT Hellcat Lunatic!

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    I appreciate the offer and if I notice an issue, I'll message you. Right now I don't get a knock and performance is very good but all we have around here is 91 octane and no 93. That is why I was considering a blend of 91/100.

    Thanks again
     
  7. Catless

    Catless Silver Member

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    So you are datalogging your Cat and see no ST KNK retard? I see measurable ST KNK with 93 in cold weather. Wondering what it will do when the weather gets hot.
     
  8. Bubba871

    Bubba871 Silver Member

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  9. IEATZL1's

    IEATZL1's Gold Member

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    I have a gas station in South County here in STL that sells 102 octane. $6.99 a gallon. I use it quite bit. I do NOT notice anything dramatic with seat-of-the-pants feel. But it does scoot a little faster and it did knock 2 tenths off of 1/4 mile time.
     
  10. idmotorsports

    idmotorsports Hellcat Member Hellcat Supporting Vendor

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    You'll pick up some power with higher octane fuel. Make sure to use unleaded. Higher octane fuel burns slower and will definitely lower knock sensor activity, causing timing to creep up as the ECU learns.

    Like mentioned above, you won't notice anything SOTP. A couple tenths in the 1/4 max, which is tough to feel.
     
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  11. Aarcuda

    Aarcuda Gold Member

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    what he said!
     
  12. idmotorsports

    idmotorsports Hellcat Member Hellcat Supporting Vendor

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    Right, I've read that article too. It's dependent on the fuel you are speaking of. We are speaking of race fuel in the sense of a more volatile version. There's quite a few variety of fuel's these days, but we mostly deal with unleaded oxygenated race fuel. Q16 works well for a trip to the track for any forced induction.

    VP Drag Racing Fuels

    Thanks.
     
  13. flanman

    flanman Silver Member

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    To be clear about this, octane in and of itself will not make more power. It will only make more power if the engine needs the higher octane. It only allows the engine to make it's full power potential, no more.

    People mistakenly think that higher octane means more power, like it's nitrous or something.
     
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