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Discussion Starter · #1 ·
So i recently installed the AP in to my 2008 JDM and it goes like the clappers so I`m impressed by that. That said, I`ve read some documentation and some forums and it seems that there is a lot of confusion over the octane rating in Japan. Some sites such as Shell say 100 octane but other say 96-98. My concern is that I will be killing my engine because I have the 100 octane map loaded when the fuel is not of a sufficient octane to support this aggressive level but i dont want to load the 93 octane map if the fuel is good enough to support a higher map.

Any assistance appreciated.
 

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In USA, we use Anti-Knock Index (Ron + Mon)/2. This is what is referred in Cobb. You need to figure out is your country is the octane rated by Research Octane Number (RON), Motor Octane Number (MON) or AKi. I believe Japan uses RON.
 

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Discussion Starter · #3 ·
In USA, we use Anti-Knock Index (Ron + Mon)/2. This is what is referred in Cobb. You need to figure out is your country is the octane rated by Research Octane Number (RON), Motor Octane Number (MON) or AKi. I believe Japan uses RON.
This is from a manufacturers site:
RONはResearch Octane Number - リサーチ・オクタン・ナンバーの略。一般的に用いられているオクタン価表示です。日本ではハイオクがRON: 100、レギュラーが91程度です。

Translation is: RON is Research Octane Number - stands for Research Octane Number. The octane number displayed in popular use. In Japan, a high-octane RON 100 is about 91 regular.

So looks like I am 2 RON short of the map that is for 102RON.

Now the question is am I likely to do damage with the 102RON map or should i use the 97 RON?
 

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Might be okay. I would use the 97 RON just to be safe because the boost might be too high for the octane rating. You don't want to detonate! Watch the knock sensor as check for boost spikes before getting on it too hard if you use the 102 RON. Should be okay though...
 
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