Fuel octane rating and AFR query - Mitsubishi Lancer Register Forum

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Old 12-08-2019, 22:02   #1
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Fuel octane rating and AFR query

Hi All

Wondering if you could shed light and help with understanding

So let's say we are using shell v power 99ron and at WOT we have an AFR of say 11.0 - 1

Now if we were to use say regular unleaded 95ron would this lean out the AFR due to lower octane rating as sat in the same scenario be perhaps 11.3 - 1 at WOT ?

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Old 13-08-2019, 06:20   #2
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Different octane level won't make the car richer or leaner. Energy density (and additives) will. If you use different octane level, you can play with timing, but this won't drastically change your afr.
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