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I cannot comment on boosted but all the NA tunes i have seen for these cars target low12 at leanest and most dipping into 11 at max rpm for knock resistance on our 98 ron fuels which are far inferior to usa 93 fuels and often not even as good as 91 usa.
If i go any leaner you have to remove wads of advance and loose power
Quality an composition of you fuel is going to make a difference.
On E85 can run around mid 12 afr (adjusted to petrol afr scale) at high rpm.and about 10 degrees more anvance than 98 ron
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