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98 octane for mazda 3 2.0L G-165

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Old Apr 19, 2016 | 01:50 AM
  #1  
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Default 98 octane for mazda 3 2.0L G-165

Hi
I decided to give the 98 octane a try in my 2014 mazda 3 2.0L 165hp.
I can tell you that at the beginning i felt something strange, as if a little different sound from the engine but not more power.
Let me say that i only filled it 2/3 of the tank with 98 octan(by the way the minimum octane stated for this engine is 95 which is equal to 90-91 in the US).
I started playing with the car with full throttle & high rpm for few days & the car now runs better, i wonder if it will run even better with my next full 98 octane refuelling as for the last time it was mixed with 95 octane.
I'm not imagining it's better now especially between 3000-6700 RPM.
I'm sure now that the ECU is adapting to the higher octane & with 1:14 comp ratio it doesn't surprise me.
 

Last edited by Zoomazda; Apr 19, 2016 at 01:54 AM.
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Old Apr 19, 2016 | 04:06 AM
  #2  
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From: southern New Hampshire
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Originally Posted by Zoomazda
Hi
I decided to give the 98 octane a try in my 2014 mazda 3 2.0L 165hp.
I can tell you that at the beginning i felt something strange, as if a little different sound from the engine but not more power.
Let me say that i only filled it 2/3 of the tank with 98 octan(by the way the minimum octane stated for this engine is 95 which is equal to 90-91 in the US).
I started playing with the car with full throttle & high rpm for few days & the car now runs better, i wonder if it will run even better with my next full 98 octane refuelling as for the last time it was mixed with 95 octane.
I'm not imagining it's better now especially between 3000-6700 RPM.
I'm sure now that the ECU is adapting to the higher octane & with 1:14 comp ratio it doesn't surprise me.
Your 1998 has a 14:1 compression ratio? I kind of doubt it; I also doubt your engine is producing any extra power.
 
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Old Apr 19, 2016 | 04:10 AM
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Originally Posted by shipo
Your 1998 has a 14:1 compression ratio? I kind of doubt it; I also doubt your engine is producing any extra power.
This is 2014 2.0 skyactiv with 1:14 comp ratio for a fact, you can Google it & there is an extra power with 98 octane.
 
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Old Apr 19, 2016 | 08:03 AM
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Ahhh, that makes more sense; yes, as I understand it, not only does your Skyactiv motor have a 14:1 compression ratio, but you are *supposed* to use Premium fuel for best performance.
 
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Old Jun 10, 2016 | 02:12 AM
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Default Skyactiv ECU can adapt to fuel octane for 100%

Hi
So, I'm using 98 octan + VP octanium(total of 104 octane) for 2 months now on my Automatic 2.0L mazda 3 G 165 (1:14) & the car runs much much better, in 1st gear the weels are spinning crazy with an additional spin in second gear, if i want a good start acceleration i must do it on manual mode otherwise the car will shift to second gear at low RPM as a result of the spinning weels.
I know i know it sounds crazy but for a fact the car runs now great, i had the chance 2 weeks ago to race it a couple of times VS same car as mine & the differences were noticeable.
It took some time to adapt but this specific engine with 1:14 ratio loves high octane.
 

Last edited by Zoomazda; Jun 10, 2016 at 11:31 AM.
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