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Highest Octane For Stock ECU??

Originally Posted by DEpointfive0 The US doesn't use Octane, we use AKI, average knock index. You cannot compare it to the rest of the world We do refer to octane,

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Old 11-21-2013, 12:58 AM   #1 (permalink)
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Originally Posted by DEpointfive0 View Post
The US doesn't use Octane, we use AKI, average knock index. You cannot compare it to the rest of the world
We do refer to octane, but it's rated a bit differently -- RON+MON/2 = AKI, whereas most of the rest of the world uses RON.

You can get a close approximation on RON vs AKI tho'; typically .95*RON = approximately equivalent AKI.

Example: The Z recommended octane is 91 AKI and 96 RON

96 RON*.95 = 91.2, very close to the AKI value.
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Old 11-21-2013, 01:07 AM   #2 (permalink)
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Originally Posted by Jordo! View Post
We do refer to octane, but it's rated a bit differently -- RON+MON/2 = AKI, whereas most of the rest of the world uses RON.

You can get a close approximation on RON vs AKI tho'; typically .95*RON = approximately equivalent AKI.

Example: The Z recommended octane is 91 AKI and 96 RON

96 RON*.95 = 91.2, very close to the AKI value.
Yeah, that's close.

If the RON is 100 in Japan, 95~ AKI

My money would be something like 94 on America's AKI system because that's probably the highest you CAN find at a normal pump in the US (I think I've seen 94 at the pump in Ohio, or Illinois, or Michigan)
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Old 11-21-2013, 09:37 AM   #3 (permalink)
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All this had to do with octane wars years ago (1970's ??). This ended once they settled on the RON+MON/2 = AKI formula.
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