Japan only uses the RON method, giving higher results. Its the same octane rating, just a different number.The pump octane is also referred to as the Anti-Knock Index (AKI). AKI is determined based on an average of the Research Octane Number (RON) and the Motor Octane Number (MON). The formula is RON+MON/2 normally abbreviated as R+M/2 on the pump.
The MON is a measure of the gasoline's ability to resist knock under sever operating conditions. MON affects high speed, part throttle and performance (under load such as in passing). The RON on the other hand, is a measure of gasoline's ability to resist knock under less severe conditions. RON affects low to medium speed knock and engine run-on (dieseling). For a given AKI, RON is typically 8-10 points higher than the MON. As an example, 87 AKI (pump octane) fuel would have a MON of 82 and a RON of 92.
Freaking Typo! (.2 would not make much of a diff anyway) My bad.4bidden said:Wild speculation, where did that come from?
Your facts are wrong also....the difference in CR is .6, not .2.
Better double check next time before you start calling us HT'rs.
The orignal ECU from my Si motor said 2W on the side.ScottH23 said:2. The pic 4bidden posted said "JDM P13 /4W STEERING" under the JDM ecu and the "4W" on the sticker of on my ECU would hint at 4 wheel steering even if it's not what it's there for.