Stock Hellcat Dyno Videos w/91 and 100 Octane

Discussion in 'Dodge Charger SRT Hellcat' started by Natasha Romanova, Oct 6, 2015.

  1. Natasha Romanova

    Natasha Romanova Rookie

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    Stock 2015 Hellcat. Dynojet dyno.
    First video is with 91 octane, 112 degree F temp



    626hp and 561 torque

    Second video is with 100 octane, 85 degree F temp. Higher humidity as well.



    691 hp and 616 torque (ignore 728 torque spike).

    Cooler temps definitely played a part in the hp gain on the second graph. I'll be going back in a week with 91 again for better comparative analysis.
     
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  2. Charger_Hellcat

    Charger_Hellcat Gold Member Hellcat Car Club Gold Supporting Member

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    Did you have to re-tune with higher Octane or does the ECU take care of it? We have 101 at the F1 track here in Austin, but I'm worried the car might not like it and need to be tuned. I thought about going half 101 and half 93. Your input would be greatly appreciated!!!
     
  3. hellcat1

    hellcat1 Gold Member

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    Is that an auto or Six Speed
     
  4. Natasha Romanova

    Natasha Romanova Rookie

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    As long as it's unleaded, the ECU should take care of it and you should pick up some HP.

    Six speed :)
     
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  5. Charger_Hellcat

    Charger_Hellcat Gold Member Hellcat Car Club Gold Supporting Member

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    Sweet!!
     
  6. Meowzer

    Meowzer Hellcat Member

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    I'll post next week's dyno up on here to compare 91 and 100 in the same weather/temps - I'm interested in seeing a better comparison of just the octane change. :)
    (This is the OP - I realized I was on an olllld account before, so I switched over)
     
  7. DShatzer

    DShatzer Gold Member

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    It would be interesting to see if 109 improves the numbers more. I know it takes $$$$ but finding the upper limits of the factory ECU tune based upon fuel quality would be interesting. Some manufacturers put upper bounds on their ECUs.
     
  8. Aarcuda

    Aarcuda Gold Member

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    good job! ill be interested in the results
     
  9. Confuzed2

    Confuzed2 Silver Member

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    I'd love to see those runs on the same day, same temp and humidity but with different octane gas! So you have the right idea! ... Interesting you picked up that much more power with the higher octane.
     
  10. beefcake

    beefcake Gold Member Hellcat Supporting Vendor

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    if the stoich of the fuel is about the same, car shouldn't run any leaner, car will simply add the max timing the factory computer will allow. i always put about 2.5 gallons of e85 in to a fill up for the octane and cylinder cooling effect. e85 will run leaner, but at that amount, the pcm should be able to compensate
     
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  11. currybob

    currybob Bob

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    me too
     
  12. DShatzer

    DShatzer Gold Member

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    Where did you get this info? Most premium is E-10, then adding two gallons of E-85 puts you nearly effectively E-20. Just curious. Enjoy your car!
     
  13. pussycat

    pussycat BANNED

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    Dude what u waiting for drop some stupid numbers on the hellcat like ya do wit other hemi"s
     
  14. Robo21

    Robo21 Gold Member

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    Wow! This is exactly the information I was looking for! I just found 100 octane race gas last night. I was wondering what kind of improvement I would see at 93.5 octane blending 100 with 91 octane. I guess you didn't try any blended you went with straight 100 octane from the looks of it. This is fascinating.
     
  15. TNCHARGER

    TNCHARGER SRT Hellcat Supporter Gold Supporting Member

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    Don't get too excited over this...dynos tend to lie and back 6 months ago when the OP did the dyno the temp was 27* hotter when he did the 91 octane compared to the 100 octane....heat will pull HP fast....plus others experience at the track (which is the accurate way to gauge HP) with race gas do not support a 65hp increase...
     

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