QUOTE(xandras @ Oct 31 2011, 01:59 PM)
I hope we're on the same page and the same topic here, but I can't quite understand your theory.
The reason why an ECU retards the timing when knocking is present in a low octane combustion is to prevent damage to the engine internals. Delaying the timing by a full day could possibly damage the engine, the most crucial parts being the pistons. As such, the knock sensor detects knocking and the ECU retards the timing almost immediately to prevent further damage. A bad knocking/air pocket detonations can punch a hole through the piston, rendering the whole engine useless.
Output is not the same if you're running RON 95 on a car that requires RON 97 for full performance. Get 2 separate dyno charts on a same performance car (preferably Civic FD Type-R, as it is NA) running on 2 different RONs of petrol, and you will see the difference in the powerband, peak HP & torque.
In Malaysia still can find RON 92?

Added on October 31, 2011, 2:12 pmAnd you're driving...? Saga? A good AFR should be a balance of FC & power, which translates to around 14.5:1.
yes, we are on the same page, what i mean, although you dont increase the compression ratio of the engine, there is still some benefits from higher octane fuel, where higher octane fuel can tolerate more advance ignition timing. by this way, you are making abit more power in the low rev on a stock engine. not much though
sorry i dont really mean delaying the timing for a full day, but it takes few kms before you actually feel power from higher octance fuel. from my last higher compression engine (11:1), i did pump ron95, and can hear pinging, but i didnt blow yet, drove it a day, then switched to ron97, i still felt power loss, but next day, the car has no more pinging and the car has more power.
This post has been edited by xshiro: Oct 31 2011, 03:06 PM