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Originally Posted by CSI:86
The pinging is just detonation. Your ecu will detect this and pull timing thus reducing horsepower. I have accidentally filled up with 95RON/91AKI on a really early morning and redlined it to get to work quickly at almost every stoplight. On the drive home, it was pinging. So i drove gently and brought 2 bottles of octane booster and filled up with 98RON/93AKI. And the pinging was gone almost instantly after.
There should be a sign on the fuel cap that say something like "PREMIUM 98RON FUEL RECOMMENDED"
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Just detonation!!! Detonation is what melts pistons.
If you can hear it then it's outside the range of the knock sensors because they will detect it and adjust before you can hear it.
I'm surprised that 95RON made it pre-ignite because the book does say it can be used if 98 is unavailable but 98+ is what it's tuned for. 98 RON only on the filler cap, so I don't know how they can sell it in US states with only 91AKI available?
Be careful using octane booster. I think it can damage the catalytic converters?